Only for authorized service technician !
Service Manual Gas Wallhung Boiler
Logamax Plus GB062
GB062 - 14....GB062 - 24....
2017
/01_
PR
M-M
21_U
. Dem
ir
Content
Logamax Plus GB0622
Content
1 Safety precautions and symbols . . . . . . . . . . . . . . . 31 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Safety precautions . . . . . . . . . . . . . . . . . . . . . 3
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.2 Before commissioning . . . . . . . . . . . . . . . . . . 42.3 Switching the appliance on/off . . . . . . . . . . . . 42.4 Setting the maximum flow temperature . . . . . 52.5 Setting the DHW temperature . . . . . . . . . . . . 52.6 Setting summer mode . . . . . . . . . . . . . . . . . . 52.7 Short operating overview . . . . . . . . . . . . . . . . 62.8 Product Type Description . . . . . . . . . . . . . . . . 6
3 Service menu settings . . . . . . . . . . . . . . . . . . . . . . . . 73.1 Operating the service menu . . . . . . . . . . . . . . 73.2 Service functions overview . . . . . . . . . . . . . . . 83.2.1 Menu 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83.2.2 Menu 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123.2.3 Menu 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Fault finding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154.1 Explanations of faults table . . . . . . . . . . . . . 154.2 Fault group definition . . . . . . . . . . . . . . . . . . 154.3 Faults and possible remedy steps . . . . . . . . 174.4 Faults that are not shown on the display . . . 40
5 Electrical values, gas conversion and boiler layout 415.1 Sensor (NTC) Values . . . . . . . . . . . . . . . . . . 415.1.1 Domestic hot water temperature Sensor . . . 415.1.2 Central Heating Flow Temperature Sensor,
Storage Tank Temperature Sensor . . . . . . . 415.1.3 Outdoor Temperature Sensor (7.747.026.229)
415.2 Gas conversion steps . . . . . . . . . . . . . . . . . . 425.3 Condens 2500W / CerapurCompact . . . . . . 435.3.1 GB062-24K.... . . . . . . . . . . . . . . . . . . . . . . . 435.3.2 Electrical values . . . . . . . . . . . . . . . . . . . . . . 44
6 Inspection and maintanance . . . . . . . . . . . . . . . . . 466.1 Safety instructions for inspection and
maintenance . . . . . . . . . . . . . . . . . . . . . . . . 466.2 Check the heat exchanger . . . . . . . . . . . . . . 476.3 Check the electrodes and clean the heat
exchanger . . . . . . . . . . . . . . . . . . . . . . . . . . 476.4 Cleaning condensate trap . . . . . . . . . . . . . . 496.5 Check diaphragm (flue gas non-return device) in
the mixer unit . . . . . . . . . . . . . . . . . . . . . . . . 496.6 Checking the strainer in the cold water pipe 506.7 GB062..K.. (Combi) appliances: Check the plate
heat exchanger . . . . . . . . . . . . . . . . . . . . . . 50
6.8 Checking the expansion vessel . . . . . . . . . 506.9 Setting the heating system operating pressure
506.10 Removing automatic air vent valve . . . . . . . 516.11 Checking the gas valve . . . . . . . . . . . . . . . 516.12 Removing the gas valve . . . . . . . . . . . . . . . 516.13 Remove the heating pump . . . . . . . . . . . . . 526.14 Removing the motor of the 3-way valve . . . 526.15 Remove the heat exchanger . . . . . . . . . . . 52
7 Good to know . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 537.1 Integrated Weather Dependet Function (WDC) -
Heat curve . . . . . . . . . . . . . . . . . . . . . . . . . . 537.2 Boiler Frost protection . . . . . . . . . . . . . . . . 537.3 Air purging in central heating mode . . . . . . 537.4 Air Pressure Switch (APS) . . . . . . . . . . . . . 53
8 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 548.1 Mixing unit . . . . . . . . . . . . . . . . . . . . . . . . . 548.2 Resonator & Burner . . . . . . . . . . . . . . . . . . 548.3 Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . 558.4 Circulation Pump (ErP pump) . . . . . . . . . . . 56
1 Safety precautions and symbols
Logamax PLus GB062 3
1 Safety precautions and symbols1 Symbols
Signal words indicate the seriousness of the hazard in terms
of the consequences of not following the safety instructions.
• Caution indicates that minor damage to property could
result.
• Warning indicates that minor personal injury or serious
damage to property could result.
• Danger indicates that serious personal injury could
result. In particularly serious cases, lives could be at
risk.
Notes contain important information in cases where there is
no risk of personal injury or damage to property.
1.1 Safety precautions
If you smell gas
B Turn off gas service cook.
B Open windows.
B Do not operate any electrical switches.
B Extinguish any naked flames.
B Leave the building and telephone the gas company and
authorized dealer from an outside phone.
If you smell fumes from the appliance
B Switch off the appliance.
B Open windows and doors.
B Inform your heating engineer.
Fitting and Modifications
B Fitting of the appliance or many modifications to be appli-
ance may only be carried out by a compotent perEND.
B Flue systens must not be modified in any way.
B If the appliance has a type B.. flue system : Ventilation
openings in doors, windows and walls must not be sealed
or restricted. If draught-proof windows are installed, meas-
ures must be taken to ensure there is an adequate supply
of air to the appliance for combustion.
Inspection / Maintenance
B We recommend take out a to have the system regulary
serviced in order to ensure that it functions reliably and
safely.
B Only use original spare parts.
Combustible materials
B Do not store or use any combustible materials (paper, thin-
ners, paints etc.) in the vicinty of the appliance.
Combustion Air / Ambient Air
B Keep combustion air/ambient air free of corrosive sub-
stances (e. g. halogenated hydrocarbons which contain
chlorine or fluorine compounds). In this way corrosion can
be prevented.
Instructions to the customer
B Explain to the customer how the appliance works and how
to operate it.
B Advise the customer that he / she must not make any mod-
ifications to the appliance or carry out any repairs on it.
Safety instructions in this document are identi-
fied by a warning-triangle symbol and are print-
ed on a grey background.
Notes are identified by the symbol shown on
the left. They are bordered by horizontal lines
above and below the text.
2 Operation
Logamax Plus GB0624
2 Operation
Fig. 1 Hydraulic connections
1 Siphon (condensation) Drain hose
2 Heating flow valve (accessory)
3 Domecti hot water qoutlet
4 Gas valve (closed) (accessory)
5 Drain hose
6 Cold water valve (accessory)
7 Heating return valve (accessory)
8 Filling valve
2.1 Display
Fig. 2 Display
1 Burner operation
2 Fault display/standby mode display
3 Heating mode active
4 DHW heating active
5 Summer mode active
6 Service Mode
7 Temperature display (in °C)
2.2 Before commissioning
B Adjust pre-charge pressure of expansion vessel to static
head of the heating system.
B Open the automatic air vent valve (leave open).
B Open all system radiator valves.
B Open the cold water valve.
B Open the cold water valve and one hot water tap until
water flows out.
B Open the heating flow valve and heating return valve.
B Fill the heating system to 1 - 2 bar and close the fill valve.
B Bleed radiators.
B Top up heating system to pressure of 1 - 2 bar.
B Check that the gas type specified on the type plate
matches that of the gas supply.
2.3 Switching the appliance on/off
Switching on
B Start the appliance at the standby key.
The display shows the heating water flow temperature.
Switching off/ standby mode
B Shut down the appliance at the standby key.
Only the warning symbol continues to be displayed.
B If the appliance is to be switched off for a longer period of
time: observe correct frost protection procedures.
Fig. 3
0 010 005 789-001
321 4 5 6 7
NOTICE: Commissioning without water will
destroy the appliance.
B Only operate the appliance once it has been
filled with water.
2 Operation
Logamax PLus GB062 5
2.4 Setting the maximum flow temperature
The maximum flow temperature can be set between 40 °C and 82 °C. The current flow temperature is shown on the display.
B Keep pressing – until the symbol appears on the display.
B Press OK.
The set maximum flow temperature is displayed.
B Press + or – to set the required maximum flow temperature.
B Press OK to save the setting.
The display shows the current flow temperature.
You can find typical maximum flow temperatures in tab. 1.
When the burner is active in heating mode, the symbol
and the burner symbol appear on the display.
2.5 Setting the DHW temperature
The DHW temperature can be set between 35 °C and approx. 60 °C.
B Keep pressing – until the symbol appears on the display.
B Press OK.
The set DHW temperature is displayed.
B Press + or – to set the required DHW temperature.
B Press OK to save the setting.
The display shows the current flow temperature.
B When the burner is active in DHW mode, the symbol
and the burner symbol appear.
2.6 Setting summer mode
The heating circuit pump and consequently central heating
are switched off. The DHW and power supply for the heating
control unit and timer are retained.
To set summer mode:
B Keep pressing – until the symbol appears on the display.
B Press OK.
The set maximum flow temperature is displayed.
B Keep pressing – until ... appears on the display.
B Press OK to save the setting.
is permanently displayed.
Additional instructions are contained in the operating instruc-
tions for the heating programmer.
The appliance has an anti-seizing function
which prevents the heating circuit pump and the
3-way valve seizing up following long periods of
inactivity.
The anti-seizing function remains active during
standby mode.
When selecting . ., heating mode is disabled ( appears on the display, summer mode).
Flow temperature Sample application
. . ( symbol appears) Summer mode
Approx. 75 °C Radiator heating system
82 °C Convector heating system
Tab. 1 Maximum flow temperature
NOTICE: Heating system at risk through frost. In
summer mode, only the appliance is protected
against frost.
B Observe frost protection measures where
there is a risk of frost.
2 Operation
Logamax Plus GB0626
2.7 Short operating overview
Fig. 4 Short operating overview
2.8 Product Type Description
GB Wall mounted condensiing gas boiler062 Segmen 24 Nominal CH output in kW (14, 20, 24, ...kW) K Combi version D Booster for DHW (e.g. 28 kW) H Gas type (H = Natural Gas, L = LPG) V2 Version2 : Energie Saving Pump“IT” Country (e.g. Italy)
GB 062 - 24 K D H V2 IT
Tab. 2 Product type description
3 Service menu settings
Logamax PLus GB062 7
3 Service menu settings
3.1 Operating the service menu
The service menu enables the convenient adjustment and
checking of many appliance functions.
The service menu splits into three submenus:
• Menu 1, for setting level one service functions ( page 9)• Menu 2, for setting level two service functions (page 12)• Menu 3, for setting the appliance type and output
(page 14)
Selecting a service function
Calling up the service functions is different from one menu to
the next. For a description, see the beginning of each menu
overview.
B Calling up a menu:
– Menu 1 (‡page 8)– Menu 2 (‡ page 12)– Menu 3 (‡ page 14)
B Press + or – to scroll through the menu's service functions.
Making a setting
B Press OK to switch to the service function.
The value flashes on the display.
B Press + or – to set the required value.
Saving a setting
B Hold down OK until the selected service function appears
on the display.
Exiting the service function without saving settings
B Press standby.
The boiler returns to standard mode.
Restoring values to standard setting
To restore all values from service levels 1 and 2 to their
default settings:
B Select service function 2.8.E in the second service menu and save value 01. The appliance starts with the default setting.
If you do not press a key for 15 minutes, the
service menu will be closed automatically.
3 Service menu settings
Logamax Plus GB0628
3.2 Service functions overview
3.2.1 Menu 1
To call up a service function in this menu:
B Hold down “Back”, + and – at the same time until L.1 is shown on the display.
B Press OK to make settings in menu 1.
B Press + or – to scroll through the menu's service functions.
Service function Possible settings/display
1.A Maximum output for cental heat-
ing
Some gas supply utilities charge a basic rate based on output.
The output can be limited to the specific heat demand between the mini-
mum rated output and maximum rated output.
Default setting is the maximum rated output.
B Set the output in percent (%).
B Measure the gas flow rate and compare it with the information from
the setting tables. If they do not match, change the setting.
1.b Maximum output
(DHW)
The output can be limited to the specific heat demand between the mini-
mum rated output and maximum rated output.
Default setting is the maximum rated output for DHW.
B Set the DHW output in percent.
B Measure the gas flow rate and compare it with the information from
the setting tables. If they do not match, change the setting.
1.E Pump mode Pump mode (pump run while burner off)
0 = as mode 2, but automatic selectionof mode 4if outdoor sensor detected1 = off after pump overrun2 = depends on room thermostat
3 = depends on outdoor control
2.b Maximum flow temperature The maximum flow temperature can be set to between 30 °C and 82 °C.
Default setting : 82.
2.C Venting function The venting function can be activated after maintenance.
The following settings are possible:
• 00: Venting function off
• 01: Venting function is switched on and after completion automatically
reset to 00
• 02: Permanent on.
Default setting : 00.
Tab. 3 Menu 1
3 Service menu settings
Logamax PLus GB062 9
2.d Thermal disinfection of the DHW
cylinder (System boiler)
• 0: Switched off
• 1: Switched on
This service function activates the heating of the DHW cylinder to 75 °C.
B Implement thermal disinfection as described.
Thermal disinfection will not be displayed.
Thermal disinfection terminates after the water has been held at 75 °C for 35 minutes.
2.F Operation Mode volatile With this service function, you can temporarily change the appliance
operating mode.
The following settings are possible:
• 0: Standard operation; the appliance runs according to controller
specifications.
• 1: The appliance runs for 15 minutes at the set minimum output. After
15 minutes, the appliance switches to standard mode.
• 2: The appliance runs for 15 minutes at maximum output. After
15 minutes, the appliance switches to standard mode.
Default setting : 0.
2.J Central heating / Storage tank
alternating mode (system boiler)
Anternating mode for 10 minutes betweens both mode.
Setting range: 0 - 1
Default setting : 0 minutes.
3.A Automatic ant-cycle mode 0 : 0ff, 1 : on (installation with weather depanded controls)
Default setting : 0
3.b Time interval for starting and
stopping (anti-cycle) the burner
(in CH mode)
The time interval determines the minimum delay between the burner
stop and restart (only active, if 3.A = 0).
Setting range: 1 to 10 minutes.
Default setting : 3 minutes.
3.C Temperature differential forstopping and restarting the
burner (Hysterisis) (via CHNTC)
The temperature differential determines the level by which the flow tem-perature must drop below the set flow temperature before the drop is interpreted as a heat demand. Settings in 1 K steps are possible.
The temperature differential can be selected between 0 and 10 K.
Default setting : 5 K.
3.d Min output in CH/ tank mode (%) Setting range : 20 - 80
3.E The period activeting keep hot
function (comfort mode) (Combi
version)
Setting range: 20 - 60 minutes.
Default setting : 20 minutes.
3.F Domestic hot water standby
time after tapping during CH
mode (Combi version)
Heating mode is disabled for this period of time following DHW heating.Setting range: 0 - 30 minutes.
Default setting : 1 minutes.
Service function Possible settings/display
Tab. 3 Menu 1
3 Service menu settings
Logamax Plus GB06210
4.b max pre heat temperature for
comfort function (combi)
max DHW pre heat temperature for comfort function.
The following settings are possible:
• 40 … 65 ºC
Default setting : 62 º
4.E Boiler type It will be detected automaticly of DHW or tank NTC and shown in display.
Possible values:
• 0 : only heating
• 1 : Combi• 2 : Tank with NTC (system boiler)
4.F Siphon filling mode Possible settings:
• 0 : Off
• 1 : On with min output (factory setting)• 2 : On with changed min CH output
5.A Reset service reminder If you see this symbol, you can reset to “0” after inspection.
5.b Fan overrun time Time intervall for the maintanence (month)
0 = Off
1 .. 72 = Time (Month)
5.F Inspection intervall If you see this symbol, you can reset to “0” after inspection.
6.A Calling up the last fault saved The function enables you to retrieve the last fault stored.
The service function is reset at 00.
6.C Setpoint value of the tempera-
ture from EMS-BUS
6.d Current turbine flow rate (combi) The current turbine flow rate is displayed.
Possible displays are:
• 0.0. - 20.0. l/min
7.A Backlight of LCD The following settings are possible:
• 00: Off• 01: on
Default setting : 00.
7.C Minimum DHW flow rate DHW heating is activated if amounts above this value are drawn off.
The following settings are possible (x 0,1):
• 25 … 50 litres per minute
Default setting : 25 l/min.
Service function Possible settings/display
Tab. 3 Menu 1
3 Service menu settings
Logamax PLus GB062 11
7.E Building dry function The building drying function of boiler doesn’t corresponds to the dry func-tion of the weather depended controls. In case of activation of this function, DHW and chmniy sweep function is no tpossible. During this period you can the symbol (dr) in display.
The following settings are possible:
• 00: Off
• 01: On
Default setting : 00.
P.0 Activiation of integrated WDC
(Weather Depended Controls)
function and set point of sum-
mer switch set-temperatur
• 0: WDC function is Off
• 1...30: Temperaturlimit for summer and WDC activiation
Default setting : 0.
P.1 Setpoint B of the heat curve for
WDC
20 ... 50 : Flowtemperature (set point)
P.2 Setpoint A of the heat curve for
WDC
50.. 88 ... 90: Flowtemperature (set point)
P.6 LCD Backlight (Permanent) • 0: Off
• 1: On
Default setting : 0.
P.7 Domestic hot water comfort • 0: Eco mode
• 1: Comfort mode
Default setting : 0.
Service function Possible settings/display
Tab. 3 Menu 1
3 Service menu settings
Logamax Plus GB06212
3.2.2 Menu 2
To call up a service function in this menu:
B Hold down “Back”, + and – at the same time until L.1 is shown on the display.
B Press – until L.2 is shown on the display.
B Press OK to make settings in menu 2.
B Press + or – to scroll through the menu's service functions.
Service function Possible settings/comments/displays
8.A Software version The current software version is displayed.
8.b Display soft code number
8.C Display internal status code internal parameter
8.d Display internal fault code internal parameter
8.E Returning the appliance to its
standard settings
This service function enables you to reset the appliance to its standard set-
tings.
Setting 00.
8.F Ignition test (permanent) • 0 = Off
• 1 = On
9.A Permanent operating mode This function permanently sets an operating mode.
The following settings are possible:
• 0: Standard operation; the appliance runs according to controller specifi-
cations.
• 1: The appliance runs at minimum output.
• 2: The appliance runs at maximum output.
Default setting : 0.
9.b Actual fan speed Actual fan speed in Hz
9.E Signal turbine delay
(Combi version)
Through spontaneous pressure change in the water supply, the flow meter (turbine) can signal that water is being drawn off. This means the burner starts briefly although no water is drawn off.
The turbine signal delay can be set from 1 to 8. One step corresponds to 0.25 seconds.
Default setting : 4 (0,25 seconds).
9.F Heating circuit pump overrun time The pump overrun time is started by the control system at the end of the heat demand. The following settings are possible:
• 1 to 10: overrun time in minutes (steps of 1 minute)
Default setting : 3 minutes.
A.A Temperature at flow temperature
sensor
This service function allows you to display the temperature at the flow tem-
perature sensor.
Tab. 4 Menu 2
3 Service menu settings
Logamax PLus GB062 13
A.b DHW temperature (Combi version) This service function allows you to display the DHW temperature.
A.C Temperature at cylinder tempera-
ture sensor (system version)
This service function allows you to display the temperature in the DHW cyl-
inder.
b.F DHW heating delay (solar mode) Heating will be suppressed until the DHW temperature sensor detects that
the water preheated by solar energy has reached the required outlet tem-
perature. Set the heating delay in accordance with system conditions.
The start delay can be set between 0 - 50 seconds.
Default setting is 0 (disabled).
F.2 Ionisation current • with running boiler (burner) :
– > 20 = OK
– < 20 = faulty
F.3 Permanent operation mode (chim-
niy sweeper)
Possible displays are:
• 0: normal operation mode
• 1: operation in max output for 15 minutes
Service function Possible settings/comments/displays
Tab. 4 Menu 2
3 Service menu settings
Logamax Plus GB06214
3.2.3 Menu 3
To call up a service function in this menu:
B Hold down “Back”, + and – at the same time until L.1 is shown on the display.
B Press – until L.3 is shown on the display.
B Press OK to make settings in menu 3.
B Press + or – to scroll through the menu's service functions.
Code List for the Service function E.1 :
Service function Possible settings/comments/displays
E.1 Appliance type, output, DHW heat-
ing (soft code)
This service function allows you to adjust the control unit to the appliance
output and the type of DHW heating (see table below regarding the code list
for this service function). This is only necessary when the control unit is
replaced.
F.1 Gas Type With this service functlon is changed the gas type.
B To change the actual gas type, press + and - button together until the
scroll up/down symbol is shon in display.
• 0 : Naturalgas
• 1 : Liquidgas (LPG)
Tab. 5 Menu 3
Country Definition of Appliance
Soft
Code
TR (Turkey) GB062-22 KD ... 21
IT (Italy) GB062-24 (K) ..... 22
GB062-24 KD ... 23
GB062-14 ... 24
AT (Austria) GB062-24 (K) ... 22
PL (Poland) GB062-24 (K) ... 27
GB062-14 ... 29
RO (Romania) GB062-24 .... 27
GB062-24 KD .... 28
GR (Greece) GB062-24 .... 27
GB062-24 KD ... 28
SK (Slovakai) GB062-24 (K) .... 27
GB062-14 .... 29
CZ (Czech
Repuclic)
GB062-24 (K) .... 27
GB062-14 .... 29
BE (Belgium) GB062-24 KDE .... 28
GB062-24 KD ... 26
GB062-14 .... 30
GB062-24 .... 25
Tab. 6 Code table for the service function E.1
This parameter is only available/active for the spare part change. By origin PCB (electronic card) this function is only visible.
This parameter should be adjusted by each PCB-Change regarding the TTNr. (Codelist is in PCB included).
4 Fault finding
Logamax PLus GB062 15
4 Fault finding
4.1 Explanations of faults table
Each title of the table shows the error code in the display and
at the same time the cause of the error in general. To repair
any possible fault in the device, follow the troubleshooting
steps in order until the fault is detected.
4.2 Fault group definition
Shown failures are divided in diffrent category :
• RUN: Fault does not block the burner.
• WAIT: Fault blocks the burner until faults removes.
• BLOCK : Fault blocks the burner until mains supply off
(volatile lockout).
• LOCK: Faults blocks the burner (nonvolatile lockout).
• RESET : Fault causes a board reset.
• HIST : Fault code is only stored in EEPROM fault history.
Failure CodeCause Code
Failure
Category Failure description Page
CL 324 RUN Hot water temperature sensor is faulty. 17
5L 323 RUN BUS-Communication fault. 19
CP 326 RUN WBC...D appliances (system boiler): Cylinder/tank temperature sensor. 20
3Y 334 WAIT The differential pressure switch is open before ignition (during self
check) (only high modulation version).
20
3C 217 WAIT Fan not running. 20
2E 207 WAIT Heating system charge pressure is too low. 23
8Y 232 WAIT External switching contact triggered. 24
4Y 223 WAIT Flow temperature sensor (CH-NTC) faulty. 26
4C 224 LOCK - Heat exchanger temperature limiter or flue gas temperature limiter has
tripped.
- The differential pressure switch does open when the fan runs (after
ignition) (only high modulation version).
30
6A 227 LOCK Flame not detected. 30
EC 256 LOCK Internal fault. 35
6C 228 LOCK Flame detected even when the burner is switched off. 36
6C 308 LOCK After switching gas off : Flame is detected. 37
EP 327 LOCK The “OK” button was actually pressed for at least 5 seconds (= reset). 38
WAIT Gradient Monitoring. 43
P 78 WAIT Appliance code not defined. 44
Tab. 7 Failure codes shown in display
4 Fault finding
Logamax Plus GB06216
Faults that are not shown on the display
Fault description Page
Combustion noise too loud; rumbling noises 42
Water circulation noises 44
Heat-up lasts too long. 45
Flue gas readings incorrect; CO content too high. 47
Ignition too strong, or poor. 47
Condensate in air box. 47
DHW outlet temperature not reached. 47
DHW volume (flowrate) not reached. 47
No function, the display remains dark. 47
Tab. 8
4 Fault finding
Logamax PLus GB062 17
4.3 Faults and possible remedy steps
CLHot water temperature sensor (DHW-NTC) is faulty.
Step Remedy
1. Check the hot water temperature sensor for
breaks or short CLcircuits.
B Switch off the boiler.
B Remove the Socket of NTC.
B Measure the electrical resistance of DHW-
NTC (in Ω) (see NTC tables).
Is the resistance value correct ?
yes: --> 2.
no: B Change the Sensor.
B Switch on the boiler.
CL on display ?
-->2.
2. B Switch off the boiler.
B Cut the main voltage supply.
B Check the soft code via Service function
E.1.
Is the code correct ?
yes B Switch on the boiler.
CL on display ?
-->3.
no: B Correct the right boiler type co5Lde.
CL on display ?
-->3.
3. Check the cables for damages.
B Switch off the boiler.
B In case of DHW-NTC is changed :- Remove the NTC socket.- Measure the NTC resistance.- Connect the socket again.
B Remove the big socket (20 Pole) on PCB.
B Measure the NTC resistance (Ω) on big
socket (PCB side).
Are measured resistance values on NTC
and socket side different ?
yes: B Change the cable haarness.
B Switch on the boiler.
CL on display ?
-->4.
no: --> 4.
4. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax Plus GB06218
5LBUS-Communication fault
Step Remedy
1. B Switch off the boiler.CP
B Cut the main voltage supply.
B Check the connection terminals at
controls and boiler.
Are the connection terminals dirty or
corroded ?
yes: B Clean the connection terminals.
B Connect the cable again.
B Switch on the boiler.
5L on display ? --> 2.
no: B Remove the control (thermostat) and check the
error again. If there is no error, check the control
(thermostat). Change if necessary, change it.
B Switch on the boiler.
--> 2.
2. B Check the connections between the
control (thermostat) and the boiler.
Is resistance very high ?
yes: B Switch on the boiler.
B Cut the main voltage supply.
B Change the connection cable between boiler and
control (thermostat).
B Switch on the boiler.
5L on display ? --> 2.
no: --> 3.
3. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax PLus GB062 19
CPSystem boiler: Cylinder / tank temperature sensor.
Step Remedy
1. Check the tank temperature sensor for
breaks or short circuits.
B Switch off the boiler.
B Remove the NTC of terminal.
B Measure the electrical resistance of Tank-
NTC (in Ω) (see NTC tables).
Is the resistance value correct ?
yes: --> 2.
no: B Change the Sensor (NTC).
B Switch on the boiler.
CP on display ?
-->2.
2. B Switch off the boiler.
B Cut the main voltage supply.
B Check the soft code and boiler type via
Service function E.1 and 4.E.
Is it correct ?
yes B Switch on the boiler.
CP on display ?
-->3.
no: B Correct the right boiler type code.
CP on display ?
-->3.
3. Check the NTC cables.
B Is there any damages or short circuit or
break ?
yes: B Change the cable/NTC.
B Switch on the boiler.
CP on display ?
-->4.
no: --> 4.
4. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax Plus GB06220
3YThe differential pressure switch is open before ignition (during self check) (only high modulation version).
Steps Remedy
1. Check the contacts of diff. pressure
switch.
B Switch off the boiler.
B Check the connection of diff. pressure
switch.
B Measure the circuit with a instrument.
The circuit /contact should be closed.
Is the contact /circuit open ?
yes: B Change the diff. pressure switch.
B Switch on the boiler.
3Y ? -->2.
no: B Connect the diff. pressure switch again.
B Switch on the boiler.
-->2.
2. Check the silicon hose.
Is there any blockage or stuck on silikon
hose ?
yes: B Switch off the boiler.
B Change the silicon hose or correct the stuck.
B Switch on the boiler.
3Y ? -->3.
no: -->3.
3. Check the low voltage cable for damages
or open circuit.
B Switch off the boiler.
B Remove the connection of PCB and
measure the circuit of the diff.
pressure switch.
B Measure the circuit with a instrument.
The circuit /contact should be closed.
Is the contact /circuit open ?
yes: B Change the low valtage cable.
B Switch on the boiler.
3Y ? --> 4.
no: --> 4.
4. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax PLus GB062 21
3CFan doesn't reach to start fan speed.
Step Remedy
1. Are the both fan cable (power and PMW
signal) correct connected ?
yes: --> 2.
no: B Switch off the boiler.
B Connect the cables again.
B Switch on the boiler.
3C ? -->2.
2. Is fan cable wrong ?
B Switch off the boiler.
B Cut the main voltage supply.
B Check the fan connection cable.
Is there open circuit ?
yes: B Chang the fan cable.
B Switch on the main voltage supply.
B Switch on the boiler.
3C ? -->3.
no: -->3.
3. Is fan defect ? yes: B Switch off the boiler.
B Cut the main voltage supply.
B Change the fan.
B Switch on the main voltage supply.
B Switch on the boiler.
3C ? --> 4.
no: --> 4.
4. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax Plus GB06222
2EHeating system charge pressure is too low (<0.5 bar). Water pressure switch is triggered.
Step Remedy
1. Check the system pressure. Is the pressure <0,5 bar ?
yes: B Switch off the boiler.
B Check the boiler and installation for the water
leakage. In case of a leakage, repair it.
B Fill the system with water (>1 bar).
B Switch on the boiler.
2E ? --> 2.
no: --> 2.
2. Check the manometer and manometer
pipe. Is it defect or blocked ?
yes: B Switch off the boiler.
B Change the manometer.
B Fill the system with 8Ywater (>1 bar).
B Switch on the boiler.
2E ? --> 3.
no: --> 3.
3. Check the expansion vessel precharge
pressure. Is it correct ?
yes: -- > 4.
no: B Switch off the boiler.
B Correct the pressure. If necessary, change the
expansion vessel.
B Check the system pressure, if necessery correct it.
B Switch on the boiler.
2E ? --> 4.
4. Check the water pressure switch and the connection cable for damages, blockage or open circuit. Is it correct ?
yes: -- > 5.
no: B Switch off the boiler.
B Change the water pressure switch or correct the
cable connection.
B Fill the system with water (>1 bar).
B Switch on the boiler.
2E ? --> 5.
4 Fault finding
Logamax PLus GB062 23
5. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
2EHeating system charge pressure is too low (<0.5 bar). Water pressure switch is triggered.
Step Remedy
4 Fault finding
Logamax Plus GB06224
8YExternal switching contact triggered.
Step Remedy
1. B Switch off the boiler.
Is the bridge in connection terminal
installed ?
yes: --> 2.
no: B Install the bridge in
B Switch on the boiler.
8Y ? --> 2.
2. B Switch off the boiler.
B Cut the main voltage supply.
Is external temperature limiter (e.g.
TB1) connected ?
yes: --> 3.
no: 8Y ? --> 6.
3. B Check the external temperature lim-iter measure the circuit. Is the circuit open?
yes: B Check the connection at limiter and fasten the screws
very well.
B Switch on the main voltage supply.
B Switch on the boiler.
8Y ? --> 4.
no: --> 4.
4. B Switch off the boiler.
B Cut the main voltage supply.
B Check the connection cable.
Is there a brake or open circuit in
connection cable ?
yes: B Repair or change the connection cable.
B Switch on the main voltage supply.
B Switch on the boiler.
8Y ? --> 5.
no: B Connect the cable again.
B Switch on the main voltage supply.
B Switch on the boiler.
--> 5.
4 Fault finding
Logamax PLus GB062 25
5. Is external temperature limiter (e.g.
TB1) triggered ?
yes: B Switch off the boiler.
B Check the reason for the external temperature limiter triggering and correct it.
Info : Max flow temperature can be adjusted in servi2E function 1.2b. It should be 5 K below of external temperature limiter and a d4Yistan2E 2 m from boiler to external temperature limiter.
B Reset the external temperature limiter.
B Switch on the boiler.
8Y ? --> 6.
no: --> 6.
6. B Switch off the boiler.
Is the bridge in connection terminal
installed ?
yes: -- > 7.
no: B Install the bridge.
B Switch on the boiler.
8Y ? --> 7.
7. External temperature limiter is locked or
defect ?
B Switch off the boiler.
B Cut the main voltage supply.
B Reset or change the external temperature limiter.
B Switch on the main voltage supply.
B Switch on the boiler.
8YExternal switching contact triggered.
Step Remedy
4 Fault finding
Logamax Plus GB06226
4YFlow temperature sensor (CH-NTC) faulty.
Step Remedy
1. Check the flow temperature sensor for
damages.
B Switch off the boiler.4C
B Remove the Socket of NTC.
B Measure the electrical resistance of
CH-NTC (in Ω) (see NTC tables).
Is the resistance value correct ?
yes: --> 2.
no: B Change the Sensor.
B Switch on the boiler.
4Y on display ?
-->2.
2. Check the NTC cables for damages.
B Switch off the boiler.
B In case of CH-NTC is changed :- Remove the NTC socket.- Measure the NTC resistance.- Connect the socket again.
B Remove the big socket (20 Pole) on
PCB.
B Measure the NTC resistance (Ω) on
big socket (PCB side).
Are measured resistance values on
NTC and socket side different ?
yes: B Change the cable haarness.
B Switch on the boiler.
4Y on display ?
-->3.
no: --> 3.
3. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4 Fault finding
Logamax PLus GB062 27
4C- Heat exchanger temperature limiter or flue gas temperature limiter has tripped.
- The differential pressure switch does open when the fan runs (after ignition) (only high modulation version).
Step Step
1. Is the system water pressure in green
area (1 - 2 bar) ?
yes: -->2.
no: B Add or correct the system water pressure.
B Bleed the air in system.
B Make RESET and start the boiler again.
4C ? --> 2.
2. Is the circulation pump blocked or
problem voltage supply ?
yes: B Remove the blockage (turn the pump shaft).
If no result :
B Switch off the boiler and cut the main supply.
B Drain of he water in boiler.
B Check the fuses. if OK, change the circulation pump.
B Refill the system again and bleed the air.
B Switch on the main supply and the boiler.
4C ? --> 3.
no: --> 3.
3. Are the flue gas temperature limiter
(STB) cables disconnected ?
yes: B Switch off the boiler.
B Connect the cables.
B Switch on the boiler.
4C ? --> 4.
no: --> 4.
4. B Switch off the boiler.
B Remove the flue gas temperature
limiter (STB) connection cables.
B Measure the flue gas temperature
limiter (STB).resistance.
Is there circuit open?
yes: B Change the flue gas temperature limiter (STB).
B Connect the cables.
B Switch on the boiler.
4C ? --> 5.
no: B Connect the flue gas temperature limiter (STB) cables.
B Switch on the boiler.
--> 5.
4 Fault finding
Logamax Plus GB06228
5. Are the heatexchanger temperature
limiter (STB) cables disconnected or
loose?
yes: B Switch off the boiler..
B Connect the cables again.
B Switch on the boiler.
4C ? --> 6.
no: --> 6.
6. B Switch off the boiler.
B Remove the heat exchanger
temperature limiter (STB) connection
cables.
B Measure the heat exchanger
temperature limiter (STB).resistance.
Is there circuit open?
yes: B Change the heat exchanger temperature limiter (STB).
B Connect the cables again.
B Switch on the boiler.
4C ? --> 7.
no: B Connect the heat exchanger temperature limiter (STB)
cables.
B Switch on the boiler.
--> 7.
7. B Switch off the boiler.
B Remove the front cover and first
visual check of main heat exchanger
(WB6) for damages, corrosions or
rippen effect.
B Measure the actuating pressure for
the maintenance necessity (Steuer-
druck). if the pressure not OK. Clean
the WB6 (see capital in IM for the
maintenace pressure).
Is the main heat exchanger (WB6)
visual and pressure OK ?
yes: 4C ? --> 8.
no: B Clean the WB6. Check the burner, upper and down
buffels (inside WB6). If there any damages on WB6,
change it.
B Refill the system with water.
B Switch on the boiler.
--> 8.
8. B Switch off the boiler.
B Check the connection cables and the
diff. pressure switch itself.
Is the circuit open (default closed) ?
yes: 4C ? --> 9.
no: B Correct the cable or connection. If necessary, change
the diff. pressure switch.
B Switch on the boiler.
--> 9.
4C- Heat exchanger temperature limiter or flue gas temperature limiter has tripped.
- The differential pressure switch does open when the fan runs (after ignition) (only high modulation version).
Step Step
4 Fault finding
Logamax PLus GB062 29
9. B Switch off the boiler.
B Check the flue gas 6Apipe/system
for blockage (In case of blockage,
due to high pressure the contacs of
diff. presure switch is opening--> 4C)
Is there a blockage in flue gas pipe ?
no: 4C ? --> 10.
yes: B Correct the flue gas installation (remove the blockage).
B Switch on the boiler.
--> 10.
10 Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB).
B Switch on the main voltage supply.
B Switch on the boiler.
B END
4C- Heat exchanger temperature limiter or flue gas temperature limiter has tripped.
- The differential pressure switch does open when the fan runs (after ignition) (only high modulation version).
Step Step
4 Fault finding
Logamax Plus GB06230
6AFlame not detected.
Step Remedy
1. B Switch on the boiler.
Is flame visible ?
yes: --> 2.
no: --> 2.
2. Check / measure the ionisaiton cur-rent. Is it correct ?
yes: B Switch off the boiler.
B Cut the m6Aain supply.
B Earth connection : Check the earth circuit connection.
If necessary, correct it.
B Switch on the main supply.
B Switch on the boiler again.
--> 3.
no: B Open the gas valve.
B Press the RESET button and start the boiler again.
6A ? --> 3.
3. Is gas valve open ? yes: --> 4.
no: B Open the gas valve.
B Press the RESET button and start the boiler again.
6A ? --> 4.
4. Is there air in the gas line ? yes: B Open the gas valve.
B Press the RESET button and start the boiler again. If
necessary, repeat this operatrion.
6A ? --> 5.
no: --> 5.
5. Is the termal gas valve triggered ?
(if a termal gas valve is installed)
yes: B Replace the thermal gas valve.
B Press the RESET button and start the boiler again.
6A ? --> 6.
no: --> 6.
4 Fault finding
Logamax PLus GB062 31
6. Natural gas :
Is there a gas pressure regulator
installed ?
yes: B Check the gas regulator correct installation. If
necessary, correct it.
B Check the gas inlet pressure. If there is a deviation.
Inform the gas company.
B Is the gas type adjustment in Service function 3.F1
correct ?
B Press the RESET button and start the boiler again.
6A ? --> 7.
no: --> 7.
LPG (Liquid gas):
Is there correct / sufficient gas flowrate to
the boiler ?
yes: --> 7.
no: B Is LPG tank sufficiently full?
B Is there air in the gas line?
B Is the external magnet valve open / triggered ?
B Is the gas inlet pressure correct ? (if it is high, check
the gas regulator).
B Press the RESET button and start the boiler again.
6A ? --> 7.
7. Is the siphon blocked ? yes: B Clean or correct the siphon.
--> 8.
no: --> 8.
8. Is the gas valve robust ?
B Switch off the boiler.
B Disconnect the cable socket.
B Measure / check the resistance of
security valves I and II.
(See electrical data sheet)
yes: B Connect the cable socket again.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6A ? --> 9.
no: B Switch off the boiler and close the inlet gas valve.
B Replace the gas valve.
B Open the inlet gas valve.
B Connect the cable socket.
B Switch on the boiler.
B Chech boiler for the gas leakege.
B Press the RESET button and start the boiler again.
6A ? --> 9.
6AFlame not detected.
Step Remedy
4 Fault finding
Logamax Plus GB06232
9. B Enter into the 2. service level.
B Call the service function 8.FIs the permanent ignition (without gas)
correct ?
yes: B Press the “Return” button twice to exit the service
mode.
-->10.
no: B Press the service button twice to exit the service
mode.
-->10.
10. Ist the cable connected to the ignition
electrode ?
yes: -->10.
no: B Connect the ignition cable to the electrode.
B Press the RESET button and start the boiler again.
6A ? -->10.
11. Is the ignition cable connected correctly
to the control unit ?
yes: -->11.
no: B Switch off the boiler.
B Connect the ignition cable correctly to the ignition
unit.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6A ? -->11.
12. Ionization cable damage ? yes: B Switch off the boiler.
B Change the ionization cable.
B Switch on the boiler.
6A ? --> 12.
no: --> 12.
13. Check the ignition electrodes.
B Switch off the boiler.
B Remove (dismount) the ignition
electrodes.
Is the electrode worn or dam-aged?
yes: B Change the ignition electrodes.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6A ? --> 14.
no: B Install the ignition electrodes.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6A ? --> 14.
6AFlame not detected.
Step Remedy
4 Fault finding
Logamax PLus GB062 33
14. B Switch off the boiler.
B Remove the mix unit.
Check the diaphragm for the damage,
dirt or adhesion.
Is the diaphragm OK ?
yes: B Install the diaphragm correctly in mix-unit again.
B Install the mix-unit.
B Press the RESET button and start the boiler again.
6A ? --> 15.
no: B Install the ignition electrodes.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6A ? --> 15.
15. Check the gas-air ratio setting (max):
B Remove the cap in the flue gas
measuring point.
B Activiate the permanent max opera-
tion mode (chimniy sweeper) via serv-
ice function 2.F3.
B Measure the CO2 / O2 value (see
instruction manual) :
Are the values correct ?
yes: 6A ? --> 16.
no: B In case of deviation, correct the gas adjustment.
6A ? --> 16.
16. Check the gas-air ratio setting (min):
B Remove the cap in the flue gas
measuring point.
B Activiate the operation mode to 1 via
service function 1.2F.
B Measure the CO2 / O2 value (see
instruction manual) :
Are the values correct ?
yes: 6A ? --> 17.
no: B In case of deviation, correct the gas adjustment and
close the cap again.
6A ? --> 17.
17. B Switch off the boiler.
B Condensate traces in the fresh air
pipe of flue gas sysyem ?
yes: B Clean the flue gas system (maintanance).
6A ? --> 18.
no: B Switch on the boiler.
6A ? --> 18.
6AFlame not detected.
Step Remedy
4 Fault finding
Logamax Plus GB06234
18. Fresh air flow rate is too low ? yes: B Check the flue gas system for lengths, elbows
quantity, extension pipe and other accessories. If
needed, correct/change it.
B Check the air vents in case of B type installation
(fresh air from room).
6A ? --> 19.
no: 6A ? --> 19.
19. B Switch the boiler to max operating
mode via service function 2.F3.
B Measure the actuating pressure for
the maintenance necessity (Steuer-
druck) (see capital in IM for the main-
tenace pressure).
Is the actuating pressure (Steuer-
druck) in heat exchanger (WB6)
correct ?
yes: B Switch off the boiler.
B Clean the main heatblock (WB6).
B Switch on the boiler.
6A ? --> 20.
no: 6A ? --> 20.
20. Electronic board (PCB) is defect. B Switch off the boiler.
B Change the electronic board (PCB)
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
6AFlame not detected.
Step Remedy
4 Fault finding
Logamax PLus GB062 35
ECInternal fault (Internal fault in the program sequence or failure of the mains voltage).
Step Remedy
1. Is blinking error code in display ? yes: B Reset the boiler and restart the boiler again.
EC ? --> 2.
no: --> 2.
2. B Switch off the boiler.
B Is the ignition cable connection loose
or damaged ?
yes: B Change the ignition cable and the connection or if
possible fix it.
B Switch on the boiler.
EC ? --> 3.
no: --> 3.
3. Check the O2 CO values at min. and
max. Are the values correct ?
yes: --> 4.
no: B Correct he adjustment.
EC ? --> 4.
4. B Switch off the boiler.
B Cut the main voltage supply.
B Is there any damage on securty
valve (gas valve) or connection
cable?
yes: B Change the connection cable to securty valve.
B Switch on the boiler.
EC? --> 5.
no: --> 5.
5. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB)
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
4 Fault finding
Logamax Plus GB06236
6C 228Flame detected even when the burner is switched off.
Step Remedy
1. B Switch off the boiler.
B Remove the electrode set .
B Check the ionization electorode. Is there any crack, wear or con-tamination ?
yes: B Replace the ionisazation electrode.
B Install the electrode set again.
B Switch on the boiler.
6C ? -->2.
no: 6C ? --> 2.
2. B Switch off the boiler.
B Remove the electronic board (PCB) .
B Check the electronic board (PCB). Is there any moisture or water drops on PCB?
yes: B Dry the PCB or if necessary replace it.
B Install the PCB again.
B Switch on the boiler.
6C ? -->3.
no: 6C ? --> 3.
2. Electronic board (PCB). B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB)
B Check the cable lugs (grommets) that provide sealing to
the housing where the cables pass through the control
unit. If necessary, change it.
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
4 Fault finding
Logamax PLus GB062 37
6C 306After switching gas off : Flame is detected.
Step Remedy
1. B Close the gas inlet valve.
B Switch off the boiler.
B Replace the gas valve.
B Check the O2 values. If neceassary, correct it.
B Open the gas valve again. Check it for leaks.
B Switch on the main voltage supply.
B Press the RESET button and start the boiler again.
B Switch on the boiler.
6C ? --> 2.
2. Cable harness is defect. B Switch off the boiler.
B Change the cable harness.
B Switch on the boiler.
B Press the RESET button and start the boiler again.
6C ? --> 3.
3. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB)
B Switch on the main voltage supply.
B Switch on the boiler.
B Not edilen servis ayarlarýný tekrar ayarlayýn.
4 Fault finding
Logamax Plus GB06238
EPThe “OK” button was actually pressed for at least 5 seconds (= reset) or short circuit form low voltage cable to the
frame.
Step Remedy
1. Is blinking error code on display? no: --> 3.
yes: B Press the RESET button and start the boiler again.
EP ? --> 3.
2. Check the low voltage cable (STB, gas
valve cable) for short circuit to the frame.
B Switch off the boiler.
B Cut the main voltage supply.
B Replace the low voltage cable.
B Switch on the main voltage supply.
B Switch on the boiler.
3. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Change the electronic board (PCB)
B Switch on the main voltage supply.
B Switch on the boiler.
(Gradient Monitoring)
Rapid overshooting of the flow water temperature (Gradient control) (Heating circuit is blocked for 2 min.)
Step Remedy
1. Are the maintanace valves (flow / return)
open ?
yes: -->2.
no: B Open the valves.
Error continuing ? -->2.
2. Check the main (WB6) and plate heatchanger. Is there any blockages or damages?
no: -->2.
yes: B Remove the blockages or replace it.
Error continuing ? -->2.
3. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Remove the pump blockage or replace it.
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
4 Fault finding
Logamax PLus GB062 39
PAppliance not defined.
Step Remedy
1. Softcode for boiler type not defined.
Softcode nummer list is given in spare
part package or see capitel 3.
no: -->2.
yes: B Set appliance type (service function 3.E1)
P ? -->2.
2. Electronic board (PCB) is defect. B Switch off the boiler.
B Cut the main voltage supply.
B Remove the pump blockage or replace it.
B Switch on the main voltage supply.
B Switch on the boiler.
B END.
4 Fault finding
Logamax Plus GB06240
4.4 Faults that are not shown on the display
Faults Remedy
Combustion noise too loud; rumbling noises. B Check gas type.
B Check gas supply pressure.
B Check flue system, clean or repair if required.
B Check gas/air ratio; correct if required.
B Check the gas valve and replace it if required.
Water circulation noises B Set the pump rate or pump characteristic map correctly
and match it to the maximum performance.
Heat-up lasts too long B Set the pump rate or pump characteristic map correctly
and match it to the maximum performance.
Flue gas readings incorrect; CO content too high B Check gas type.
B Check gas supply pressure.
B Check flue system, clean or repair if required.
B Check gas/air ratio; correct if required.
B Check the gas valve and replace it if required.
Ignition too strong, or poor. B Check gas type.
B Check gas supply pressure.
B Check the power supply.
B Check the electrodes and cable, replace if required.
B Check flue system, clean or repair if required.
B Check gas/air ratio; correct if required.
B For natural gas: Check external gas flow monitor,
replace.
B Check burner. Replace if required.
B Check the gas valve and replace it if required.
Condensate in air box. B Check diaphragm in the mixer unit, replace if required
DHW outlet temperature not reached.. B Check turbine. Replace if required.
B Check gas/air ratio; correct if required.
DHW volume not reached. B Check the DHW water inlet pressure.
B Check the plate heat exchanger.
B Check the strainer in the cold water pipe.
No function, the display remains dark. B Check electrical wiring for damage.
B Replace faulty cables.
B Check the fuse, replace if required.
Tab. 9 Faults that are not shown on the display
5 Electrical values, gas conversion and boiler layout
Logamax PLus GB062 41
5 Electrical values, gas conversion and boiler layout
5.1 Sensor (NTC) Values
5.1.1 Domestic hot water temperature Sensor
5.1.2 Central Heating Flow Temperature Sensor, Storage Tank Temperature Sensor
5.1.3 Outdoor Temperature Sensor (7.747.026.229)
Temperature ( °C) Measure Tolerance ± %10 Resistance ( Ω)
0 28704
10 18410
20 12171
25 10000
30 8269
35 6881
40 5759
45 4847
50 4101
55 3488
60 2981
65 2559
70 2207
75 1912
80 1662
85 1451
90 1272
Tab. 10 Domestic hot water temperature Sensor
Temperature ( °C) Measure Tolerance ± %10 Resistance ( Ω)
20 14772
25 11981
30 9786
35 8047
40 6653
45 5523
50 4608
55 3856
60 3243
65 2744
70 2332
75 1990
80 1704
90 1262
100 950
Tab. 11 Central Heating Flow Temperature Sensor, Storage Tank Temperature Sensor
Temperature ( °C) Measure Tolerance ± %10 Resistance ( Ω)
-20 95893
-15 72228
-10 548890 32506
10 19860
20 12486
30 8060
5.1.4 Buderus Outdoor Temperature Sensor
5 Electrical values, gas conversion and boiler layout
Logamax Plus GB06242
5.2 Gas conversion steps
Fig. 5 Gas conversion steps
5 Electrical values, gas conversion and boiler layout
Logamax PLus GB062 43
5.3 Condens 2500W / CerapurCompact
5.3.1 GB062-24K....
Bild 6 El. Wiring diagram_GB062-24K..
1 Gas valve
2 CH flow temperature sensor (CH_NTC)
3 Ignition electrode
4 Flame (Ionisation) electrode
5 Temperature limiter for heat exchanger
6 Fan
7 Turbine
8 3 way valve
9 Central heating pump
10 DHW temperature sensor DHW_NTC (GB062...K..)
11 Connection for external limiter (e.g TB1)
12 Flue gas temperature limiter (AGÜ)
13 CH pressure switch (0,5 bar)
14 2 Phase Power modul (only Belgium)
15 230 V- Power cable16 Ignition transformer
17 Fuse
18 Outdor Sensor (AF) connection19 Connection for EMS or On/Off controls
20 Diagnostic connection
21 Tank temperature NTC conection (only GB062-14/24 HV2)
22 Air Pressure Switch (APS) (only high modulation....V2)
5 Electrical values, gas conversion and boiler layout
Logamax Plus GB06244
5.3.2 Electrical valuesElectrical values for Logamax GB062...
Pos. Description Measurement Point Expected value
Service
Func-
tion
Toler-
ance Remark
8 3 Way valve motor Pin : 2 -3
70 Ohm ± 5
Ohm
measure on the
motor socket
9 Pump (3 Step ) I : 475 OhmII : 340 OhmIII : 210 Ohm
± 10
Ohm
Measure on the
pump socket.
9 Modulating pump 4,0 MOhm ± 1
KOhm
Measure on the
pump socket.
Functiontest with
service function
t03.
16 Domestic hot water
temperature sen-
sor (DHW-NTC)
20 ºC => 12,17 kOhm
60 ºC => 2,98 kOhm
A.B ± 0,5
kOhm
or measure on
the sensors
(NTC) self.
20 Air-Pressure-
Switch (APS)
Workingspressure : 3,88
/ 3,53 mbar.
measure on APS.
PIN 1 -2 is closed
(default)
1 Gas valve EV1 (Pin : 3-4)
EV2 (Pin : 1-3)
100 Ohm
230 Ohm
±10
Ohm
Supply 24 VDC
18 Flue gas tempera-
ture limiter (AGÜ)
0 Ohm - Temperatur limit
= 120 ºC
2 Flow - sensor or
boiler temperature
sensor
20 ºC => 14,77 kOhm
80 ºC => 1,7 kOhm
A.A ± 0,5
kOhm
4 Flame sensing
(ionisation) elec-
trode
Measure on the PCB or
electode
> 20 µA F.2 -
5 Temperature lim-
iter for heat
exchanger (STB)
0 Ohm - Temperatur limit
= 115 ºC (+10/-
14)
Tab. 12 Electrical values
5 Electrical values, gas conversion and boiler layout
Logamax PLus GB062 45
6 Fan (modulating) Electrical measurement
on fan is not possible. It
can be only tested
whether it is work or not.
The connection should be
as shown on the picture.
Functiontest with service
function t02
7 Flowrate sensor
(Turbine)
Cable colour : black /
white / grey
1,5 l/min. = 5 Hz
10 l/min. = 33 Hz
15 l/min. = 50 Hz
6.d ± 2 Hz Supply : 4,5 - 13
Output current :
15 mA
Pos. Description Measurement Point Expected value
Service
Func-
tion
Toler-
ance Remark
Tab. 12 Electrical values
L N
GND PMW
6 Inspection and maintanance
Logamax Plus GB06246
6 Inspection and maintanance
6.1 Safety instructions for inspection and maintenance
Only approved contractors may carry out inspection and
maintenance. The manufacturer's maintenance instructions
must be observed. Failure to comply with instructions may
result in material damage and personalinjury, including possi-
ble loss of life.
B Inform the user of the consequences of insufficient or non-
existent inspection and maintenance.
B Have the heating system inspected at least once a year,
and have any required maintenance or cleaning work car-
ried out.
B Remedy all faults immediately.
B Check the heat exchanger at least every 2 years, and if
necessary clean it. We recommend an annual inspection.
B Use only original spare parts (see the spare parts cata-
logue).
B Replace removed gaskets and O-rings with new ones.
Touching live parts can result in an electric shock.
B Before carrying out work on electrical components, isolate
them from the power supply (230 V AC) (fuse, circuit
breaker) and secure against unintentional reconnection.
Escaping flue gas can cause poisoning.
B Check for leaks after working on flue gas-carrying compo-
nents.
Escaping gas can cause an explosion.
B Close the gas isolator prior to working on gas-carrying
components
B Carry out tightness test.
Hot water can lead to severe scalding.
B Warn residents of risk of scalding.
B Perform thermal disinfection outside of the normal operat-
ing times.
• The following measuring devices are required :
– Electronic flue gas analyser for CO2, O2, CO and flue
gas temperature
– Pressure gauge 0 - 30 mbar (minimum resolution 0.1
mbar)
B Use heat conducting paste 8 719 918 658 0.
B Use approved greases.
B Re-tighten all the threaded connections that have been
released.
B Restart the appliance.
B Check all joints for leaks.
B Check the gas/air ratio.
Notes for the target group
Danger to life through electric shock !
Risk of death from escaping flue gas !
Risk of explosion from escaping gas !
Risk of scalding from hot water !
Resources for inspection and maintenance !
After the inspection/maintenance !
6 Inspection and maintanance
Logamax PLus GB062 47
6.2 Check the heat exchanger
B Remove the casing.
B Remove the cap from the test nipple, and connect a pres-
sure gauge.
Fig. 7 Test nipple on the mixer unit
B Check actuating pressure at maximum rated output at
mixer unit.
B The heat exchanger must be cleaned if the in instruction manual given actuating pressure achieved. There could be differences between each other boiler type. Pleass look related instruction manual.E.g.:
– GB062-24 KDH V2.. < 2.5 mbar
– GB062-24 KDE H V2 < 11,5 mbar
6.3 Check the electrodes and clean the heat exchanger
Use accessory no. 1156, part no. 7 719 003 006, comprising
a brush and removal tool, to clean the heat exchanger.
1. Remove the suction line.
2. Press the locking device onto the mixer unit, rotate it down-ward, and remove the mixer unit by pulling it forward.
Fig. 8 Remove suction line and mixer unit
1. Pull off cable from the ignition and monitoring electrode.
2. Press the cable restraint and remove the plug.
3. Remove the earth wire.
4. Unscrew the nut and remove the fan
Fig. 9 Removing the Fan
B Remove electrode set with gasket and check electrodes
for contamination : clean or replace, if required.
B Remove burner.
CAUTION : Risk of burns due to hot surfaces!Individual components of the boiler can become
very hot even after being shut down for a long
time.
B Before working on the boiler: Allow the device to cool down.
B If necessary, wear protective gloves.
6 720 615 492-15.2O
1.
2.
0 010 002 791-001
0 010 005 830-001
2.
3. 1.
4.
6 Inspection and maintanance
Logamax Plus GB06248
Fig. 10 Remove the burner
B Remove the top displacement body using the lifting device.
Fig. 11 Removing the top displacement body.
B Remove the bottom displacement body using the lifting
device.
Fig. 12 Removing the bottom displacement body.
B Clean both displacement bodies.
B Clean the heat exchanger with the brush :
– rotate in both directions
– from top to bottom to each catch
B Remove the screws from the cover of the inspection aper-
ture and and remove the cover.
Fig. 13 Cleaning the heat exchanger
B Vacuum out residues and close the inspection cover
again.
B The heat exchanger can be inspected for residue with the
aid of a torch and mirror.
6 720 611 626-82.1R
6 720 613 630-02.1ITL
6 720 613 630-01.3ITL
6 7
20
61
2 6
59
-53
.4T
T
6 Inspection and maintanance
Logamax PLus GB062 49
Fig. 14 Checking heat exchanger for residue
B Refit the displacement bodies.
B Remove the condensate trap and place a suitable con-
tainer below.
B Flush out the heat exchanger with water from the top.
Fig. 15 Flush out the heat exchanger with water
B Reopen inspection aperture and clean the condensation
catch pan and condensate connection.
B Adjust the gas/air ratio.
6.4 Cleaning condensate trap
Fig. 16 Removing the condensate trap
B Clean the condensate trap, and check that the aperture
towards the heat exchanger is clear.
B Check condensate hose and clean if necessary.
B Fill condensate trap with approx. ¼ l water and refit.
6.5 Check diaphragm (flue gas non-return
device) in the mixer unit
B Remove mixer unit.
B Check diaphragm for dirt and cracks.
Fig. 17 Diaphragm in mixer unit
Material damage due to hot flue gas! Hot flue gas can leak through defective seals, damage the devices and endanger safe operation.
B Replace all seals involved whenever mainte-
nance or an inspection is carried out.
B Ensure that the seals are seated exactly.
6 720 804 853-21.1ITL
6 72
0 61
1 62
6-85
.2O
OH2
Risk to life through poisoning !
If the condensate trap is not filled, poisonous
flue gas can escape.
B Before commissioning, make sure that the si-
phon is filled with water.
B If available: Only turn off the trap filling pro-
gram during maintenance, and turn it back
on the end of maintanance.
B If available Use the boiler's built-in siphon.
B Make sure that the condensate drains cor-
rectly.
1. 2.
0 010 005 831-001
3.
6 720 615 492-18.3TT
6 Inspection and maintanance
Logamax Plus GB06250
6.6 Checking the strainer in the cold water pipe
B Remove the clip.
B Pull out the pressure relief valve.
Fig. 18 Removing the pressure relief valve (heating circuit)
1. Remove the clip.
2. Pull out the insert.
3. Check strainer for contamination.
Fig. 19 Checking the strainer in the cold water pipe
6.7 GB062..K.. (Combi) appliances: Check the
plate heat exchanger
If the DHW output is insufficient :
B Check the strainer in the cold water pipe for contamination.
B Descale the plate heat exchanger with scale removal
agent approved for stainless steel (1.4401).
-or-
B Remove plate heat exchanger and replace.
1. Remove the screw.
2. Remove the plate heat exchanger.
Fig. 20 Removing the plate heat exchanger
6.8 Checking the expansion vessel
The expansion vessel must be checked every year.
B Depressurise the device.
B Adjust the pre-charge pressure of the expansion vessel to
the static head of the heating systems, if necessary.
6.9 Setting the heating system operating pressure
If the indicator is below 1 bar when the system is cold :
1.
2.
0 010 006 637-001
1.
2.3.
0 010 006 636-001
Display on the pressure gauge
1 bar Minimum filling pressure (when sys-
tem is cold)
1 - 2 bar Optimal charge pressure
3 bar Maximum charge pressure at maxi-
mum heating water temperature must
not be exceeded (pressure relief
valve will release).
Tab. 13
0 010 005 834-001
1.
2.
6 Inspection and maintanance
Logamax PLus GB062 51
B Top up the water until the indicator is between 1 bar and 2
bar again.
If pressure is not being maintained :
B TCheck expansion vessel and heating system for leaks.
6.10 Removing automatic air vent valve
1. Remove the clip.
2. Remove the automatic air vent valve.
Fig. 21 Removing automatic air vent valve
6.11 Checking the gas valve
B Pull plug (24 V) from the gas valve
B Check the resistance of solenoid valves [1] and [2].
Fig. 22 Test points on the gas valve
[1] Solenoid valve 1 test points (3-4)
[2] Solenoid valve 2 test points (1-3)
B Replace gas valve if the resistance is 0 or ∞.
6.12 Removing the gas valve
B Close the gas valve.
1. Remove the clip.
2. Open the lockings system on the gas pipe.
3. Remove the gas pipe.
4. Pull plug (24 V) from the gas valve
5. Unscrew the nut.
Fig. 23 Remove the gas valve
B Use a screwdriver to release the locking device on both
sides.
B Remove the gas valve and pull the plastic jacket.
Fig. 24 Remove the gas valve, remove the locking device
B Install the gas valve in reverse sequence, and adjust the
gas/air ratio.
2.
1.
0 010 006 638-002
0 010 005 836-001
2
1
1 2
3 4
6 720 812 301-05.1O
3.4.
2.
1.
1.
1.
2.
3.
2 x
6 720 812 301-06.1O
6 Inspection and maintanance
Logamax Plus GB06252
6.13 Remove the heating pump
1. Unplug the plug.
2. Remove screws.
3. Pull out the pump head towards the front.
Fig. 25
6.14 Removing the motor of the 3-way valve
1. Undo clip.
2. Remove the motor of the 3-way valve.
Fig. 26
B Press the cable restraint and remove the plug.
6.15 Remove the heat exchanger
B Remove suction line and mixer unit.
B Remove the fan.
1. Remove the clip.
2. Remove the flow pipe.
3. Remove the cable from the flue gas temperature limiter
4. Remove the nut
Fig. 27 Remove the flow pipe and disconnect the cable
1. Unclip the vent pipe and push it upwards.
2. Rotate the vent pipe clockwise.
3. Remove the heat exchanger
Fig. 28 Remove the heat exchanger
0 010 006 639-002
1.
3.
2.
1.
2.
0 010 006 640-002
0 010 005 852-001
1.
2.
3.
4.
0 010 005 853-001
3. 1.
2.
7 Good to know
Logamax PLus GB062 53
7 Good to know
7.1 Integrated Weather Dependet Function (WDC) - Heat curve
Weather dependet function (WDC) can activated via service funtion 1.P.0. Following parameter A, B and S can be adjustet.
Fig. 29 Heating curve
A End point (at the outside temperature – 10 °C) Adjustment via service function : 1.P.2
AT Outside temperature B Base point (at the outside temperature + 20 °C)
Adjustment via service function : 1.P.1max Maximum flow temperature pA Flow temperature at the end point of the heating curve pB Flow temperature at the foot point of the heating curve S Automatic heating switch-off (summer mode)
Adjustment via service function : 1.P.0
VT Supply temperature
7.2 Boiler Frost protection
The device frost protection function switches the burner and
heating pump on when the temperature in the installation
room (at temperature sensor for heating low) falls below 5 °C.
This prevents the boiler freezing.
Fig. 30 Boiler frost protection
7.3 Air purging in central heating mode
Service function : 1.2.C (Factory setting =1).When the service function 1.2.C is 1 (active), then this function is active at first power on. The duration for this function is 2 minutes. No central heating or siphon filling active when this function is enabled. When DHW (Domestic hot Water) requested, this mode interrupt,
but goes on after DHW request. Pump is switching on and off every 20 seconds.
Fig. 31 Air purging
7.4 Air Pressure Switch (APS)
Th purpose of using an APS is to detect a flue blockage, if it
happens and safety shut down the burner. APS is physically
connected in serial with safety thermostat (STB).
Fig. 32 Air Pressure Switch (APS)
0 - t1 Burner off, no APS check
t1 heat demand starts (burner on request) t1 - t2 : Waiting time:
- fan speed setpoint = fan start speed- waiting time 2 sec.
t2 - t3 : Fan and APS check :- fan speed setpoint = fan start speed - APS needs to be checked, if APS is open (high pressure), error 3Y shall be set, aftr 5 min., error shall be reset abd next start attempt will be executed.- APS must be closed (low pressure) and fan must reach start-fanspeed +-3 Hz, if so ignition starts.- if fan doesn’t reach startspeed +-3 hz within 300 sec. error 3C shall be set, after 5 min., error shall be reset abd next start attempt will be executed.
t3- t4 : Ignition : - fan speed setpoint = fan start speed- ignition starts- APS is monitored by GFA (in serial to STB), if APS is open, 4C lockout error is set (GFA). Minimum time is 0.5 sec.- APS is monitored by GFA (in serial to STB), if APS is close, flame must be available within safety time of 4 seconds.- if flame isn't available, next start attempt will be executed after purge time, after 5th start attempt, 6A lockout error is set (GFA)
t4 Burner on
8 Components
Logamax Plus GB06254
8 Components
8.1 Mixing unit
Fig. 33 Mixer unit differences
The mixing unit from 14 kW is red / black.
8.2 Resonator & Burner
Fig. 34 Resonator and Burner differences
Resanotor is only available in 24 kW high modulation (HM) appliances .
8 Components
Logamax PLus GB062 55
8.3 Venturi
Fig. 35 Differences between normal and high modulation (HM) venturis
8 Components
Logamax Plus GB06256
8.4 Circulation Pump (ErP pump)
Fig. 36 Pump_LEDs
Fig. 37 Adjustment possibility between constant speed or variable spees (modulation).
Fig. 38 Pump_LED diagnose and remedy.