Service Manual Gas Wallhung Boiler - Central Instal...Operation 2 Logamax PLus GB062 5 2.4 Setting the maximum flow temperature The maximum flow temperature can be set between 40 C

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


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 Press OK.

The set DHW temperature is displayed.

B Press + or – to set the required DHW temperature.


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 Press OK.

The set maximum flow temperature is displayed.

B Keep pressing – until ... appears on the display.


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



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.


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.


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.


Tab. 3 Menu 1



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.


• 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.


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.


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.


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.



Tab. 3 Menu 1


Logamax Plus GB06210

4.b max pre heat temperature for

comfort function (combi)

max DHW pre heat temperature for comfort function.


• 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


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.


Tab. 3 Menu 1



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.


• 00: Off

• 01: On


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


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


P.7 Domestic hot water comfort • 0: Eco mode

• 1: Comfort mode



Tab. 3 Menu 1



3.2.2 Menu 2



B Press – until L.2 is shown on the display.



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.


• 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.


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)


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



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


Tab. 4 Menu 2



3.2.3 Menu 3



B Press – until L.3 is shown on the display.



Code List for the Service function E.1 :


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


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


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


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 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.


CL on display ?

-->4.

no: --> 4.

4. Electronic board (PCB) is defect. B Switch off the boiler.


B Change the electronic board (PCB).

B Switch on the main voltage supply.


B END

4 Fault finding


5LBUS-Communication fault

Step Remedy

1. B Switch off the boiler.CP


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.


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.


--> 2.

2. B Check the connections between the

control (thermostat) and the boiler.

Is resistance very high ?

yes: B Switch on the boiler.


B Change the connection cable between boiler and

control (thermostat).


5L on display ? --> 2.

no: --> 3.






B END

4 Fault finding


CPSystem boiler: Cylinder / tank temperature sensor.

Step Remedy

1. Check the tank temperature sensor for

breaks or short circuits.


B Remove the NTC of terminal.

B Measure the electrical resistance of Tank-

NTC (in Ω) (see NTC tables).


yes: --> 2.

no: B Change the Sensor (NTC).


CP on display ?

-->2.



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.


CP on display ?

-->4.

no: --> 4.






B END

4 Fault finding


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 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.


3Y ? -->2.

no: B Connect the diff. pressure switch again.


-->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.


3Y ? -->3.

no: -->3.

3. Check the low voltage cable for damages

or open circuit.


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.


3Y ? --> 4.

no: --> 4.






B END

4 Fault finding


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.


3C ? -->2.

2. Is fan cable wrong ?



B Check the fan connection cable.

Is there open circuit ?

yes: B Chang the fan cable.



3C ? -->3.

no: -->3.

3. Is fan defect ? yes: B Switch off the boiler.


B Change the fan.



3C ? --> 4.

no: --> 4.






B END

4 Fault finding


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 ?


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).


2E ? --> 2.

no: --> 2.

2. Check the manometer and manometer

pipe. Is it defect or blocked ?


B Change the manometer.

B Fill the system with 8Ywater (>1 bar).


2E ? --> 3.

no: --> 3.

3. Check the expansion vessel precharge

pressure. Is it correct ?

yes: -- > 4.


B Correct the pressure. If necessary, change the

expansion vessel.

B Check the system pressure, if necessery correct it.


2E ? --> 4.

4. Check the water pressure switch and the connection cable for damages, blockage or open circuit. Is it correct ?

yes: -- > 5.


B Change the water pressure switch or correct the

cable connection.

B Fill the system with water (>1 bar).


2E ? --> 5.

4 Fault finding







B END

2EHeating system charge pressure is too low (<0.5 bar). Water pressure switch is triggered.

Step Remedy

4 Fault finding


8YExternal switching contact triggered.

Step Remedy


Is the bridge in connection terminal

installed ?

yes: --> 2.

no: B Install the bridge in


8Y ? --> 2.



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.



8Y ? --> 4.

no: --> 4.



B Check the connection cable.

Is there a brake or open circuit in

connection cable ?

yes: B Repair or change the connection cable.



8Y ? --> 5.

no: B Connect the cable again.



--> 5.

4 Fault finding


5. Is external temperature limiter (e.g.

TB1) triggered ?


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.


8Y ? --> 6.

no: --> 6.


Is the bridge in connection terminal

installed ?

yes: -- > 7.

no: B Install the bridge.


8Y ? --> 7.

7. External temperature limiter is locked or

defect ?



B Reset or change the external temperature limiter.



8YExternal switching contact triggered.

Step Remedy

4 Fault finding


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).


yes: --> 2.

no: B Change the Sensor.


4Y on display ?

-->2.

2. Check the NTC cables for damages.


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.


4Y on display ?

-->3.

no: --> 3.






B END

4 Fault finding


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 ?


B Connect the cables.


4C ? --> 4.

no: --> 4.


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.


4C ? --> 5.

no: B Connect the flue gas temperature limiter (STB) cables.


--> 5.

4 Fault finding


5. Are the heatexchanger temperature

limiter (STB) cables disconnected or

loose?

yes: B Switch off the boiler..



4C ? --> 6.

no: --> 6.


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).



4C ? --> 7.

no: B Connect the heat exchanger temperature limiter (STB)

cables.


--> 7.


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.


--> 8.


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.


--> 9.



Step Step

4 Fault finding



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).


--> 10.

10 Electronic board (PCB) is defect. B Switch off the boiler.





B END



Step Step

4 Fault finding


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 ?


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.


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.


6A ? --> 6.

no: --> 6.

4 Fault finding


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 ?


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).


6A ? --> 7.

7. Is the siphon blocked ? yes: B Clean or correct the siphon.

--> 8.

no: --> 8.

8. Is the gas valve robust ?


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.



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 Chech boiler for the gas leakege.


6A ? --> 9.


Step Remedy

4 Fault finding


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.


6A ? -->10.

11. Is the ignition cable connected correctly

to the control unit ?

yes: -->11.


B Connect the ignition cable correctly to the ignition

unit.



6A ? -->11.

12. Ionization cable damage ? yes: B Switch off the boiler.

B Change the ionization cable.


6A ? --> 12.

no: --> 12.

13. Check the ignition electrodes.


B Remove (dismount) the ignition

electrodes.

Is the electrode worn or dam-aged?

yes: B Change the ignition electrodes.



6A ? --> 14.

no: B Install the ignition electrodes.



6A ? --> 14.


Step Remedy

4 Fault finding



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.


6A ? --> 15.

no: B Install the ignition electrodes.



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.


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.


Step Remedy

4 Fault finding


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 ?


B Clean the main heatblock (WB6).


6A ? --> 20.

no: 6A ? --> 20.


B Change the electronic board (PCB)



B END.


Step Remedy

4 Fault finding


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.


B Is the ignition cable connection loose

or damaged ?

yes: B Change the ignition cable and the connection or if

possible fix it.


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.



B Is there any damage on securty

valve (gas valve) or connection

cable?

yes: B Change the connection cable to securty valve.


EC? --> 5.

no: --> 5.






B END.

4 Fault finding


6C 228Flame detected even when the burner is switched off.

Step Remedy


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.


6C ? -->2.

no: 6C ? --> 2.


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.


6C ? -->3.

no: 6C ? --> 3.

2. Electronic board (PCB). B Switch off the boiler.



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 END.

4 Fault finding


6C 306After switching gas off : Flame is detected.

Step Remedy

1. B Close the gas inlet valve.


B Replace the gas valve.

B Check the O2 values. If neceassary, correct it.

B Open the gas valve again. Check it for leaks.




6C ? --> 2.

2. Cable harness is defect. B Switch off the boiler.

B Change the cable harness.



6C ? --> 3.






B Not edilen servis ayarlarýný tekrar ayarlayýn.

4 Fault finding


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 Replace the low voltage cable.








(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.



B Remove the pump blockage or replace it.



B END.

4 Fault finding


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.



B Remove the pump blockage or replace it.



B END.

4 Fault finding


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.





Ignition too strong, or poor. B Check gas type.


B Check the power supply.

B Check the electrodes and cable, replace if required.



B For natural gas: Check external gas flow monitor,

replace.

B Check burner. Replace 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.


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



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


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


-20 95893

-15 72228

-10 548890 32506

10 19860

20 12486

30 8060

5.1.4 Buderus Outdoor Temperature Sensor



5.2 Gas conversion steps

Fig. 5 Gas conversion steps



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)



5.3.2 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



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



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 !



6.2 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.



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



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



6.6 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.



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



6.13 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


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


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


8.3 Venturi

Fig. 35 Differences between normal and high modulation (HM) venturis

8 Components


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.

Documents

Service Manual Gas Wallhung Boiler - Central Instal...Operation 2 Logamax PLus GB062 5 2.4 Setting the maximum flow temperature The maximum flow temperature can be set between 40 C