TECHNICAL TRAINING INVERTER-Y IntroductionTROUBLESHOOTING

Technical TrainingTechnical Training

TECHNICAL TRAININGTECHNICAL TRAININGINVERTER-YINVERTER-Y

IntroductionIntroductionTROUBLESHOOTINGTROUBLESHOOTING


CONTENTS

Error Indication Error Diagnosis & Troubleshooting GuideTools , Equipment


ERROR INDICATION


ERROR INDICATIONFrom indoor units

• When any error occurs, indoor LED display will keep blinking – green light:

• The blinking pattern not indicate error details • The error details have to retrieved from handset in error code form.

LED blinks here


ERROR INDICATION• Indoor : wireless handset -- G17 (McQuay) -- G18 (Acson) New -- GS01 (McQuay) New -- GS02 (Acson) : wired handset -- Netware 3 (standard for Ceiling Concealed)


ERROR INDICATIONUsing wireless handset G17/18 to retrieve error code:

1. For G17, hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds. For G18, Hold down TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section.

G18G17

ON TIMER CANCEL

OFF TIMER CANCEL


ERROR INDICATION

2. Then, press the same button repeatedly . A series of error code will appear until ID buzzer produces a long beep. The corresponding error code is indicated on the handset temperature display section.

3. ID unit buzzer will produce a long beep if the handset error code matched with unit error.

4. A short and two consecutive beeps is not the unit error.5. The code display will cancel itself if the button is not pressed for 1

minute.


Remove battery from remote controller

Replace battery again into remote controller

Press Mode & ON/OFF buttons together

The “ 00 “ will show at temperature section

Press Mode button to 5:00

Press ON/OFF once

Repeat the normal step for faulty diagnosis by remote controller step

ON/OFF button

Mode button

OFF TIMER CANCEL

button

ON TIMER CANCEL

button

ERROR INDICATIONHow to retrieved last state errorHow to retrieved last state error


ERROR INDICATIONUsing wireless handset GS01/02:

1. Hold down ON TIMER CANCEL or OFF TIMER CANCEL for 5 seconds until “ ” indication flashes on the handset temperature display section.

ON TIMER CANCEL

OFF TIMER CANCEL


ERROR INDICATION

2. Then, press the same button repeatedly. A series of error code will appear until ID buzzer produces a long beep. The corresponding error code is indicated on the handset temperature display section.

3. ID unit buzzer will produce a long beep if the handset error code matched with unit error.

4. A short and two consecutive beeps is not the unit error.5. The code display will cancel itself if the button is not pressed for

1 minute.


ERROR INDICATIONUsing wired handset Netware 3: The error will show at last 2 digits of the clock display. Netware 3 also can retrieved last state memory by : Press SLEEP & TIMER ACTIVE simultaneously and the error will

be flashed on the last 2 digits of the clock display.


ERROR INDICATION

No.ERROR CODE ERROR DESCRIPTION

5LCY 10/15 DR 20/25 CR

5LCY 10/15 ER

5LCY 30/40/50/60 CR

5MSY20/25/30 BR

1 00 Normal √ √ √ √

2 A1 INDOOR PCB ERROR √ √ √ √

3 A3 DRAIN PUMP ABNORMAL √ x √ √

4 A5 ANTIFREEZE PROTECTION √ √ x √

5 A6 INDOOR FAN MOTOR ABNORMAL √ √ √ √

6 A7 AIR SWING MOTOR LOCK √ x √ √

7 A8 ABNORMAL POWER SUPPLY VOLTAGE x x √ x

8 C4INDOOR HEAT EXCHANGER THERMISTOR SHORT/OPEN √ √ √ √

9 C9 INDOOR ROOM THERMISTOR SHORT/OPEN √ √ √ √

Error code description for Y-series inverter :

= will be explain in error diagnosis


ERROR INDICATION


5LCY10/15 DR 20/25 CR

5LCY 10/15ER

5LCY 30/40/50/60 CR

5MSY20/25/30 BR

10 E1 OUTDOOR PCB ERROR x √ √ √

11 E3 HIGH PRESSURE PROTECTION x x √ x

12 E4 LOW PRESSURE PROTECTION x x √ x

13 E5 COMPRESSOR OVERLOAD √ √ √ √

14 E6 COMPRESSOR LOCK /START-UP ERROR √ √ x √

15 E7 OUTDOOR FAN MOTOR LOCK √ √ √ √

16 E8 AC INPUT OVER CURRENT √ √ x √

17 E9 EXV ERROR x x √ x

18 EA 4 WAY VALVE ERROR x √ x √

19 F3 DISCHARGE PIPE OVERHEAT √ √ √ √



ERROR INDICATION

No.

ERROR CODE ERROR DESCRIPTION

5LCY10/15 DR 20/25 CR

5LCY 10/15 ER

5LCY 30/40/50/60 CR

5MSY20/25/30 BR

20 F6 HEAT EXCHANGER OVERHEAT √ √ x √

21 H0 COMPRESSOR SENSOR SYSTEM ABNORMAL x √ x √

22 H3 HIGH PRESSURE SWITCH ERROR x x √ x

23 H6 POSITION SENSOR ABNORMAL ( compressor ) √ √ x √

24 H8 AC CURRENT SENSOR ERROR √ √ x √

25 H9 OUTDOOR AIR THERMISTOR SHORT/OPEN √ √ √ √

26 J1 PRESSURE SENSOR ERROR x x √ x

27 J3COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT/OPEN/MISPLACED √ √ √ √

28 J5 SUCTION PIPE THERMISTOR SHORT/ OPEN x x √ X

29 J6OUTDOOR HEAT EXCHANGER THERMISTOR SHORT/ OPEN √ √ √ √



ERROR INDICATION


5LCY10/15 DR 20/25 CR

5LCY 10/15 ER

5LCY 30/40/50/60 CR

5MSY20/25/30 BR

30 J7SUBCOOLING HEAT EXCHANGER THERMISTOR SHORT/ OPEN x x √ x

31 J8 LIQUID PIPE THERMISTOR SHORT/ OPEN x x √ √

32 J9 GAS PIPE THERMISTOR SHORT/ OPEN x x x √

33 L1 OUTDOOR PCB ERROR x x √ x

34 L3ELECTRICAL BOX TEMPERATURE RISE ( compressor off ) √ √ x √

35 L4 HEAT SINK OVERHEAT ( compressor on ) √ √ √ √

36 L5 IPM ERROR / IGBT ERROR ( output over current ) √ √ √ √

37 L8ELECTRONIC THERMAL ( time lag-compressor signal disorder position) x x √ x



ERROR INDICATION


5LCY10/15 DR 20/25 CR

5LCY 10/15 ER

5LCY 30/40/50/60 CR

5MSY20/25/30 BR

38 P1 OPEN PHASE OR VOLTAGE UNBALANCE x x √ x

39 P4 HEAT SINK THERMISTOR SHORT / OPEN √ √ √ √

40 U0 INSUFFICIENT GAS √ √ √ √

41 U2 DC VOLTAGE OUT OF RANGE √ √ √ √

42 U4 COMMUNICATION ERROR √ √ √ √

43 UA INSTALLATION ERROR √ √ √ √

44 UH ANTIFREEZE PROTECTION IN OTHER ROOM x x x √



ERROR INDICATION

From outdoor unit : When unit error happen, the error will show at

outdoor display .

1) 5LCY-10/15DR, 20/25CR : 7 segment display 1) 5LCY-10/15DR, 20/25CR : 7 segment display

2) 5MSY-20/25/30BR : 5 LED light indicator2) 5MSY-20/25/30BR : 5 LED light indicator 3) 5LCY-30/40/50/60ER : 2 LED light indicator3) 5LCY-30/40/50/60ER : 2 LED light indicator 4) 5LCY-10/15ER : Nil4) 5LCY-10/15ER : Nil


ERROR INDICATION1. 5LCY-10/15 DR, 20/25CR: 7 segment display1. 5LCY-10/15 DR, 20/25CR: 7 segment display

The 7 segment display is located inside outdoor unit control The 7 segment display is located inside outdoor unit control panel beside the terminal block. Control panel cover have to panel beside the terminal block. Control panel cover have to remove before access to the 7 segment display.remove before access to the 7 segment display.

Overall photo for slx10,25

Overall photo for control box slx10,25


ERROR INDICATION When there is no error, compressor running frequency is displayed. When there is error, it flashes the error code as below:

Normal operationFlashing error code


ERROR INDICATION In addition, 7 segment also can be use to retrieve unit operating

condition such as running current, DC voltage, ambient temperature, indoor air temperature , etc.

By pressing the tact switch, the 7 segment will start to flash from “00”. Press again, it will show “ 01”

and subsequent running number shows the parameter number. Then, the 7 segment will flashing again showing the parameter measurement. When the 7 segment display is left untouched When the 7 segment display is left untouched for for 5 min5 min, the display will light off (Dim)., the display will light off (Dim).


ERROR INDICATION

Parameter Description

Compressor Actual Rotation

Compressor Target Rotation

DC Bus Voltage

Total Current (x10)

Outdoor Air Temperature

Outdoor Heat Exchanger Temperature

Compressor Discharge Temperature

Outdoor Heatsink Temperature

Indoor Air Temperature

Indoor Heat exchanger Temperature

EXV Opening

09 °C10 Pulse

07 °C

08 °C

05 °C

06 °C

03 A

04 °C

01 r/s

02 VDC

Parameter

NumberUnit/ range

00 r/s

For measurement of 125, the 7 segment will display as 25 first follow by 01


ERROR INDICATION2. 5MSY-20/25/30BR: 5 LED display at display board2. 5MSY-20/25/30BR: 5 LED display at display board

LED A – flashing GREEN LED indicates normal equipment condition.LED 1 - 4 – OFF condition of the red LED indicates normal equipment condition.LED 1-4 -- blinking indicates error.


ERROR INDICATIONError code for 5MSY :

GreenA 1 2 3 4◑ ● ● ● ● 00 NORMAL

UA INSTALLATION ERROR

UH ANTIFREEZE (OTHER ROOMS)

◑ ● ● ● ○ L4 HEAT SINK OVERHEAT

◑ ● ● ○ ● L5 IPM ERROR / IGBT ERROR

◑ ● ● ○ ○ U0 INSUFFICIENT GAS

◑ ● ○ ● ○ E8 AC INPUT OVER CURRENT

◑ ● ○ ○ ● E6 COMPRESSOR START-UP ERROR

◑ ● ○ ○ ○ U7 COMMUNICATION ERROR (OUTDOOR CONTROL PCB AND IPM PCB)

◑ ○ ● ● ● EA 4 WAY VALVE ERROR

◑ ○ ● ● ○ U2 DC VOLTAGE OUT OF RANGE

◑ ○ ● ○ ● E5 COMPRESSOR MOTOR LOCK / COMPRESSOR OVERLOADED

◑ ○ ● ○ ● F3 DISCHARGE PIPE OVERHEAT

◑ ○ ● ○ ○ A5 ANTIFREEZE (COOLING)

F6 HEAT EXCHANGER OVERHEAT

◑ ○ ○ ● ● H0 COMPRESSOR SENSOR SYSTEM ERROR

H6 COMPRESSOR FEEDBACK DETECTION ERROR

H8 AC CURRENT SENSOR ERROR

H9 OUTDOOR AIR THERMISTOR SHORT/OPEN

J3 COMPRESSOR DISCHARGE PIPE THERMISTOR SHORT / OPEN / MISPLACED

J6 OUTDOOR HEAT EXCHANGER THERMISTOR SHORT/ OPEN

J8 LIQUID PIPE THERMISTOR SHORT/ OPEN

J9 GAS PIPE THERMISTOR SHORT/OPEN

P4 HEAT SINK THERMISTOR SHORT / OPEN

◑ ○ ○ ● ○ L3 OUTDOOR CONTROL BOX OVERHEAT

◑ ○ ○ ○ ● E1 OUTDOOR PCB ERROR

◑ ○ ○ ○ ○ E7 OUTDOOR DC FAN MOTOR LOCK

DescriptionRedLED INDICATION

Legend◑ Blinks● Off○ On


ERROR INDICATION3. 5LCY-30/40/50/60ER: 2 LED light indicator3. 5LCY-30/40/50/60ER: 2 LED light indicator LED HAP – flashing GREEN LED indicates normal condition. LED HAP – OFF condition indicates power supply abnormal or faulty outdoor PCB LED H3P – OFF condition of the red LED indicates normal condition. LED H3P – ON condition indicates protection devices activate


OTHERS 5LCY30/40/50/60 display PCB guide :5LCY30/40/50/60 display PCB guide :

5LCY30 ER

5LCY 40/50/60 ER

Display PCB


ERROR INDICATION

4. 5LCY-10/15ER: Nil4. 5LCY-10/15ER: Nil• For K-series inverter, the outdoor will not have error

indicator, have to refer to indoor when error happen.


ERROR DIAGNOSIS


ERROR DIAGNOSIS

Error message : A1

Method of malfunction detection : Evaluation of zero- cross detection of power supply by indoor unit

Malfunction decision condition : When there is no zero-cross detection in 10 seconds continuously.

causes : 1.) Faulty indoor PCB

2.) Faulty connector connection at indoor

ERROR A 1 : Indoor PCB error

Troubleshooting flow :

Turn off unit

Any sign of loose or abnormal Connect correctly and operate again

Replace indoor PCB and operate again

YES

NO

Check indoor PCB connector conditions( including PCB to terminal block and all PCB wire connector)


ERROR DIAGNOSIS

Error message : A3

Method of malfunction detection : Evaluation of water level upper limit and float switch condition

Malfunction decision condition : When water level reach upper limit and float switch turn off

causes : 1.) Faulty drain pump or float switch

2.) Improper drain piping work or drain pipe blockage

ERROR A 3 : Drain pump abnormal (for ceiling cassette unit)


Turn off unit

Any sign of loose or abnormal Connect correctly and operate again

Restart back operation

YES

NO

Check drain pump connector connect to indoor PCB


ERROR DIAGNOSISERROR A 3 : Drain pump abnormal (for ceiling cassette unit)

Drain pump works ? Change drain pump

Drainage system problem or blockage

YES

NO

Drain water level abnormal high after sometimes ?

YES

NOFloat switch connect to

the PCB?

NO

Connect float switch

YES

Check float switch have continuity?

YES

NO

Change float switch

Change indoor PCB


ERROR DIAGNOSIS

Error message : A5

Method of malfunction detection : Freeze-up protection control during cooling by detection of indoor heat exchanger thermistor.

Malfunction decision condition : When indoor heat exchanger thermistor less than 0 ◦ C .

causes : 1.) Indoor air filter , heat exchanger block .

2.) Indoor air short circuit .

3.) Indoor coil thermistor faulty, Indoor PCB faulty.

ERROR A 5 : Antifreeze Protection


Any air short circuit ? Provide sufficient air passage

Check intake air filter

YES

NO

Check indoor air flow


ERROR DIAGNOSIS

Is it very dirty ? Clean the air filter

Check indoor coil thermistor resistance

YES

NO

YES

ERROR A 5 : Antifreeze Protection

Check the dust accumulate at indoor coil

Is it very dirty ? Clean the indoor coil

Does it conform to the thermistor accuracy table?

YES

Change indoor PCB

NO

Change indoor coil thermistor

# Refer to thermistor resistance table


ERROR DIAGNOSISError message : A6

Method of malfunction detection : Rotation speed detected by the indoor PCB during fan motor running is used to determine this error.

Malfunction decision condition : When the detected motor rotation speed does not reach the target rotation speed by the program

causes : 1.) Indoor fan motor winding short, or the motor lead wire broken

2.)Indoor PCB faulty.

ERROR A 6 : Indoor fan motor abnormal



ERROR DIAGNOSISERROR A 6 : Indoor fan motor abnormal

Does it rotate ?

Turn off power supply and rotate fan by hand

YES

NO

Change fan motor

Turn ON and run fan

Does it rotate ?

YES

NO

Change fan motor

Change PCB


OTHERS : Inverter–Y series fan motor:Inverter–Y series fan motor:

5LCY 10/15 DR

5LCY 20/25 CR

5LCY 10/15 ER

5MSY 20/25/30 BR

5LCY 30/40/50/60 ER

Outdoor AC AC DC DC DC

Indoor WM AC DC DC ------ -------

CC,CK, CM

AC AC ------ ------- --------


ERROR DIAGNOSISError message : A8

Method of malfunction detection : Checking of input voltage

Malfunction decision condition : When the voltage detected out of range of ± 10 % of 240 V.

causes : 1.) Power supply problem or blackout.

2.) Wiring problem or Indoor PCB faulty.

ERROR A 8 : Abnormal power supply voltage


Any problem as describe above?

Possible of external factor such as blackout

YES

NO

Check the condition of power source :1.) voltage is 220V-240V± 10% 2.) Check there is power open phase or wiring problem3.) Check power supplier fluctuation within 6V

Correct the supply problem


ERROR DIAGNOSIS

Error message : C4, C9

Method of malfunction detection : Temperature detected by the thermistor

Malfunction decision condition : When the thermistor input is > 4.96V or <0.04V during compressor operation.

causes : 1.) Thermistor , connector faulty.

2.) Indoor PCB faulty.

ERROR C4, C9 : INDOOR HEAT EXCHANGER , ROOM THERMISTOR SHORT/OPEN


Normal ?

Check thermistor resistance value

No

Yes

Check the thermistor connector condition

Correct the problem

# Refer thermistor resistance table

Normal ?

No

Replace thermistor

Replace PCB


ERROR DIAGNOSIS

( 5WMY10/15 JR ) Location of indoor coil thermistor:

ERROR C4, C9 Indoor heat exchanger thermistor

CN COIL


For room thermistor : WMY-J series, K-series = Chips type thermistor mount to the PCB. other indoor - copper sensor attached to return air location

RTH201

Unit design with air opening at the front panel to allow

sufficient space for air flow & measurement

Air intake gap for room temperature sensing

ERROR C4, C9 Indoor room thermistor

ERROR DIAGNOSIS


ERROR DIAGNOSIS

Error message : E3

Method of malfunction detection : Protection device check high pressure switch continuity

Malfunction decision condition : When the high pressure switch is turn off at 4MPa. ( 580 psi ) , turn on at 3 MPa ( 435 psi )

causes : 1.) faulty high pressure switch , connector or wire harness

2.) Indoor filter , outdoor coil dirty.

3.) Outdoor fan not running, unit overcharge, stop valve is closed.

ERROR E3 : High pressure protection (for 5LCY 30-60 ER)


Stop valve open?No

Yes

Check the installation condition

Open the stop valve

High pressure switch connect to outdoor PCB?

NoConnect correctly

Turn off unit. Wait for compressor stop 10 minutes


ERROR DIAGNOSISERROR E3 : High pressure protection (for 5LCY30-60 ER)

Have continuity for high pressure switch?

No

Yes

Replace high pressure switch

Check the abnormal unit high pressure condition

Have abnormal condition? Correct the abnormal condition

No

Yes

Replace outdoor PCB

# Refer how to check high pressure condition


Outdoor high pressure condition check :Outdoor high pressure condition check :


Where a wall or other obstacle is in the path of outdoor unit’s intake or exhaust airflow

Follow this installation guidelines to avoid air short circuit

Installation condition : 5LCY10/15 DR

ERROR DIAGNOSIS


ERROR DIAGNOSIS

Error message : E4

Method of malfunction detection : Protection device check low pressure switch continuity

Malfunction decision condition : When the pressure detected is < 0.12 MPa ( 17 psi )for continues 5 minutes.

causes : 1.) faulty low pressure switch , faulty outdoor PCB

2.) Stop valve closed, unit leakage or refrigerant not enough.

3.) Abnormal refrigerant piping system ,faulty EXV

ERROR E4 : Low pressure protection (for 5LCY30-60 ER)


Stop valve open?No

Yes

Open the stop valve

Low pressure switch connect to outdoor PCB?

NoConnect correctly

Measure the voltage between low pressure switch

Yes

# Refer how to check low pressure voltage


ERROR DIAGNOSISERROR E4 : Low pressure protection (for 5LCY30-60 ER)

Relation between Voltage and pressure follow the graph?

No

Yes

Change the low pressure switch

Correct refrigerant system ( gas shortage, leakage or piping block )

Yes

# Refer how to check low pressure condition

Is the refrigerant pressure abnormally low?

No

Change the Outdoor PCB


Outdoor low pressure condition check :Outdoor low pressure condition check :


Outdoor pressure sensor condition check :Outdoor pressure sensor condition check :

For 5LCY30-60 ER pressure switch:

PH = detected pressure ( MPa ) V = Output Dc voltage

PH = 1.38 V -0.69


ERROR DIAGNOSIS

Error message : E5

Method of malfunction detection : Detected by compressor overload

Malfunction decision condition : When compressor overload activate twice. If active once, will be reset if not happen in following 60 mins.

causes : 1.) Stop valve , EXV defective

2.) 4wv , outdoor PCB defective

3.) Refrigerant shortage, water mixed in the piping

ERROR E5 : Compressor overload


Turn off unit. Disconnect Compressor wire hardness

( U,V,W )

Resistance normal?No

Change compressor

Check compressor winding resistance

Yes

# Refer compressor resistance table


ERROR DIAGNOSISERROR E5 : Compressor overload

Compressor stop without running?

No

Change outdoor PCB

Connect back wire and turn on unit

Yes

Compressor run for sometimes.Check EXV, stop valve, refrigerant level, 4WV and

water in the piping, installation condition


Inverter –Y series Compressor spec:Inverter –Y series Compressor spec:5LCY 10/15 DR 5LCY 20/25 CR 5LCY 10/15 ER 5MSY 20 BR 5MSY25/30 BR 5LCY 30 ER 5LCY 40/50/60 ER

Compressor type

Rotary Rotary (swing)

Rotary (swing)

Rotary (swing)

Rotary (swing)

rotary(swing)

scroll

Compressor manufacturer

Panasonic Daikin Daikin Daikin Daikin Daikin Daikin

Compressor model

5RS102XBJ01 2YC32GXD 1YC23AEXDA 2YC36BXD 2YC45BXD 2YC63DXD JT-100G-VD

Compressor winding resistance ( U,V,W ) -Ω

0.858 1.18 1.764 0.828 0.787 0.31 0.31

motor 6 pole brushless motor

4 pole brushless motor



General guide :1) Resistance of compressor winding < 10 Ω consider Ok 2) All 3 terminal resistance value must be same.

ERROR DIAGNOSIS


Other : Inverter –Y series Compressor spec :Inverter –Y series Compressor spec :

4 poles motor6 poles motor


ERROR DIAGNOSIS

Error message : F3

Method of malfunction detection : Compressor discharge thermistor is checked with discharge temperature control.

Malfunction decision condition : When compressor discharge temperature is at abnormal high level or rise suddenly.

E.g. : 110 -120 degree C varies by model. 100-110 degree C when compressor frequency low.

causes : 1. Faulty discharge thermistor, compressor, Outdoor PCB

2. Refrigerant shortage

ERROR F3 : Discharge pipe overheat


Any wire damage, not insert to connector?

No

Correct wiringYes

Check discharge thermistor condition

Check discharge thermistor resistance value # Refer resistance table : for discharge thermistor, different spec.


ERROR DIAGNOSISERROR F3 : Discharge pipe overheat

Resistance value Normal?

Yes

Change discharge thermistorNo

Check refrigerant level, compressor, EXV & stop valve.


ERROR DIAGNOSIS

Error message : F6

Method of malfunction detection : Detect heat exchanger ( outdoor coil ) temperature during cooling mode .

Malfunction decision condition : Activate when outdoor coil temperature exceed 65 º C. Error reset when temperature drop to 50º C.

causes : 1.) Faulty outdoor coil thermistor, faulty outdoor PCB

2.) Installation space not enough, hot air short circuit, fan motor not running , coil dirty

ERROR F6 : Heat exchanger overheat


Any abnormal?

No

Change outdoor location, clean outdoor coil.

Yes

Check outdoor installation condition

Check outdoor fan motor


ERROR DIAGNOSISERROR F6 : Heat exchanger overheat

Resistance normal?

Yes

Change fan motorNo

Check outdoor coil thermistor resistance

Change outdoor PCB

Fan motor running smoothly?

NoChange thermistor

Yes

# Refer resistance table


ERROR DIAGNOSIS

Error message : F6

Method of malfunction detection : Detect the compressor current and voltage before compressor start.

Malfunction decision condition : Detected DC voltage is too low or too high. No current detected when compressor start

causes : 1.) Outdoor PCB, compressor problem

2.) Compressor wrong wiring, reactor not connected.

ERROR H0 : Compressor sensor system abnormal


Any abnormal?

No

Connect back reactorYes

Check reactor connection

Check reactor resistance


ERROR DIAGNOSISERROR H0 : Compressor sensor system abnormal

<10 Ω ?

Yes

Change reactor

No

Check reactor resistance # disconnect the reactor wire and measure resistance between terminal

Check compressor resistance

<10 Ω ? Change compressor

Yes

Change outdoor PCB

No


ERROR DIAGNOSIS

Error message : H9,J3,J5,J6,J7,J8,J9,P4

Method of malfunction detection : Detect the temperature detected by the thermistor.

Malfunction decision condition : When thermistor is disconnected or short circuit during operation.

J3 is judged when compressor discharge thermistor temperature is smaller compare to the condenser

thermistor temperature.

causes : 1.) Thermistor, connector problem

2.) Outdoor PCB problem

ERROR H9, J3,J5,J6,J7,J8,J9,P4 : Outdoor Thermistor related abnormal


Thermistor disconnected or loose?

No

Connect thermistor back

Yes

Check connector for the thermistor with error

Check thermistor resistance # Refer thermistor spec and the table.


ERROR DIAGNOSISERROR H9, J3,J5,J6,J7,J8,J9,P4 : Outdoor Thermistor related abnormal

Resistance value normal?No

Change thermistor

Yes

Change outdoor PCB

H9 :Outdoor air thermistorJ3 : Compressor discharge thermistorJ5 : Suction pipe thermistor (for 5LCY30-60 model) J6 : Outdoor heat exchanger thermistorJ7 : Sub-cool heat exchanger thermistor (for 5LCY 30-60 model)J8 : Liquid pipe thermistor (for 5LCY30-60, 5MSY20-30)J9 : Gas pipe thermistor (for 5MSY20-30)P4 : Heat sink thermistor (for 5MSY20-30, 5LCY10-15ER, 5LCY10-15DR)


Inverter –Y series Thermistor spec :Inverter –Y series Thermistor spec :

5LCY 10/15 DR

5LCY 20/25 CR

5LCY 10/15 ER

5LCY 30/40/50/60 ER

5MSY 20/25/30 BR

Indoor WM 10K 10K 20K ------- ------

CC,CK, CM

10K 10K ------ -------

Outdoor 10K 10K 20K 20KExcept fordischarge pipe thermistor =230K(Refer 20k table)

20K

ERROR DIAGNOSIS


How to check thermistor resistanceHow to check thermistor resistance

Use multi meter to check the thermistor resistance value.


At 25CResistance value: 10 k

Inverter–Y series Thermistor spec : (10 KInverter–Y series Thermistor spec : (10 KΩΩ))


At 25CResistance value: 20 k

Inverter–Y series Thermistor spec : (20 KInverter–Y series Thermistor spec : (20 KΩΩ))


Discharge thermistor spec for 5LCY 30/40/50/60

Inverter–Y series Thermistor spec : (discharge thermistor)Inverter–Y series Thermistor spec : (discharge thermistor)


For Outdoor 5LCY10/15 DR :

All thermistor ( discharge, air, coil ) share a same connector and connect to PCB

Outdoor air thermistor with PVC protection sleeve

Outdoor discharge , heat exchanger

Thermistor : copper type

ERROR DIAGNOSIS


ERROR DIAGNOSIS

Error message : L3

Method of malfunction detection : Detect the temperature of heat sink when compressor off.

Malfunction decision condition : Heat sink temperature >80 º C( MSY ), > 93 º C ( K-series ) when compressor off. Error reset when

temperature drop < 70 º C.

causes : 1.) Outdoor fan , PCB problem

2.) Heat sink thermistor, connector problem

ERROR L3 : Electrical Box temperature rise (compressor off)


ERROR DIAGNOSISERROR L3 : Electrical Box temperature rise (compressor off)Troubleshooting flow :

Error again ?

No

Check outdoor fan

Yes

Turn off the unit and turn on back after 20 mins

Check heat sink thermistor resistance

# Refer thermistor spec and the table.

Outdoor fan functioning?

No

Yes

Change outdoor fan motor

Heat sink dirty?

Yes

Clean the heat sink

NoCheck installation

condition

Heat sink temperature > 80 ºC ?

Change thermistor

No

Yes

Resistance normal?

No

Change outdoor PCB

Change heat sink or check outdoor fan condition


ERROR DIAGNOSIS

Error message : L4

Method of malfunction detection : Detect the temperature of heat sink when compressor on.

Malfunction decision condition : Heat sink temperature >103º C( MSY ), > 93 º C ( K-series ) when compressor on. Error clear when

not happen in the following 60 mins.

causes : 1.) Outdoor fan , PCB problem

2.) Heat sink thermistor, connector problem

ERROR L4 : Heat sink overheat (compressor on)


ERROR DIAGNOSISERROR L4 : Heat sink overheat (compressor on)Troubleshooting flow :

Error again ?

No

Check outdoor fan

Yes


Check heat sink thermistor resistance

# Refer thermistor spec and the table.

Outdoor fan functioning?

No

Yes

Change outdoor fan motor

Heat sink dirty?

Yes

Clean the heat sink

No

Check installation condition

Heat sink temperature > 93 ºC ?

Change thermistorNo

Yes

Resistance normal?

NoChange outdoor

PCB

Change heat sink or check outdoor fan condition # Make sure condition of silicon grease apply to IPM , and diode bridge is good.

Yes


Application of silicon grease Application of silicon grease to IPM board and diode bridge :


Heat sink

IPM board

Bad condition of silicon grease can cause Bad condition of silicon grease can cause L4 ( heat sink overheat )L4 ( heat sink overheat ) L5 ( IPM error )L5 ( IPM error )

Silicon grease

ERROR DIAGNOSIS


For Outdoor 5LCY10/15 DR : The heat sink thermistor is screw and connect the PCB ( port : CN HTSK )

ERROR DIAGNOSIS


ERROR DIAGNOSIS

Error message : L5

Method of malfunction detection : Detect the output current that flows into IPM board inverter DC section.

Malfunction decision condition : When over current has been detected by IPM and feedback MCU.

A position signal , speed signal error happen during compressor running.

causes : 1.) Over current due to IPM board, internal wiring, wire connector loose, PCB problem

2.) Over current due to stop valve close, compressor failure, abnormal supply voltage.

3.) Over current due to silicon grease not apply to the IPM board contact point properly.

ERROR L5 : IPM (inverter power module) / IGBT error (output over current)


Stop valve fully open?

No

Open stop valve

Yes

Error again ?

Yes

No Continue monitor for supply voltage, discharge, suction pressure, compressor overload, Check for silicon grease at IPM condition


ERROR DIAGNOSISERROR L5 : IPM / IGBT error (output over current)

Turn off the unit and disconnect compressor U,V,W wire

No

Check compressor winding resistance

Yes

Resistance normal Change compressor

Change the Outdoor PCB


ERROR DIAGNOSISError message : L5

Method of malfunction detection : Checking compressor running frequency and input current.

Checking compressor discharge temperature versus target discharge temperature and EXV opening.

Malfunction decision condition : When input current is smaller compare to target current.

When compressor discharge temperature is higher compare to target discharge temperature and the EXV

opening is high( >450 pulse )

causes : 1.) Refrigerant shortage, unit leakage

2.)Refrigerant piping system block,

3.) EXV defective, thermistor disconnected, stop valve closed

ERROR U0 : Insufficient gas


ERROR DIAGNOSISERROR U0 : Insufficient gas

Check for EXV function

Any thermistor disconnected?

No

Connect backYes

Stop valve closed?

Yes

NoChange EXV

YesOpen stop valve

EXV functioning?

No

Check for refrigerant level # How to check refrigerant level


ERROR DIAGNOSISERROR U0 : Insufficient gas

Change thermistor, outdoor PCB or compressor

NoCheck for leakage

Yes

Any leakage?

No

Add refrigerant

Yes

Refrigerant level normal?

Repair the leak point


How to check refrigerant levelHow to check refrigerant level

- To set unit run in force cooling (unit will run at rated compressor fixed frequency).

- Connect pressure gauge outdoor suction service valve and measure the suction pressure.

- Ideal suction pressure level : 125-150 psi (depends on the outdoor ambient temperature).


- Press and hold on the ID ON/OFF button for 5-9 s when unit is in standby mode.

- Set to high fan mode and temperature at 16 °C using remote controller

Press & hold

ERROR DIAGNOSIS


ERROR DIAGNOSISError message : U4

Method of malfunction detection : Data received from the outdoor unit in indoor unit -outdoor unit signal transmission is checked whether it is

normal.

Malfunction decision condition : When the data send from the outdoor cannot be received in ( XX second ) or the data content is abnormal.

causes : 1.) Faulty indoor, outdoor PCB

2.)Indoor-outdoor signal wire line wiring error ( loose or broken ).

3.) External noise, power supply waveform disturbance

ERROR U4 : Communication error (between indoor and outdoor)

Check indoor-outdoor wiring connection

Any wiring problem?

No

YesCorrect the wiring

Check outdoor unit PCB “ status LED “

#Refer wiring check


ERROR DIAGNOSIS

NoLED light on?

ERROR U4 : Communication error (between indoor and outdoor)

Change outdoor PCB

Yes

Check voltage of indoor-outdoor connection between No.1-No.3 and No.2-No.3

Voltage =0?Yes

Replace connection between indoor and outdoor

No

Check power supply waveform

Any disturbance?

No

YesFind the source of power disturbance and correct it

Replace indoor unit PCB , external noise ( interference )

#Refer supply waveform check


Maximum communication wire length: 50 meters Make sure the recommended type of wire is used Check for loose connection

Wiring – Wiring – How to check communication wire :How to check communication wire :


Power supply disturbance checkPower supply disturbance check

Using power analyzer to check the supply voltage


ERROR DIAGNOSISError message : UA

Method of malfunction detection : Detected different type of transmission signal ( for different model )

Malfunction decision condition : When detected different coupling of indoor-outdoor unit.

causes : 1.) Outdoor and indoor unit not match ( wrong model , horsepower, )

2.)Wrong indoor-outdoor PCB.

3.) External noise, power supply waveform disturbance

ERROR UA : Installation error

1. X-series inverter unit can not couple with Y-series inverter

2. K-series inverter unit can not couple with X, Y series inverter and only available in 1.0 ,1.5 Hose power.


5WMY10/15 JR

5LCY10/15 DR

ERROR DIAGNOSISERROR UA : Installation error


TOOLS & EQUIPMENT


TOOLS & EQUIPMENT Digital clamp meter

Digital multi-meter

: to check resistance , voltage, current,

wire continuity

AC CURRENT

RESISTANT

AC VOLTAGE


TOOLS & EQUIPMENT

Manifold (pressure) gauge and hoseGauge :

High side :800 psig

Low side :250 psig for low-side

(500 low-side retard)

Hose : rated 800 psig


TOOLS & EQUIPMENT

Refrigerant tank

Weighing machine

Thermocouple

Test pen


TOOLS & EQUIPMENTReplacement parts : Indoor/outdoor PCB

5LCY10/15DR –Outdoor PCB5WMY10/15JR –indoor PCB


TOOLS & EQUIPMENT

Brazing equipment

Vacuum pump & vacuum meter.


THANK YOU&

Q & A

Documents

TECHNICAL TRAINING INVERTER-Y IntroductionTROUBLESHOOTING