LG THERMA V AHNW16606B0 Service Manual Download Page 60

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Title

Cause of error

Check point & Normal condition

D-pipe sensor (Inverter)

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Air sensor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Condenser Mid-pipesen-
sor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Suction Pipe sensor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Condenser Out-pipe sen-
sor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Check Point

1. Estimate the resistance of each sensor.(Unplugged)

2. Check the value of the resistor of thermistor.

D-pipe sensor (Inverter)

: Normal Value of the resistor is 200kΩ at 25℃

Air sensor

: Normal Value of the resistor is 10kΩ at 25℃

Cond. Mid-pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Suction pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Condenser Out-pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Is sensor connected to

PCB(Inverter) correctly?

Is sensor value correct?*

Connect sensor to PCB(Inverter)
correctly

Replace sensor

Replace corresponding
PCB(Inverter)

Yes

Error Diagnosis and Countermeasure Flow Chart

Summary of Contents for THERMA V AHNW16606B0

Page 1: ... HEAT PUMP www lg com Before servicing the unit read the safety precautions in general SVC manual Only for authorized service personnel GENERAL CONFIDENTIAL Copyright 2017 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...ce 14 5 Piping Diagrams 15 6 Wiring Diagrams 16 7 Exploded View 21 8 Model Information 29 9 Replacement Procedure for Compressor 31 10 Caution for Assembling Outdoor Panels after Test Run 32 11 Trouble shooting Guide Indoor Unit 33 12 Trouble shooting Guide Outdoor Unit 40 Content ...

Page 3: ...evice according to its use The installer is a person professionally trained for performing hardware and or electro installation work and mounting of the device Incorrect use of the device can lead to damage of the device property or injury to the user or main tenance worker To reduce risk the manual points out important information with the use of sym bols 1 1 Symbol 1 General To prevent injury to...

Page 4: ...nditioner There is risk of fire or failure of product Use the correctly rated breaker or fuse There is risk of fire or electric shock Before beginning the service procedure it is necessary to read the service manual The installation of the device has to be performed in accordance with the manual otherwise the manufacturer does not acknowledge the warranty Any remaking or replacement of original co...

Page 5: ...hose specified by LGE are used fire or explosion may result Ventilate before operating air conditioner when gas leaked out It may cause explosion fire and burn Securely install the cover of control box and the panel If the cover and panel are not installed securely dust or water may enter the outdoor unit and fire or electric shock may result Operation Do not damage or use an unspecified power cor...

Page 6: ...damaged fin may result in degradation of capacity When installting the unit in a hospital communication station or similar place provide sufficient protection against noise The inverter equipment private power generator high frequency medical equipment or radio communication equipment may cause the air conditioner to operate erroneously or fail to operate On the other hand the air conditioner may ...

Page 7: ...the heat exchanger fins Doing so may cut your fingers When transporting the outdoor unit suspending it at the specified positions on the unit base Also support the outdoor unit at four points so that it cannot slip sideways Safely dispose of the packing materials Packing materials such as nails and other metal or wooden parts may cause stabs or other injuries Tear apart and throw away plastic pack...

Page 8: ... C Depending on the external air water unit Secondary side heat sink water Min Max pressure in the system MPa 0 05 0 3 0 5 3 bar Recommended dimensions of pipes of the device 4 DN 25 Heating Rated flow 3 m3 h Min 1 m3 h Pressure drop at rated flow kPa 10 Range of operation min max water temperature C 25 58 Cooling Range of operation min max water temperature C 7 25 Pipe connections for the water c...

Page 9: ...t be dimensioned in such a way that it ensures rated flow through the device 4 This is true for pipe connections of suitable dimensions and joint distance of up to 20m Pipe dimensions and types of pumps must always be verified or determined by the designing engineer of electrical installations Circulation pumps must be dimensioned in such a way so as to ensure rated voltage see table through the d...

Page 10: ...d Power Level Heating dB 69 Liquid Piping Connection Type Flare Outer Diameter mm inch Ø 9 52 3 8 Gas Piping Connection Type Flare Outer Diameter mm inch Ø 15 88 5 8 Piping Length Outdoor Unit Indoor Unit Minimum m 3 Standard m 7 5 Maximum m 50 Height Difference Outdoor Unit Indoor Unit Maximum m 30 30 Additional Refrigerant Charge g m 40 Dimensions Unit W x H x D mm 950 x 1 380 x 330 Packed Unit ...

Page 11: ...c Motor Hermetic Motor Hermetic Motor Model GPT442MAA GPT442MAA GPT442MAA Quantity EA 1 1 1 Displacement cm3 Rev 44 2 44 2 44 2 Capacity kW 13 92 13 92 13 92 Compressor Motor Type Brushless Brushless Brushless Quantity EA 1 1 1 Rated Output W 4 000 4 000 4 000 Refrigerant Type R410A R410A R410A Charge g 2 300 2 300 2 300 Control EEV EEV EEV Refrigerant Oil Type FVC68D FVC68D FVC68D Charged Volume ...

Page 12: ...essor Type Hermetic Motor Hermetic Motor Hermetic Motor Model GPT442MAA GPT442MAA GPT442MAA Quantity EA 1 1 1 Displacement cm3 Rev 44 2 44 2 44 2 Capacity kW 13 92 13 92 13 92 Compressor Motor Type Brushless Brushless Brushless Quantity EA 1 1 1 Rated Output W 4 000 4 000 4 000 Refrigerant Type R410A R410A R410A Charge g 2 300 2 300 2 300 Control EEV EEV EEV Refrigerant Oil Type FVC68D FVC68D FVC6...

Page 13: ...dependent operation O modbus communication between outdoor unit and indoor unit O heating loops control 1 direct 1 mixing O DHW heating O Cooling O Screet drying O Gas oil boiler heat utilisation hybrid function O Weather dependent heating heating curve O Web cloud service connectin with web module option 2 extra heating loops 2 mixings with expansion module optoin Pool cooling heating with expans...

Page 14: ... 14 4 Pump Hydraulic Performance Pump capacity AHNW16606B0 Pump model Yonos PARA RS 25 7 0 PWM1 Ku WARNING Selecting a water flowrate outside the curves can cause damage to or malfunction of the unit ...

Page 15: ...ing pump 3 DHW Hot water C Electric flow heater 4 DHW Circulation D 5 DHW Cold water E Condenser 6 ODU gas pipe F 3 Way Valve 7 ODU liquid pipe G DHW tank 8 Mg Annode TIC Temperature sensor 9 PIC Pressure indicator 10 Safety group Pressure indicator safety valve automatic air vent FZAL Flow switch ...

Page 16: ... 16 6 Wiring Diagrams Indoor Unit Model AHNW16606B0 ...

Page 17: ...ctrical heater 2 Tree way valve for switching between heating and DHW 3 Basic input output module MD1 4 D4 Flow switch 5 Web module OPTIONAL TW Modbus Communication with PLC TX Modbus Not in use Ethernet Internet connection 6 A6 Temperature sensor of the supply pipe 7 Q3 Main circulation pump 8 A1 Temperature sensor of the return line 9 Process module PLC WM Communication with the Web module TEX M...

Page 18: ... 18 Outdoor Unit Models AHUW146A2 Models AHUW096A3 ...

Page 19: ... 19 Models AHUW166A3 AHUW146A3 AHUW126A3 ...

Page 20: ... 20 Models AHUW168A3 AHUW148A3 AHUW128A3 ...

Page 21: ... 21 552207 265020 349001 552120M 269300 W6920 249940D 237900 235450 349001 249950 552202 158580 552206A 148391 165020 552120F 268711 7 Exploded View Indoor Unit ...

Page 22: ...4147030 1 EMV DRIVE 552206A Valve Drain 2222000079611 COV34147031 1 DRAIN VALVE 235450 Display Assembly 2222000051655 COV34147032 1 PLC 237900 Window Display 2222000044503 COV34147034 1 MEMBRANE KEYBOARD W6920 Relay Contact 2222000082550 COV34147036 1 ELECTRICAL CONTACTOR 249940D Case Control 2222000023348 COV34147037 1 RELAY PANEL 268711 PCB Assembly Power 2222000077945 COV34147038 1 POWER SUPPLY...

Page 23: ... 546810B 549610 554031 237204 554031 148000 552203B 552203A 552116 552117 548490 55211G W6200B W6200A W6640 649950 435300 552111 552115 552120A 447910 554160 435513 430410 137213 237205 437212 135500B 268711A 435301 349480 237202 W4986A W4986B 561410 661400 152503 ...

Page 24: ... W6631A Harness Multi Compressor Leadwire W6631F Harness Single Base Pan Heater Connector 250V 1A W6631G Harness Single Sump Heater Connector 250V 1A 553000A Heater Sump Base Pan Heater 553000B Heater Sump Sump Heater W50010 Accessory Assembly Damper Drain Nipple Accessory W0FZZA Fuse Time Delay Power Supply Fuse 250V 35A W0FZZB Fuse Time Delay PCB Fuse 250V 3 15A 165000 Sensor Pressure High Press...

Page 25: ...410 268711C W0FZZB 152503 55211E 148000 552203B 552203A 661400 550140 W4986B W4986A 552200 437212 237205 135500 Location No Description Information Etc 263230D Thermistor Assembly NTC SUC Temperature CN_TH4 263230E Thermistor Assembly NTC DIS Temperature CN_TH5 263230F Thermistor Assembly NTC Outdoor air Temperature CN_TH7 263230G Thermistor Assembly NTC MID PIPE Temperature CN_TH8 263230H Thermis...

Page 26: ... 349480 237202 W4986A W4986B 561410 661400 552200 152503 268711B 237200B W6200 237200A W6640A W6640B 137215 261704 W0FZZB W5210DA 165000 W5210DB W52240A W52240B Location No Description Information Etc 263230D Thermistor Assembly NTC SUC Temperature CN_TH4 263230E Thermistor Assembly NTC DIS Temperature CN_TH5 263230F Thermistor Assembly NTC Outdoor air Temperature CN_TH7 263230G Thermistor Assembl...

Page 27: ...7202 W4986A W4986B 561410 661400 152503 268711B 237200B W6200 553000 237200A W6640A W6640B 137215 261704 552117A 552117B 552200 165000 W52240A W52240B Location No Description Information Etc 263230D Thermistor Assembly NTC SUC Temperature CN_TH4 263230E Thermistor Assembly NTC DIS Temperature CN_TH5 263230F Thermistor Assembly NTC Outdoor air Temperature CN_TH7 263230G Thermistor Assembly NTC MID ...

Page 28: ...63230G Thermistor Assembly NTC MID PIPE Temperature CN_TH8 W6631A Harness Multi Compressor Leadwire W6631F Harness Single Base Pan Heater Connector 250V 1A W6631G Harness Single Sump Heater Connector 250V 1A 553000A Heater Sump Base Pan Heater 553000B Heater Sump Sump Heater W50010 Accessory Assembly Damper Drain Nipple Accessory W0FZZA Fuse Time Delay Power Supply Fuse 250V 35A W0FZZB Fuse Time D...

Page 29: ... H U W 0 9 6 A 3 Series Number 3 Series Function A General heating heat pump Series Number 3 Series Function A General heating heat pump B DHW tank integrated with Buffer tank D DHW tank integrated Electrical ratings 6 1 phase 220 240V AC 50Hz 8 3 phase 380 415V AC 50Hz Heating Capacity kW 05 5kW 07 7kW 09 9kW 12 12kW 14 14kW 16 16kW Model Type W Inverter Heat Pump Classification U Outdoor Unit Ai...

Page 30: ...utdoor ambient temperature 35 C 24 C 3 All appliances were tested at atmospheric pressure Model Name Built In Electric Heater kW Capacity Power Source Outdoor Unit Indoor Unit Heating kW 1 Cooling kW 2 AHUW146A2 AHNW16606B0 1Ø 4 2 2 3Ø 6 2 2 2 14 0 11 0 220 240 V 50 Hz AHUW096A3 9 0 9 0 AHUW126A3 12 0 10 4 AHUW146A3 14 0 11 0 AHUW166A3 16 0 12 0 AHUW128A3 12 0 10 4 380 415 V 50 Hz AHUW148A3 14 0 1...

Page 31: ...t of compressor 5 Remove the rubber caps put on the suction and discharge pipe of the new compressor to release the sealing nitrogen gas 6 Braze the suction and discharge pipe with brazing torch to the compressor 7 Conduct air tight test to check the piping system is free from leakage 8 Connect power cable to the terminal board of com pressor and cover the compressor with sound proof Figure 2 9 Co...

Page 32: ...ls after replacement make sure that screws of top panel are assembled as shown figure below If screws are not assembled it allows rain come into control box causing defect of unit 10 Caution for Assembling Outdoor Panels after Test Run ...

Page 33: ... assembly Description of error There are traces of water or moisture on the electronic components of the controller assembly Response One of the components of the controller assembly or an individual component does not work properly or sends faulty information into the PLC The most frequent indication is an error reading on the user interface MODULE xx ALARM Possible causes An incorrectly wired el...

Page 34: ...here is enough water in the system and that it flows flawlessly or that there is enough flow the flow switch indicates an error The flow switch is in the incorrect position normally opened normally closed or it is mechanically defective and has to be replaced Fourth possible error Bad water quality or dirt Check the water quality if it contains possible particles or dirt which could lead to blocka...

Page 35: ...relay panel of module 1 must be replaced b Check the user interface if there is communication between PLC MBIO12 1 MODULE 1 ALARM The reading of the error in the first line of the PLC controller inter face Hold the key to display SERVICE DISPLAY To enter the menu press the ENTER key Hold the key to display the lower part 2 MODULE 1 45 73 Bet 0 Bet 0 no problems with the connection with MD1 Bet 5 B...

Page 36: ...dequacy the relay panel of module 2 must be replaced b Check the user interface if there is communication between PLC MBIO12 1 MODULE 2 ALARM The reading of the error in the first line of the PLC controller inter face Hold the key to display SERVICE DISPLAY To enter the menu press the ENTER key Hold the key to display the lower part 2 MODULE 2 45 73 Bet 0 Bet 0 no problems with the connection with...

Page 37: ...r ERROR Thermostat Description of error Spatial corrector error Response of internal unit con troller The device automatically restarts after the error is resolved Possible causes The communication cable between the internal unit and spatial thermostat is damaged Faulty wiring of the spatial thermostat Faulty setting of the spatial thermostat on the basic controller of the internal unit Termotroni...

Page 38: ...er The temperature sensor is damaged Troubleshooting Check the connection of the temperature sensor PT1000 In case of faulty connection of the temperature sensor PT1000 it must be connected accurately Check the operation of the temperature sensor PT1000 Check the operation of the temperature sensor PT1000 resistance 1000 Ohm at 0 C see the resistance table for sensors PT1000 if a malfunction of th...

Page 39: ...riate The sensors have to be placed higher the recommended position is somewhere in the middle of the DHW Displaying the error MODULE INV ALARM Description of error Lost communication with the external device Response of internal unit controller The device automatically restarts after the error is resolved Possible causes The external or the internal unit is disconnected The communication cable be...

Page 40: ...ressure sensor disconnection or short circuit of inverter compressor 44 Outdoor air Th Error Open Short Air temperature sensor disconnection or short circuit 45 Cond Middle Pipe Th Error Open Short Condenser Middle Pipe sensor disconnection or short circuit 46 Suction Pipe Th Error Open Short Inverter compressor suction temperature sensor disconnection or short circuit 48 Cond Out Pipe Th Error Op...

Page 41: ...e the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly 1 U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is compressor Wire connection condition normal No Yes Check inverter PCB assembly 1 IPM normality Rep...

Page 42: ... 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB Inverter needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 4 0 6 V PFC_IPM check U V W R S T ...

Page 43: ...3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB Inverter needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 4 0 6 V PFC_IPM check...

Page 44: ...tance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB Inverter needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 4 0 6 V PFC_IPM check U V W R S T ...

Page 45: ...phase is 230V 15 Check connection condition and wiring if power is abnormal Yes PCB Assembly 1 normal No Check PCB Assembly 1 IPM normality Replace inverter PCB assembly Are the resistance Between each phase and insulation resistance of Inverter compressor normal No 1 Check resistance between each terminal of compressor 2 Check insulation resistance between compressor terminal and pipe Replace com...

Page 46: ...UW096A3 Check output the CT Sensor DC 2 5 0 2V AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 Check output pin 2 3 of the CT Sensor DC 2 5 0 2V AHUW128A3 AHUW148A3 AHUW168A3 Check input_current_T_PFC and R_PFC of the CT sensor DC 2 5 0 2V IN I GND CT Sensing Check Point Black Red Vdc CT Sensing Check Point Inverter PCB 1 2 3 Vdc AHUW096A3 AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 ...

Page 47: ... 47 AHUW128A3 AHUW148A3 AHUW168A3 Inverter PCB CT Sensing Check Point GND DC LINK Voltage _ INV GND Input_Current_T_PFC Input_Current_R_PFC 4kW ...

Page 48: ...Chart PCB assembly 1 Power connection normal No Yes Is input voltage normal No Yes Is PCB Inverter Normal No Replace PCB assembly 1 Recheck power and installation condition Yes Check power input voltage Check power connection state WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after chec...

Page 49: ...g diagram 2 Check the DC Link voltage at not operating 280V 3 Check the DC Link voltage at Comp operating 340V 4 Check DC Link Sensing Signal AHUW 6A2 2 4 2 8V Refer the Picture 5 Check DC Link Sensing Signal AHUW 8A2 0 4 0 6V Refer the Picture IN I GND CT Sensing Check Point Black Red Vdc AHUW096A3 ...

Page 50: ... 50 Vdc P GND AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 51: ...terminal and pipe Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is compressor Wire connection condition nor...

Page 52: ... If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 4 0 6 V PFC_IPM check U V W R S T 1 IPM Check ...

Page 53: ...et Multi tester DC voltage measurement mode 2 Mesure the below mesureing point DC voltages at Power on standby state 3 If the measurements are outside DC 2 5V 0 2V the parts are decided as burned 3 Connector Check U V W WVC connector check CT Sensing Check Point Red Black ...

Page 54: ...ity found Is installation condition normal Is compressor Wire connection condition normal 1 Check PCB assembly 1 U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is AC input Wire connection condition normal 1 Check L N connection condition 2 Check wire disconnection and wiring Rea...

Page 55: ...hort Check Point After turning off the main power R24N between the ends of the resistance will be measured 620 670Ω After turning off the between the ends o be measured 620 6 AHUW096A3 AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 ...

Page 56: ... 56 P T S R N U N V N W AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 57: ...240 V 10 Check connection condition and wiring if power is abnormal Yes Is PCB assembly 1 normal No Check PCB assembly 1 IPM normality Replace inverter PCB assembly Are the resistance between each phase and insulation resistance of Inverter compressor normal No 1 Check resistance between each terminal of compressor 0 188 7 2 Check insulation resistance between compressor terminal and pipe over 50 ...

Page 58: ...onnector displaced poor LEV assembly Check outdoor fan constraint screened flow structure Check refrigerant leakage Check if the sensor is normal Check the status of EEV assembly CN_TH3 RED 4Pin Connector WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode o...

Page 59: ...ormal Yes No Adjust the amount of refrigerant Additive charge check communication piping correction Is strainer Ok No Replace the strainer No Replace the pressure sensor Yes Yes Check unit LEV Check unit PCB Inverter Check unit installation conditions Yes Is there pipe crack or trace of refrigerant leakage Weld reconnect the cracked portion and recharge refrigerant No Yes If the temperature differ...

Page 60: ...mistor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Inverter 48 Condenser Out pipe sen sor Open Short Soldered poorly Internal circuit error 1 Bad connection of thermistor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Inverter Check Point 1 Estimate the resistance of each sensor Unplugged 2 Check the value of the resistor of thermist...

Page 61: ...re connector Open Short Defect of connector PCB Inverter Open Short Defect of PCB Inverter Is sensor connected to PCB Inverter correctly Connect sensor to PCB correctly Replace corresponding pressure sensor Yes No Replace the pressure sensor Yes No No Yes END After replacement of outdoor unit main PCB Inverter is the system also abnormal Is pressure sensor OK Check the value of pressure sensor Cf ...

Page 62: ...f wire coating Check the Heat sink and Chassis Panel Checking power source LED Off Damage of wire coating Replacement of inverter PCB Replacement of main PCB It should not be short Refer to 3 15 1 WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking the measurement mode of the me...

Page 63: ...r checking Checking method of afulty points ڸ Insufﬁcient insertion of wires ڹ Damage of wire coating Interference with wires or wire coating damage with chopping ں Inverter PCB LED Replacement of inverter PCB during LED Off after resetting OK NG AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 64: ...cation wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly connected 5 Make sure you have connected to the communication line soldering If you do not connect by soldering a communication error CH05 CH53 occurs by noise WARNING Befor...

Page 65: ...everse rotation of con stant rate compressor Main power wiring fault n Error diagnosis and countermeasure flow chart Items for checking Sub items for checking Installation Checking N phase Checking for open and reverse phase Fuse damage R and S phases AC load Inverter PCB Checking for power phase loss Refer to 3 17 1 Refer to 3 17 2 Refer to 3 17 3 ...

Page 66: ...es not generate voltage was upgraded Power module requires checking n Judgment method of open and reverse phase of R S T Operation with replacement of R and S phases only Brown B Black Green Brown B Black Green R S T N R S T N Brown B Black Green Brown B Black Green S R S T N R S T N R S T N Vac Vac Vac AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 67: ...installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is PCB assembly 1 normal No Yes Replace PCB assembly 1 Yes MAIN PCB assembly 1 normal No Replace MAIN PCB assembly 1 WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power su...

Page 68: ... 68 EEPROM EEPROM AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 69: ...utdoor fan constraint screened flow structure Check if refrigerant overcharged Check the status of EEV assembly Check the status of sensor assembly burn CN C PIPE Violet 3Pin Connector Recheck power and installation condition WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power supply after checking t...

Page 70: ... Check the outdoor fan is driving rightly Display code Title Cause of error Check point Normal condition n Error Diagnosis and Countermeasure Flow Chart Is it good Screw Torque of IPM PFCM No Yes Be tighten the screw of IPM PFCM Change the Inverter PCB Is it normal Resistor between 22 and 23 Pin of IPM PFCM Is it normal thermal grease of IPM PFCM Is it normal IPM PFCM Recheck Power and installatio...

Page 71: ... 71 Heatsink Temp output Pin IPM PFCM 1 2 1 2 Ω PFCM Measuring resistance between No 19 20 pin AHUW096A3 AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 72: ...r normal No Yes 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor 1Ţ0 2V 3 Replace PCB Inverter if abnormality found Is wire connection of ODU Fan Motor wire normal No Yes Check wiring between OUD fan motor and PCB Inverter Check if Hall Senor and Motor output terminal color is matched Reassemble if abnormality found Is PCB assembly 1 normal No Yes Replace PCB...

Page 73: ... 73 Main PCB Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor AHUW096A3 AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 74: ...nnector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 1 Check PCB assembly 1 U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is AC input Wi...

Page 75: ... 75 Main PCB wiring Check Point N N L N L Noise Filter wiring Check Point L N Input Power Source Check Point AHUW096A3 ...

Page 76: ... 76 L N N L L L N N N L N L L N AHUW146A2 AHUW126A3 AHUW146A3 AHUW166A3 ...

Page 77: ... 77 L N L N R S T N L N L N AHUW128A3 AHUW148A3 AHUW168A3 ...

Page 78: ...31 80 0 63 0 459 85 0 54 0 397 90 0 46 0 345 95 0 4 0 3 100 0 34 0 262 Pipe Temp B Constant 3977 Std Temp 25 Resistance 10 Temp Resistance Volt 30 204 35 4 72 25 146 97 4 62 20 107 09 4 492 15 79 4 336 10 58 95 4 149 5 44 47 3 931 0 33 9 3 685 5 26 09 3 416 10 20 27 3 131 15 15 89 2 838 20 12 55 2 546 25 10 2 262 30 8 03 1 994 35 6 49 1 745 40 5 28 1 519 45 4 32 1 316 50 3 56 1 137 55 2 95 0 981 6...

Page 79: ...0 1 26 2 28 85 1 07 2 09 90 0 92 1 9 95 0 8 1 73 100 0 69 1 57 Heatsink Temp B Constant 3500 Std Temp 25 Resistance 200 Temp Resistance Volt 30 2845 99 4 969 0 585 66 4 851 5 465 17 4 814 10 372 49 4 77 15 300 58 4 717 20 244 33 4 657 25 200 4 587 30 164 79 4 508 35 136 64 4 418 40 113 98 4 318 45 95 62 4 208 50 80 65 4 088 55 68 38 3 958 60 58 27 3 82 65 49 88 3 674 70 42 9 3 522 75 37 05 3 365 8...

Page 80: ...essor resistance standards 5 I f any disorder is found measure the line resistance between the terminals of the comperssor as shown below 6 If the compressor is found to be normal any compr essor connection wire may have a fault Terminal Insulation Resistance U panel 10MΩ V panel 10MΩ W panel 10MΩ Compressor terminals n How to check the U V and W phase resistance Measure the line resistance betwee...

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Summary of Contents for THERMA V AHNW16606B0

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LG THERMA V AHNW16606B0, Service Manual, Page: 60 / 81

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Summary of Contents for THERMA V AHNW16606B0

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