LG AMNW07GDBB0 Service Manual
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LG AMNW07GDBB0 Service Manual

LG AMNW07GDBB0 Service Manual

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SERVICE MANUAL
AIR
CONDITIONER
Please read this manual carefully before operating
your set and retain it for future reference.
General
Multi-Inverter Type
P/NO : MFL68280204

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Summary of Contents for LG AMNW07GDBB0

  • Page 1 SERVICE MANUAL CONDITIONER Please read this manual carefully before operating your set and retain it for future reference. General Multi-Inverter Type P/NO : MFL68280204...

  • Page 2: Table Of Contents

    1. Self-diagnosis Function ..................42 2. Pump Down ......................44 3. Evacuation......................45 4. Gas Charging ......................46 5. Cycle Part ......................47 6. Electronic Parts....................48 - 2 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Part 1 General Information

    Part 1 General Information Part 1 General Information 1. Safety Precautions ......................4 2. Model Line Up ........................7 3. Nomenclature........................10 - 3 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Safety Precautions

    Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks. - 4 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. - 5 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 6 Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor. - 6 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    * Indicates color of panel – ART COOL : Gold(G), White Silver(H), Blue(B), Gallery(1) ART COOL Mirror : Mirror(R), Silver(V), White(W) - 7 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 2 ~ 5 2 ~ 6 Total capacity index of connectable indoor units Power supply 208/230V, 1Ø, 60Hz Chassis - 8 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 To BD unit Ø9.52 (3/8) To ODU To ODU Ø9.52 (3/8) Ø19.05 (3/4) PMBL5620 MULTI Branch Ø19.05 (3/4) Ø9.52 (3/8) - 9 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Nomenclature

    '18' Model type W : DC Inverter heat pump Indicates that this is multi system indoor unit using R410A - 10 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 Eco eye+Plasma+Allergy Filter+4way Plasma+Allergy Filter+4way Allergy Filter+4way Allergy Filter+2way Basic+Low Ambient Basic+(A/clean)+4way+Low A Serial No. LG Model Development Serial No. - 11 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units A6U : Connectable max. 6 indoor units - 12 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 “36” mean that 7~36kBtu/h Class Indoor unit connected to BD unit BD : Branch distributor M : Multi system outdoor unit P : Parts - 13 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 14: Part 2 Functions & Controls

    7. Special Function & KIT ....................29 7.1 Low Ambient control....................29 7.2 Space Control ......................29 7.3 Auto Elevation Grille....................29 7.4 Defrost Control(Heating) .....................31 - 14 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: List Of Functions & Accessory

    Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, sup- plied with separate package. - 15 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 16 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 16 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 17 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: Air Flow Step

    After one minute, it is opposite. Vane 1 Vane 3 Vane 4 • Comparison of Air Flow Types 4-Open (conventional) Swirl Swing (New) - 18 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Air Purifying

    Dust electrode discharge Dust particles Photo-Catalyst Coated Mesh Ionizer +4.8KV discharge Polluted Air Purified fresh Air Generating plasma Odour Odour molecule - 19 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Installation Functions

    E.S.P value of previous air flow rate will be maintained by remembering the E.S.P value prior to the shift. - 20 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Reliability

    Compressor OFF Temp. ‘ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 21 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: Convenience Functions & Controls

    Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 22 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: Auto Cleaning Operation

    • While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature. - 23 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Auto Restart Opeartion

    Memorized condition are on / off condition, operating mode (cooling/ heating), set temperature and fan speed. The unit will memorize the above conditions and start with same memorized condition. - 24 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Child Lock Function

    - The operation will be started if the ON/OFF button is pressed. - If you want to stop operation, re-press the button. - 25 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Group Control

    • When controlling in groups, set the master/slaver of the remote controller. Refer to Installer setting section on how to set mas- ter/slave for more detail. - 26 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Sleep Timer Operation

    Operation Time Table (Example) Setting Temp. 25°C 25°C 25°C 25°C 25°C 09:00 08:00 09:00 08:00 09:00 12:00 17:00 12:00 12:00 12:00 - 27 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Two Thermistor Control

    Operation of lower temperature by comparing indoor unit's and wired remote Heating controller's temperature. h The function of 2TH has different operation characteristics according to the product. - 28 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Special Function & Kit

    3.1 m. So it enables to install the Indoor unit at high ceiling space. And Auto Elevation Grille makes you cleaning the filter easily. - 29 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 30 • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 30 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Defrost Control(Heating)

    • The second defrost starts only when the outdoor pipe temperature falls below – 6°C after from ending of the first de- frost and more than 10 minutes operation of compressor. - 31 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Part 3 Basic Control

    6.1 High pressure protection control ................35 6.2 Low pressure protection control ................35 6.3 Discharge temperature control ................35 6.4 Input Current control ...................35 - 32 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Normal Operation

    The degree of superheat = Tsuction – Tevaporation Tsuction : temperature at suction pipe sensor(℃) Tevaporation : evaporation temperature (℃) - 33 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Oil Return Control

    Setting value Min. Pulse 4 way valve Indoor unit Component Starting Running Ending Normal control Normal control Oil return signal - 34 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: Protection Control

    14A or less Over than 14A h Remarks: The data of pressure and frequency are different model by model. - 35 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Part 4 Test Run

    Part 4. Test Run Part 4. Test Run 1. Check before Test Run.....................37 2. Test Run Flow chart ......................38 3. Test Running........................39 - 36 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Check Before Test Run

    2.0 MΩ as a result of refrigerant accumulation in the internal compressor. If the insulation resistance is less than 2.0 MΩ, turn on the main power supply. - 37 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Test Run Flow Chart

    After Hot Start Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 38 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Test Runing

    In the case when the vibration of the unit is conveyed to Discharge the hose, secure the unit with an anti-vibration rubber. temperature - 39 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 40 Aren't terminal screws loosened? (refrigerant and drain piping)? o Is there any leakage of refrigerant? M4..118N.cm{12kgf.cm} M5..196N.cm{20kgf.cm} M6..245N.cm{25kgf.cm} M8..588N.cm{60kgf.cm} - 40 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Part 5 Trouble Shooting Guide

    6.4 When indoor Fan does not operate................51 6.5 When the louver does not operate................52 6.6 Troubleshooting Indoor Error ..................53 6.7 Troubleshooting Outdoor Error..................59 - 41 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Self-Diagnosis Function

    Communcation error between in and out Indoor Out-Piping sensor error Differnt mode operation EEPROM Check Sum Error Indoor BLDC Fan Lock - 42 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Error Indicator (Outdoor)

    7times ◑ 3times ◑ Over Current of Outdoor Unit PFC PFC Fault Error(S/W) ◑ : A light on the display panel is blink. - 43 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Pump Down

    4. Pump Down can be stopped (The compressor is turned off), because of compressor protection. In this case, reset the power. - 44 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Evacuation

    Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explosion. - Otherwise, it may cause personal injury. - 45 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Gas Charging

    - Any presence of foreign substance such as air can peat the procedure (pumping down-pin). cause an abnormal pressure rise and may result in explosion or injury. - 46 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 47 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC4.5V↑ - 48 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: The Product Doesn't Operate With The Remote Controller

    Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange (EVA.) - 49 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 50 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: When Indoor Fan Does Not Operate

    The voltage of Pin No 1(orange) and 3(black) of CN-FAN. About AC 160V over About AC 50V over SSR is not damaged Check SSR - 51 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 52: When The Louver Does Not Operate

    If there are no problems after above checks. • Confirm the assembly condition that are catching and interfering parts in the link of the vertical louver - 52 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Troubleshooting Indoor Error

    8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ’ Repair or Change the PCB. - 53 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 3. Check the volt. Of main PCB power source. (DC 12V) ’ Repair or Change the main PCB. 4. Check the installation of wired remote controller. (Noise interference) ’ Adjust the state of installation - 54 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) ’ Repair or Change the main PCB. - 55 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 Press the on/off button or mode change button and matching the indoor unit mode same as the first operated indoor unit - 56 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 2. If the EEPROM value & the Program value are not matched, the Code is Displayed 3. After Checking the connection and Insertion, replace the PCB or Option PCB - 57 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 ’ Check Red line to Black line, Blue line to Black line ’ The resistance should infinite ’ replace the motor - 58 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: Troubleshooting Outdoor Error

    Comp pipe Resistance(Ω) at 20°C Constant Inverter Terminal comp. comp. U-GND 2MΩ 2MΩ V-GND 2MΩ 2MΩ W-GND 2MΩ 2MΩ - 59 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 23 22 21 0.4 ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM check U, V, W ‘ R S T - 60 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 U, V, W 0.3 ~ 0.5 V Sequence of Normal Measurement 11-12 Measurement Standards Black 13-15 0.3V~0.5V 0.3V~0.5V 0.3V~0.5V 25-26 - 61 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 62 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 (36/42 kBtu/h class - Check output pin 1.2 of the CT Sensor : 5V ) ▶18,24,30kBtu/h class I_IN I_IN 2.5V Black ▶36,42kBtu/h class < Inverter PCB> <CT Sensing Check Point> - 63 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 Power connection normal? Inverter PCB assembly CN(L), CN(N) Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 64 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 0.3V~0.5V A – C 0.3V~0.5V C : Collector / E : Emitter A : Anode / C : Cathode - 65 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 Part 5. Trouble Shooting ▶36,42kBtu/h class * Measuring input voltage <Inverter PCB> - 66 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 1. Check the Input Voltage (L1~L2 ‘ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 67 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 <CT Sensing Check Point> 36,42kBtu/h class INPUT(V) INPUT(V) INPUT(V) INPUT(V) < Inverter PCB> < Input Voltage Sensing Check Point > - 68 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition 18,24,30kBtu/h class INV_Cur INV_Current INV_Current 2.5V Black - 69 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Part 5. Trouble Shooting 36,42kBtu/h class * Measuring resistance between each terminal of compressor * Compressor wire connection - 70 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 ③ Replace PCB assembly if it is short between pins except No.4,5 pins. CAUTION PFCM module No.4,5 pins are internal short state. <Short Check Point> - 71 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 72 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 CN- DISCHARGE (BLACK 3Pin Connector) CN_TH3 (RED 4Pin Connector) Replace the Thermistor - 73 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 74 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 75 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 1. Check the Input Voltage (L1~L2 ‘ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 76 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 INV_Current INV_Current 2.5V Black <CT Sensing Check Point> 36,42kBtu/h class < Inverter PCB> < CT Sensing Check Point > - 77 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 : Normal Value of the resistor is 5kΩ at 25℃ Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃ - 78 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 PCB correctly? After replacement of outdoor unit main PCB is the system also abnormal? Replace corresponding pressure sensor - 79 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Max.single indoor unit capacity A2UW18GFH0 A3UW24GFH0 A4UW30GFH0 A5UW36GFH0 A6UW42GFH0 Check Point 1. Check the indoor unit capacity. 2. Check the combination table. - 80 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 1. In Case of CH53, Check the Connection ’ L1,L2 at the terminal block CN-COMM CN-Power < MAIN PCB > L1 L2 < TERMINAL BLOCK > - 81 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 MAIN PCB assembly normal? Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction 18,24,30kBtu/h class EEPROM - 82 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 Part 5. Trouble Shooting 36,42kBtu/h class - 83 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 CN- C/PIPE (Violet 3Pin Connector) Replace the Thermistor - 84 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 2. Resistance value should be in 7kΩ ±10%.(at 25°C). 3. Check Inv. PCB Screw Connection Condition – only 36,42kBtu/h class - 85 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 Part 5. Trouble Shooting 18,24,30kBtu/h class 9~11KΩ PFCM : Measuring resistance Black between No.19,20 pin 36,42kBtu/h class Check Screw Connection Condition - 86 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module 2. Resistance value should be in 7kΩ ±10%.(at 25°C). 3. Check the PFC Module No.19, 20. - 87 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 3. Do not replacing all of fan motor and PCB at once. Check error code again, after replacing the abnormal part (Fan Motor or PCB) first. - 88 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 1pin and 4pin of fan motor possible short Fan motor connector Tester Tester 36,42kBtu/h class <Inverter PCB> - 89 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 90 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 91 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 < Noise Filter wiring Check Point > < Input Power Source Check Point > < Inverter PCB wiring Check Point > - 92 - Copyright ©2017 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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