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LG A2UW18GFA0 Svc Manual
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LG A2UW18GFA0 Svc Manual

Multi air conditioner
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Internal Use Only
http://biz.lgservice.com
Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.

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Summary of Contents for LG A2UW18GFA0

  • Page 1 Internal Use Only http://biz.lgservice.com Multi Air Conditioner SVC MANUAL(General) MODEL : Multi-Inverter Type CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

  • Page 2: Table Of Contents

    4. Gas Charging ......................43 5. Cycle Part ......................44 6. Electronic Parts....................45 Part 6 Service Order.........................110 1. PCB Service Order ....................111 - 1 - Copyright ©2014 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 1. Safety Precautions ......................3 2. Model Line Up ........................6 3. Nomenclature........................9 - 2 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 4: Safety Precautions

    Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock. - 3 - Copyright ©2014 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. - 4 - Copyright ©2014 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. - 5 - Copyright ©2014 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) - 6 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 No. of connectable indoor units (Min. ~ Max.) 2 ~ 8 Total capacity index of connectable indoor units Power supply 208/230V, 1Ø, 60Hz Chassis - 7 - Copyright ©2012 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) - 8 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Nomenclature

    Indicates that this is multi system outdoor unit using R410A Ex) A4U : Connectable max. 4 indoor units A9U : Connectable max. 9 indoor units - 9 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 “36” mean that 5k~24k Indoor unit connected to BD unit BD : Branch distributor M : Multi system outdoor unit P : Parts - 10 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 12: Part 2 Functions & Controls

    7. Special Function & KIT ....................26 7.1 Low Ambient control....................26 7.2 Space Control ......................26 7.3 Auto Elevation Grille....................26 7.4 Defrost Control(Heating) .....................28 - 11 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: List Of Functions & Accessory

    Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, sup- plied with separate package. - 12 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 PQNFB17B0 Y branch Accessory Installation Header branch Accessory Air Guide ODU Dry Contact Low Ambient Kit O (Logical operation) - 13 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 14 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: 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) - 15 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: 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 - 16 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 18: 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. - 17 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 19: Reliability

    Compressor OFF Temp. ➔ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 18 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: Convenience Functions & Controls

    Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 19 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Auto Cleaning Operation

    • While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature. - 20 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 22: 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. - 21 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: 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. - 22 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: 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. - 23 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: 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 - 24 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Two Thermistor Control

    Operation of lower temperature by comparing indoor unit's and wired remote Heating controller's temperature. ❈ The function of 2TH has different operation characteristics according to the product. - 25 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: 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. - 26 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 28 • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 27 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Defrost Control(Heating)

    • The second defrost starts only when the outdoor pipe temperature falls below – 6°C after from ending of the first defrost and more than 10 minutes operation of compressor. - 28 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Part 3 Basic Control

    6.1 High pressure protection control ................32 6.2 Low pressure protection control ................32 6.3 Discharge temperature control ................32 6.4 Input Current control ...................32 - 29 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 31: Normal Operation

    EEV operates with PI control rules to keep the degree of superheat at the evaporator inlet and outlet status. - 30 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Oil Return Control

    Setting value Min. Pulse 4 way valve Indoor unit Component Starting Running Ending Normal control Normal control Oil return signal - 31 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Protection Control

    14A or less Over than 14A ❈ Remarks: The data of pressure and frequency are different model by model. - 32 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Part 4 Test Run

    Part 4. Test Run 1. Check before Test Run.....................34 2. Test Run Flow chart ......................35 3. Test Running ........................36 - 33 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 35: 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. - 34 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Test Run Flow Chart

    Guide Normal • Each indoor unit should be tested. • If the unit has accessory, it should be tested. - 35 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Test Runing

    ■ In the case when the vibration of the unit is conveyed to the hose, secure the unit with an anti-vibration rubber. Discharge temperature - 36 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 ❏ Aren't terminal screws loosened? (refrigerant and drain piping)? ❏ 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} - 37 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: Part 5 Trouble Shooting Guide

    6.4 When indoor Fan does not operate................48 6.5 When the louver does not operate................49 6.6 Troubleshooting Indoor Error ..................50 6.7 Troubleshooting Outdoor Error ...................56 - 38 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: 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 - 39 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Error Indicator (Outdoor)

    7times ◑ 3times ◑ Over Current of Outdoor Unit PFC PFC Fault Error(S/W) ◑ : A light on the display panel is blink. - 40 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Pump Down

    4. Pump Down can be stopped (The compressor is turned off), because of compressor protection. In this case, reset the power. - 41 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Evacuation

    Oxygen and do not use Flammable gases. pump). Otherwise, it may cause fire or explosion. - Otherwise, it may cause personal injury. - 42 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Gas Charging

    - Any presence of foreign substance such as air repeat the procedure (pumping down-pin). can cause an abnormal pressure rise and may result in explosion or injury. - 43 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 44 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC4.5V↑ - 45 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: The Product Doesn't Operate With The Remote Controller

    * Check display PCB Assembly - Voltage between CN-DISP1 should be DC +5V, - If problem still persists, Replace display PCB - 46 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: The Compressor/Outdoor Fan Are Don't Operate

    Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 47 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: 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 - 48 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 50: 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 - 49 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: Troubleshooting Indoor Error

    8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. → Repair or Change the PCB. - 50 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 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 - 51 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) → Repair or Change the main PCB. - 52 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 Press the on/off button or mode change button and matching the indoor unit mode same as the first operated indoor unit - 53 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 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 - 54 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 → Check Red line to Black line, Blue line to Black line → The resistance should infinite → replace the motor - 55 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 57: Troubleshooting Outdoor Error

    • Check outdoor fan constraint / screened / flow (Outdoor fan constraint, structure screened, blocked) • Check if IPM burned • Burned parts inside PCB - 56 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 1MΩ ↑ U - chassis 1MΩ ↑ V - chassis 1MΩ ↑ W - chassis [IPM Position & Pin number] - 57 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 5V_GND 5V_GND 5V_GND DC_LINK - 58 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 5V_GND 5V_GND 5V_GND DC_LINK Recheck power and installation condition - 59 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 → wiring again if abnormality found Replace main PCB assembly. Monitoring PCB LED display error Recheck power and installation condition - 60 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 5V_GND 5V_GND 5V_GND DC_LINK Recheck power and installation condition - 61 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 → 100Ω ↑ • Remedy : replace PCB Assembly. Recheck power and installation condition - 62 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 64 5V_GND 5V_GND 5V_GND Comp_Current Recheck power and installation condition - 63 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 CN- DISCHARGE (BLACK 3Pin Connector) Replace the Thermistor - 64 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 65 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 • Remedy : remove cause of error Recheck power and installation condition 5V_GND 5V_GND 5V_GND 5V_GND 5V_GND 5V_GND Comp_Current Input_I - 66 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 • Remedy : remove cause of error Recheck power and installation condition Main PCB Connector PCB Suction pipe connector D-pipe sensor connector - 67 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 PCB correctly? After replacement of outdoor unit main PCB is the system also abnormal? Replace corresponding pressure sensor - 68 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Max.single indoor unit capacity A2UW18GFA0 A3UW24GFA0 Check Point • CH 51 1. Check the indoor unit capacity. 2. Check the combination table. - 69 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 Recheck power and installation condition - 70 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 1. Check the consistency of the EEPROM s direction inserted in the PCB and the EEPROM marking. <EEPROM Direction Check Point> - 71 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 CN- C/PIPE (Violet 3Pin Connector) Replace the Thermistor - 72 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 ? • Replace main PCBA it abnormality found Recheck installation condition and connection of Heat sink - 73 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 ? • Replace main PCBA it abnormality found Recheck installation condition and connection of Heat sink - 74 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode) 2. Voltage value should be in 1V ±0.2V. - 75 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 Comp pipe Resistance(Ω) at 20°C Constant Inverter Terminal comp. comp. U-GND 2MΩ 2MΩ V-GND 2MΩ 2MΩ W-GND 2MΩ 2MΩ - 76 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 23 22 21 0.4 ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM check U, V, W R S T - 77 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 23 22 21 0.4 ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM check U, V, W R S T - 78 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 79 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 (54k - Check output pin 1.2 of the CT Sensor : 5V ) IN/I Black <CT Sensing Check Point> < Inverter PCB> <CT Sensing Check Point> - 80 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 Power connection normal? Inverter PCB assembly CN(L), CN(N) Replace inverter PCB assembly Is Inverter PCB Normal? Recheck power and installation condition - 81 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 3. Check the DC Link voltage at Comp operating(340V↑) 4. Check DC Link Sensing Signal :2.4~2.8V (Refer the Picture) ■ 36k IN/I Black <CT Sensing Check Point> - 82 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 Part 5. Trouble Shooting < Inverter PCB> <DC Link Voltage Check Point> <Connection Check Point> DC_LINK DC_LINK DC_LINK <DC_LINK Sensing Check Point> - 83 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 1. Check the Input Voltage (L–N ➔ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 84 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 IN/I Black <CT Sensing Check Point> INPUT(V) INPUT(V) INPUT(V) < Input Voltage Sensing Check Point > < Inverter PCB> - 85 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition U, V, W <CT Sensing Check Point> - 86 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 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> - 87 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 88 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 CN_TH3 (RED 4Pin Connector) - 89 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 90 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 91 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 1. Check the Input Voltage (L–N ➔ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 92 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 Part 5. Trouble Shooting IN/I Black <CT Sensing Check Point> INPUT(CT) INPUT(CT) INPUT(CT) < CT Sensing Check Point > < Inverter PCB> - 93 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 : Normal Value of the resistor is 5kΩ at 25℃ Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃ - 94 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 PCB correctly? After replacement of outdoor unit main PCB is the system also abnormal? Replace corresponding pressure sensor - 95 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 Max.single indoor unit capacity A4UW36GFA0 A8UW54GFA0 Check Point • CH 51 1. Check the indoor unit capacity. 2. Check the combination table. - 96 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 1. In Case of CH53, Check the Connection → L,N at the terminal block CN-COMM CN-Power < MAIN PCB > < TERMINAL BLOCK > L1 L2 - 97 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 MAIN PCB assembly normal? Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction - 98 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 Part 5. Trouble Shooting <MAIN PCB> <Inverter PCB> <EEPROM Direction Check Point> - 99 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 101 CN- C/PIPE (Violet 3Pin Connector) Recheck power and installation condition - 100 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 102 2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k 3. Resistance value should be in 7kΩ ±10%.(at 25°C). - 101 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 103 Measuring resistance between No.19,20 pin PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 102 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 104 3. Resistance value should be in 7kΩ ±10%.(at 25°C). 4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition. - 103 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 105 A: PSCM /PFCM B: SPM PFCM : IPM : Measuring resistance Measuring resistance between No.19,20 pin between No.24,25 pin - 104 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 106 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. - 105 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 107 Part 5. Trouble Shooting Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> <Inverter PCB> - 106 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 108 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 107 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 109 < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 108 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 110 < Input Power Source Check Point > < Inverter PCB wiring Check Point > < Inverter PCB wiring Check Point > - 109 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 111: Part 6 Service Order

    Part 6. Service Order Part 6. Service Order 1. PCB Service Order ......................111 - 110 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 112: Pcb Service Order

    Tighten PCB Screws (6ea) Raise PCB and Re-wire terminal Assemble C/Box and Top Cover take terminals from PCB into a complete whole - 111 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 113 January, 2014 P/NO : MFL68280201...

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