LG AUUQ18GH1 Svc Manual
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LG AUUQ18GH1 Svc Manual

LG AUUQ18GH1 Svc Manual

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See also: Owner's Manual
Internal Use Only
http://biz.lgservice.com
Air Conditioner
SVC MANUAL(General)
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 AUUQ18GH1

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

  • Page 2: Table Of Contents

    3. Evacuation (All amount of refrigerant leaked) ............42 4. Gas Charging (After Evacuation)................43 5. Cycle Part........................44 6. Electronic Parts......................45 - 2 - Copyright ©2013 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 ......................4 2. Model Line Up ........................7 3. Nomenclature........................10 - 3 - Copyright ©2013 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. - 4 - Copyright ©2013 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 ©2013 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    AVNQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABNQ18GHLA0 ABNQ21GHLA0 High static ABNQ24GGLA0 ABNQ36GGLA0 pressure Ceiling concealed ABNQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 duct ABNQ18GL2A0 ABNQ21GL2A0 static pressure ABNQ24GL3A0 - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 Connectable indoor unit model names AVNQ36GKLA0 AVNQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABNQ36GGLA0 ABNQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 220-240V, 1Ø, 50Hz Power supply 220V, 1Ø, 60Hz Chassis - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 9: Nomenclature

    G : 220-240V, 1Ø, 50Hz / 220V, 1Ø, 60Hz Capacity code Model Type Q : Cooling Only R410A Single A Outdoor Unit - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Part 2 Functions & Controls

    6.9 Two Thermistor Control....................32 7. Special Function & KIT ....................33 7.1 Low Ambient control....................33 7.2 Space Control ......................33 7.3 Auto Elevation Grille....................33 - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: List Of Functions & Accessory

    PI 485(for Indoor Unit) Zone controller Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 Others Telecom shelter controller - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 Zone controller ABZCA Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 Others Telecom shelter controller - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 PI 485(for Indoor Unit) Zone controller Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 Others Telecom shelter controller - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 Y branch Installation Header branch Air Guide ODU Dry Contact Low Ambient Kit O (Logical operation) O (Logical operation) - 14 - Copyright ©2013 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. - 15 - Copyright ©2013 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) - 16 - Copyright ©2013 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 - 17 - Copyright ©2013 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. - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 & E.S.P. which are mentioned in the table. 2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies. - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 38.9 49.8 44.7 42.2 50.5 48.1 ※ ABNQ42GRLA0 / ABNQ48GRLA0 As far as possible do not set ESP 82,83 - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 16.19 22.75 20.86 18.44 Note : 1. The above table shows the correlation between the air rates and E.S.P. - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 & E.S.P. which are mentioned in the table. 2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies. - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 23: High Ceiling Operation

    • Ceiling height of ʻVery highʼ function may not exist depending on the indoor unit. • Refer to the product manual for more details. - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 24: Reliability

    -0.5°C 18°C ≤ intake air temp. < 22°C intake air temp. intake air temp. < 18°C 18°C - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 25: Convenience Functions & Controls

    - intake air temperature reaches below 1.0°C of the temperature of setting temp.. • Compressors three minutes time delay. - After compressor off, the compressor can restart minimum 3 minutes later. - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Auto Cleaning Operation

    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. - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Child Lock Function

    As for the releasing method, when pressing the Button and button for approx. 3 SPEED seconds, the ‘CL’ function can be released. - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: 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. - 28 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Sleep Timer Operation

    • The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached. • If the appliance is on pause at the time set by the timer, the pause continues. - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Weekly Program

    Please move to 'minute' setup part of turning on by using button. If 'minute' indication blinks, please setup 'minute' by using button - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 (Temperature selection range : 18℃~30℃) - When desired temperature is not set, it is turned on automatically with desired temperature of previous operation. - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 32: Two Thermistor Control

    (There are products that operate at a lower temperature.) h The function of 2TH has different operation characteristics according to the product. - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: 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. - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 Automatic stop distance 1.5±0.5m 2.5±0.5m 3.5±0.5m S If you want to change automatic distance setting, consult with your sale agency. - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 36: Part 3 Basic Control

    Part 3 Basic Control 3. Basic Control 1. Normal operation......................37 2 Compressor control ......................37 3. EEV( Electronic Expansion Valve) control ..............37 - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Normal Operation

    The degree of superheat = Tsuction – Tevaporator Tsuction : temperature at suction pipe sensor(℃) Tevaporator : evaporation temperature (℃) - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: Part 4 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 39: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: Error Indicator (Outdoor)

    If abnormal voltage is supplied, the protection circuits will turn off the product in order to prevent the component damage. The product will automatically restart after 3 minutes. - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Pump Down

    Pump Down Complete Gas Valve Closed (Red LED Off, Green LED On) Power off (Red LED Off, Green LED On) - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Evacuation (All Amount Of Refrigerant Leaked)

    Oxygen and do not use Flammable gases. pump). Otherwise, it may cause fire or explosion. - Otherwise, it may cause personal injury. - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: Gas Charging (After Evacuation)

    - 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC4.5V↑ - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 46: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 48: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 50: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 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 - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 ’ Check Red line to Black line, Blue line to Black line ’ The resistance should infinite ’ replace the motor - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 GND. (Normal : Over 2M) Is it normal ? Correct connection Is connector for communication correctly connected? - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 2MΩ U-GND 2MΩ AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) V-GND 2MΩ (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) 2MΩ W-GND - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) [IPM Position & Pin number] - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 23 22 21 0.4 ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM check U, V, W ‘ R S T - 59 - Copyright ©2013 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 61 Check inverter PCB assembly IPM normality Is inverter PCB assembly → Replace inverter PCB assembly normal? Recheck power and installation condition - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) Input_I Input_I Input_I 5V_GND 5V_GND 5V_GND - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) < Inverter PCB> <CT Sensing Check Point> - 63 - Copyright ©2013 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 ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) DC_LINK DC_LINK DC_LINK 5V_GND 5V_GND 5V_GND - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 Part 4 Trouble Shooting * AUUQ36GH1 / ATNQ36GMLE3 ABNQ36GGLA0 / AVNQ36GKLA0 DC_LINK DC_LINK DC_LINK Black - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 Part 4 Trouble Shooting *AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 1. Check the Input Voltage (L–N ‘ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 Recheck power and installation condition - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Comp_Current 5V_GND 5V_GND 5V_GND * AUUQ36GH1 / ATNQ36GMLE3 ABNQ36GGLA0 / AVNQ36GKLA0 COMP_U COMP_U COMP_U Black <CT Sensing Check Point> - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 Part 4 Trouble Shooting * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 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. - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 Part 4 Trouble Shooting * AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) IGBT - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 <Short Check Point> * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) <Short Check Point> - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Recheck power and installation condition - 75 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 CN_TH3 (RED 4Pin Connector) - 76 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 (Notice: it is not full ice forming of strainer, in case that there is installation conditions not at inlet portion but at outlet portion) - 77 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 Upgrade Micom Program S/W Program normal? Replace inverter PCB assembly Is Inverter PCB assembly normal? Recheck power and installation condition - 78 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 1. Check the Input Voltage (L–N ‘ 230V±10%) 2. Check Input Voltage Sensor output voltage (2.5Vdc±10%) < Input Power Source Check Point > - 79 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) Comp_Current Comp_Current Comp_Current 5V_GND 5V_GND 5V_GND - 80 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) < Inverter PCB> <CT Sensing Check Point> - 81 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 : Normal Value of the resistor is 5kΩ at 25℃ Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃ - 82 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 Check point & Normal condition code • Check the indoor unit capacity. Over capacity • Over capacity Combination • Check the combination table. - 83 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 6. If all indoor unit is displayed CH05 but outdoor PCB not display CH53 : Check the CN_COM and CN_POWER is correctly connected. - 84 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 - Check the EEPROM Check sum & Direction * AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) EEPROM - 85 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 * AUUQ36GH1 / ATNQ36GMLE3 ABNQ36GGLA0 / AVNQ36GKLA0 EEPROM * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) EEPROM - 86 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 CN- C/PIPE (Violet 3Pin Connector) Recheck power and installation condition - 87 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 50kΩ ±10% (25°C) of PCB PFC module AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) - 88 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 Part 4 Trouble Shooting * AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) - 89 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Measuring resistance between No.19,20 pin * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) Ω - 90 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 50kΩ ±10% (25°C) of PCB PFC module AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) - 91 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 Part 4 Trouble Shooting * AUUQ18GH1 /AUUQ21GH1/ AUUQ24GH1 (ATUQ18GPLE3/ ATUQ21GPLE3/ ATUQ24GNLE3) (AVUQ18GJLA0/ AVUQ21GJLA0 / AVUQ24GJLA0) (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) - 92 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 Measuring resistance between No.19,20 pin * AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) Ω - 93 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 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. - 94 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 (ABUQ18GHLA0/ ABUQ21GHLA0/ ABUQ24GGLA0) (ABUQ18GL2A0/ ABUQ21GL2A0/ ABUQ24GL3A0) Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester - 95 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 1pin and 4pin of fan motor Fan motor connector Tester <Main PCB> AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) - 96 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 Is inverter PCB assembly Check inverter PCB assembly IPM normality normal? → Replace inverter PCB assembly Recheck power and installation condition - 97 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 < Noise Filter wiring Check Point > < Main PCB wiring Check Point > < Input Power Source Check Point > - 98 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 AUUQ42GH1/ AUUQ48GH1/ AUUQ54GH1 (ATUQ42GMLE3/ ATUQ48GMLE3/ ATUQ54GMLE3) (AVUQ42GLLA0/ AVUQ48GLLA0/ AVUQ54GLLA0) (ABUQ42GRLA0/ ABUQ48GRLA0/ ABUQ54GRLA0) < Input Power Source Check Point > - 99 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 June, 2013 P/NO : MFL67478303...

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