LG ABNW85GB9A0 Svc Manual
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LG ABNW85GB9A0 Svc Manual

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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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  • 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

    1. Self-diagnosis Function ....................29 2. Pump Down ........................33 3. Evacuation ........................34 4. Gas Charging......................35 5. Cycle Part........................36 6. Electronic Parts......................37 - 2 - 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 ......................4 2. Model Line Up ........................7 3. Nomenclature........................8 - 3 - Copyright ©2014 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 ©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. - 5 - 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. - 6 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 7: Model Line Up

    Total capacity index of 23.0 20.0 connectable indoor units(kW) Power supply 3Ø, 380 - 415V, 50Hz 3Ø, 380 - 415V, 50Hz Chassis - 7 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 8: Nomenclature

    Model Type C : Cooling Only H : Heat Pump W: Inverter Heat Pump R410A Single A Outdoor Unit - 8 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 Model type W : Inverter Cooling capacity (kBtu/h) Type U : Outdoor units Model type U : Universal model - 9 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 10: Part 2 Functions & Controls

    4.8 Timer(On/Off) ......................21 4.9 Weekly Program......................22 4.10 Two Thermistor Control.....................24 5. Special Function & KIT ....................25 5.1 Low Ambient control....................25 - 10 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: List Of Functions & Accessory

    Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 11 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 12 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 13: Installation Functions

    • It does not work to setup ESP value for very low/power step for some products. • ESP value is available for specific range belongs to the product. - 13 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 - Static Pressure (Code 06) setting will not be used if Static Pressure Step (Code 32) setting is being used. - For the static pressure value for each step, refer to the next page Table. 1 - 14 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 15 * If it is zero static pressure, please set value below Maximum value. Model Maximum value ABNW85GB9A0 [UB85 N94] ABNW70GB9A0 [UB70.N94] - 15 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: Reliability

    Compressor OFF Temp. ➔ Setting Temp-0.5°C • In 10-min dehumidification operation, the indoor fan operates with the low airflow speed. - 16 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Convenience Functions & Controls

    Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 17 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 19: 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. - 19 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 20: 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. - 20 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 22: Weekly Program

    Please move to 'minute' setup part of turning on by using button. If 'minute' indication blinks, please setup 'minute' by using button - 22 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 (Temperature selection range : 18℃~30℃) - When desired temperature is not set, it is turned on automatically with desired temperature of previous operation. - 23 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 25: Special Function & Kit

    • It can prevent frosting of evaporator and keep cooling operation Outdoor pipe T2°C T1°C Outdoor Setting Setting Setting Speed Fan Speed Speed Speed - 25 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 26: Part 3 Basic Control

    Part 3 Basic Control Part 3 Basic Control 1. Normal operation......................27 2 Compressor control ......................27 3. EEV( Electronic Expansion Valve) control ..............27 - 26 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Normal Operation

    ＊Heating mode the target temperature of discharge pipe = T condenser + α T condenser : condenser temperature (℃) - 27 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 28: Part 4 Trouble Shooting

    6.3 The Compressor/Outdoor Fan are don't operate ............39 6.4 When indoor Fan does not operate................40 6.5 Troubleshooting Indoor Error ..................41 6.6 Troubleshooting Outdoor Error ..................45 - 28 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 29: Self-Diagnosis Function

    • Remote Control Power is repeated On/Off If this phenomenon is generated, check the condition of N phase wiring - 29 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Error Indicator (Outdoor)

    1 Sec. 1 Sec. 1 Sec. 1 Time 1 Time 1 Time LED02G (GREEN) 2 Sec. 2 Sec. 7 Segment - 30 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 High pressure Sensor Error Stop CH43 4 times 3 time Flashing Flashing Outdoor Inlet Sensor Error Stop CH44 4 times 4 times - 31 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 Stop CH71 Unit 7 times 1 time Flashing Flashing PSC/PFC Over-Current Error (SW) Stop CH73 7 times 3 times - 32 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 33: Pump Down

    Pump Down Complete Gas Valve Closed (Red LED Off, Green LED On) Power off (Red LED Off, Green LED On) - 33 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 34: Evacuation

    Oxygen and do not use Flammable gases. pump). Otherwise, it may cause fire or explosion. - Otherwise, it may cause personal injury. - 34 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 36: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 36 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 37: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC4.5V↑ - 37 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 38: 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 - 38 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

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

  • Page 41: Troubleshooting Indoor Error

    Pipe temp sensor: 10°C = 10kΩ : 25°C= 5kΩ : 50°C= 1.8kΩ Measure the resistance of outlet pipe temp CN-ROOM sensor. CN-PIPE/IN CN-PIPE/OUT - 41 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 42 *** After replacing indoor unit PCB, do Auto Addressing & input unit’s address if connected to central controller. (All the indoor units connected should be turned on before Auto Addressing Checking communication cable connection status CN-REMO - 42 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 43 Part 4 Trouble Shooting 6.5 Troubleshooting Indoor Error CH 09 (Indoor unit EEPROM error) - 43 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 44 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 44 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Troubleshooting Outdoor Error

    DC link detection circuit fault. Improper power input, IGBTM connection fault, and insufficient distance Others between heat sink and control panel. - 45 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 46 PCBA link voltage state detection circuit IGBTM ※ Checking screws for no connection or unfastening - 46 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 47 (2 sides) More than 700mm More than 300mm More than More than 600mm 600mm More than More than 300mm 300mm - 47 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 EEV when the power is applied for the first time. SVC Valve SVC Valve Full Open Check EEV Check Replacing EEV - 48 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 49 (When incapable of using a digi- the inverter board. tal tester) * Check coil resistor and insula- tion resistor. Figure 2. - 49 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 50 W W W U U U V V V U U U V V V W W W [Compressor] [Inverter PCB] - 50 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 (Refer to P.53) Is Inv. PCB → Replace Comp PCB assembly if normal? abnormality found. Recheck power and installation condition - 51 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 Inv. PCB Diode 0.4 V ~ 0.6 V L1 ↔ N / L2 ↔ N / L3 ↔ N - 52 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 53 - 53 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 54 Part 4 Trouble Shooting ■ 4-Way Check Point 4Way Check 220V - 54 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 55 Part 4 Trouble Shooting LGMV Display - 55 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 56 (red-white, red-yellow, red-orange, red-blue) misconnection 2. If the estimated resistance value is in 52±3Ω then the EEV is normal - 56 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 57 → Check Inv. PCB IGBTM normality. (Refer to P.53) normal? → Replace Comp PCB assembly if abnormality found. Recheck power and installation condition - 57 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 58 Part 4 Trouble Shooting * Check DC_Link Connector joining condition * Measuring input voltage - 58 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 59 Short between compressor coil and sash, abrasion of compressor, and Expected Compressor short/opening of compressor coil. Causes Input current detection circuit fault. Assembly Others Input of low-voltage. - 59 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 60 Check Inv. PCB IGBTM normality Is Inv. PCB → Replace Inv. PCB normal? 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 61 * Measuring input voltage each terminal of compressor * Compressor wire connector connection * Check DC_Link Connector joining condition - 61 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 62 Installation fault and input of low-voltage power Expected Causes Damage of DC link voltage detection circuit and reactor terminal Assembly connection error - 62 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 63 → Check Inv. PCB IGBTM normality. (Refer to P.53) normal? → Replace Comp PCB assembly if abnormality found. 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 64 Part 4 Trouble Shooting * Check DC_Link Connector joining condition * Measuring input voltage - 64 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 65 3. Check wire disconnection and wiring → Reassemble if abnormality found Replace Inv. PCB Inv. PCB LED display error Recheck power and installation condition - 65 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 66 IGBTM parts fault, compressor current detection circuit fault, and DC Assembly link detection circuit fault Input of abnormal power, IGBTM connection fault, and power Others connection fault - 66 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 67 → Reassemble if abnormality found Check Inv. PCB IGBTM normality Is Inv. PCB normal? → Replace Inv. PCB Recheck power and installation condition - 67 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 Part 4 Trouble Shooting * Measuring resistance between each terminal of compressor * Compressor wire connection - 68 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 Input of abnormal power, power connection fault, reactor terminal con- Others nection fault, and faulty distance between heatsink and sash - 69 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 Distance Checking input Checking between current detection PCBA heatsink and circuit panel ※ Not less than 6mm of distance - 70 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 Compressor current detection circuit fault, DC link detection circuit fault, Assembly and fault of single unit of IGBTM Others Input of abnormal power and power connection fault - 71 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 Check Inv. PCB IGBTM normality Is Inv. PCB normal? → Replace Inv. PCB Recheck power and installation condition - 72 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 Part 4 Trouble Shooting * Measuring resistance between each terminal of compressor * Measuring input voltage * Compressor wire connection - 73 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Compressor current and DC link voltage detection circuit fault Assembly Sensor Discharge temperature sensor fault - 74 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 Checking Checking Checking Checking compressor compressor compressor compressor phase insulation wiring resistance resistance Checking Checking outdoor PCBA Temperature sensor - 75 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 Replace Inv. PCB assembly Is Inv. PCB assembly normal? Recheck power and installation condition * Measuring input voltage * Inv. PCB assembly - 76 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 3. Sensor insulation resistance : The resistance between the sash and sensor terminal should be not less than 1MΩ. - 77 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 - Position : Rear part of outdoor device Outdoor temperature sensor - Sensor value : 10kΩ ± 10% (Based on 25℃) Ω - 78 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 Voltage of 5V is output PCB checking and replacement from the PCB? No malfunction of the pressure Replace the pressure sensor sensor - 79 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Damage of and Chassis Panel power source wire coating Replacement of LED Off inverter PCB Replacement of main PCB - 80 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 Is there any error 1. Replace Main PCB when power reset? Recheck power and installation condition Main PCB Inv. PCB Communication wire - 81 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 Replacing Communication Communication indoor Grounding cable length cable length If length is 50m over, Please separate communication wire - 82 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 Check reactor connection state. Check fuse state Check whether outdoor PCB LED is lighted. Fuse Point - 83 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 Neutral Wire-to-Wire Wire tongue-termination fault. Communication noise by oxidized wire arrangement : Soldering is required. Neutral - 84 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 Part 4 Trouble Shooting ↔ ↔ ↔ ↔ ∞ ∞ Ω Ω - 85 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 Neutral and Pipe Pipe ∞ ∞ Ω Ω Check Resistance Check Resistance Communication Line and Pipe Pipe ∞ Ω - 86 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 - If N phase wiring is bad, correct the N phase wire and check the generation of CH53 one more N phase wire - 87 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 6.6 Troubleshooting Outdoor Error CH 05/53 (Indoor/Outdoor Device Communication Error) → Detection by indoor devices - 88 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 -. It helps outdoor unit communicate with indoor unit better than before and reduce the noise level Connector with capacitor in CN_FLASH and CN_CNVSS - 89 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 Part 4 Trouble Shooting [Phenomenon] 1) Red LED off 2) Red LED turn on but not blinking [ PCBA P/NO] EBR79182301 EBR78088701 - 90 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 Checking for open and reverse phase ※ Refer to 112 page Fuse damage AC load (R and S phases) Inverter PCB - 91 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 N-phase N-phase N-phase N-phase unavaila unavaila unavaila phase availab N-phase N-phase N-phase phase phase phase unavaila availa availa availa - 92 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 - Operation with replacement of R and S phases only Black White Red blue Black White Red blue Black White Red blue White Black Red blue - 93 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 Prompt generation just after power resetting EEPROM Checking connection state Replacing PCB How to check the EEPROM assembling state of outdoor devices - 94 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 Part 4 Trouble Shooting - 95 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 Checking EEV for Pipe Checking fan Cycle proper working blocking for working Properties Sensor of unit Replacing - 96 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 Replace Inv. PCB Assembly Recheck Power and Installation Condition ■ Check Inv. PCB Screw Connection Condition Check Screw Connection Condition - 97 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 1. Replace Inv. PCB Assembly normal? Recheck Power and Installation Condition * Measuring input voltage * Inv. PCB assembly - 98 - Copyright ©2014 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 February, 2015 P/NO : MFL67478319...

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