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LG ATNH09GRLE2 Svc Manual
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LG ATNH09GRLE2 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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Summary of Contents for LG ATNH09GRLE2

  • 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) ............59 4. Gas Charging (After Evacuation)................60 5. Cycle Part........................61 6. Electronic Parts......................62 - 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........................11 - 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

    [CQ09 NA0] [CQ12 NA0] [CQ18 NA0] APNH48GTLA0 Floor standing [UP48 NT2] AJNW30GVLA0 AJNW36GVLA0 Wall mounted [UJ30 NV2] [UJ36 NV2] - 7 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 8 ABNH18GL2A2 [CB18L N22] ABNH24GL3A2 [CB24L N32] • Floor Standing • Wall mounted APNH48GTLA0 [UP48 NT2] AJNW30GVLA0 [UJ30 NV2] AJNW36GVLA0 [UJ36 NV2] - 8 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 1 ~ 4 Total capacity index of 12.5 14.0 15.0 connectable indoor units(kW) Power supply 1Ø, 220 - 240V, 50Hz Chassis - 9 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 10 1 ~ 4 Total capacity index of 12.5 14.0 15.0 connectable indoor units(kW) Power supply 3Ø, 380 - 415V, 50Hz Chassis - 10 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 11: Nomenclature

    C : Cooling Only H : Heat Pump U: Single A Decoration Panel of Ceiling Cassette Type Indoor Unit - 11 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 12 H : H/P Q : DC Inverter C/O W : DC Inverter H/P Indicates that this is a R410A outdoor unit - 12 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 C : Cooling Only H : Heat Pump U: Single A Decoration Panel of Ceiling Cassette Type Indoor Unit - 13 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 14 Model type W : Inverter Cooling capacity (kBtu/h) Type U : Outdoor units Model type U : Universal model - 14 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Part 2 Functions & Controls

    6.11 Two Thermistor Control .....................49 7. Special Function & KIT ....................50 7.1 Low Ambient control....................50 7.2 Space Control ......................50 7.3 Auto Elevation Grille....................50 - 15 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 16: 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 - 16 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 17 PI 485(for Indoor Unit) Zone controller Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 Others Telecom shelter controller - 17 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 18 Zone controller ABZCA Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 Others Telecom shelter controller - 18 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 19 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 20 Zone controller Special CTI(Communication transfer interface) function kit Electronic thermostat Remote temperature sensor PQRSTA0 PQRSTA0 Others Telecom shelter controller - 20 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 21 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate pack- age. - 21 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 22 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 22 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 23 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 24 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 24 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 25 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 26 Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 26 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 27: Air Flow

    Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 27 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 29: 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 - 29 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 30: Installation Functions

    <Static Pressure Setting Table> Function Pressure selection Zone state ESP standard value Variable High Fixed High Variable Fixed - 30 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 31 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. - 31 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 32 - 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 - 32 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 33 Setting Value 4(49) 6(59) 8(78) 10(98) 20.8 23.2 19.5 26.0 21.5 23.5 19.1 26.3 21.6 24.0 19.9 27.0 22.7 25.9 - 33 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 34 6(59) 8(78) 10(98) 12(118) 14(137) 41.3 45.4 39.7 49.5 44.1 38.6 48.5 44.2 38.9 49.8 44.7 42.2 50.5 48.1 - 34 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 35 * If it is zero static pressure, please set value below Maximum value. Model Maximum value ABNW18GM1A0 ABNW24GM1A0 ABNW30GM1A0 ABNW36GM2A0 ABNW42GM2A0 - 35 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 36 High ABNH48GRLA2 10(98) 35.0 5(49) 12(118) (factory set) 30.0 50.0 High 45.0 ABNH60GRLA2 10(98) 6(59) 14(137) (factory set) 40.0 - 36 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 37 16.19 22.75 20.86 18.44 Note : 1. The above table shows the correlation between the air rates and E.S.P. - 37 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 38 24.5 22.6 20.9 19.9 Note : 1. The above table shows the correlation between the air rates and E.S.P. - 38 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 39 36.8 43.1 41.2 45.6 Note : 1. The above table shows the correlation between the air rates and E.S.P. - 39 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 40: 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. - 40 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 41: Reliability

    -0.5°C 18°C ≤ intake air temp. < 22°C intake air temp. intake air temp. < 18°C 18°C - 41 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 42: Convenience Functions & Controls

    Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 42 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 43: 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. - 43 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 44: 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. - 44 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: 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. - 45 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 47: Weekly Program

    Please move to 'minute' setup part of turning on by using button. If 'minute' indication blinks, please setup 'minute' by using button - 47 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 48 (Temperature selection range : 18℃~30℃) - When desired temperature is not set, it is turned on automatically with desired temperature of previous operation. - 48 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

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

  • Page 50: 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. - 50 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 51 • In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval, Remote Controller operation is infeasible. - 51 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 52 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. - 52 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Part 3 Basic Control

    Part 3 Basic Control 3. Basic Control 1. Normal operation......................54 2 Compressor control ......................54 3. EEV( Electronic Expansion Valve) control ..............54 - 53 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 54: Normal Operation

    ＊Heating mode the target temperature of discharge pipe = T condenser + α T condenser : condenser temperature (℃) - 54 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 55: Part 4 Trouble Shooting Guide

    6.4 When indoor Fan does not operate................65 6.5 When the louver does not operate................66 6.6 Troubleshooting Indoor Error ..................67 6.7 Troubleshooting Outdoor Error ..................73 - 55 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 56: Self-Diagnosis Function

    EEPROM of Indoor unit is 0 or FFFFFF Disconnecting the fan motor connector/ Abnormal fan motor operation Failure of indoor fan motor lock - 56 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 57: Error Indicator (Outdoor)

    Within 1h Flashing 4 Flashing 4 1 time Outdoor Inlet Sensor Error Stop CH44 times times Within 1h - 57 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 58: Pump Down

    Pump Down Complete Gas Valve Closed (Red LED Off, Green LED On) Power off (Red LED Off, Green LED On) - 58 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 59: 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. - 59 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 60: 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. - 60 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 61: Cycle Part

    2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 61 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 62: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC4.5V↑ - 62 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 63: 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 - 63 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 64: 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. - 64 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 65: 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 - 65 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 66: 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 - 66 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 67: Troubleshooting Indoor Error

    CN-PIPE IN : Pipe inlet temp sensor CN-PIPE OUT : Pipe outlet temp sensor Measure the resistance of outlet pipe temp sensor. - 67 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 68 CN-REMO : Remote controller connection The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 68 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 69 * If the float goes up higher than a half of float switch then the circuit is open & the unit is stopped automatically. (High position Open) float Condensate water - 69 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 70 (Check input of 220V) (Marked as CN-DPUMP) Float switch Housing (CN-FLOAT) [***] Standard of drain pipe head height / slope MAX 450 - 70 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 4. Trouble Shooting 6.6 Troubleshooting Indoor Error CH 09 (Indoor unit EEPROM error) - 71 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 72 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 72 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 73: Troubleshooting Outdoor Error

    DC link detection circuit fault. Improper power input, IPM connection fault, and insufficient distance Others between heat sink and control panel. - 73 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 74 Checking Checking Checking Compressor Checking Checking DC single connection current PCBA link voltage unit of IPM state detection circuit - 74 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 When the front/back has a wall (1 side) When the front/back/left/right have walls (3 sides) When the front/back/left/right have walls (2 sides) - 75 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 76 Replacing a part of or Check pipes the entire pipes SVC Valve SVC Valve Full Open Check EEV Check Replacing EEV - 76 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 0.628 ±7% 0.438 ±7% 0.859 ±7% ( at 25 W-U 1.040 ±7% 1.125±7% 0.628 ±7% 0.438 ±7% 0.864 ±7% - 77 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 78 4. Trouble Shooting How to check the compressor wiring error V (Blue) (Yellow) (Red) - 78 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 79 Normal Sequence of Normal Measurement Measurement Measurement Standards Measurement Standards 0.4V~0.6V U-Nu 0.4V~0.6V 0.4V~0.6V V-Nv 0.4V~0.6V 0.4V~0.6V W-Nw 0.4V~0.6V - 79 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 80 Check the voltage for being in the range of 0.4~0.6V. Judge IPM Pins for short. IPM Check Point IPM Check Point P U V W 2/2.5kW - 80 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 81 4. Trouble Shooting IPM Check Point P W V U - 81 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 82 4. Trouble Shooting IPM Check Point - 82 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 83 Apply the electricity. Turn indoor devices off. Measure voltage. Within 2.3 ~2.7V Current detection Replace PCBA. part is normal. - 83 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 84 4. Trouble Shooting Current Detection Circuit Check Point Compressor Phase Current Detection Comp Current 2/2.5kW Comp U - 84 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 85 4. Trouble Shooting Compressor Phase Current Detection - 85 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 86 4. Trouble Shooting Compressor Phase Current Detection - 86 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 87 CH 21 (DC Peak / Comp IPM Fault) Checking the output voltage of CN-4way (refer to next page) Check the 4-way.valve coil resistance. - 87 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 88 4. Trouble Shooting 4-Way Check Point 4Way Check CN-4Way 2/2.5kW CN-4Way - 88 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 89 4. Trouble Shooting Compressor Phase Current Detection CN-4Way CN-4Way - 89 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 90 4. Trouble Shooting Compressor Phase Current Detection CN-4Way - 90 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 91 4. Trouble Shooting LGMV Display - 91 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 92 45 ±5 45 ±5 [Pin No.] Measurement Pin Normal Standard 45 ±5 45 ±5 45 ±5 45 ±5 [Pin No.] - 92 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 93 CH 21 (DC Peak / Comp IPM Fault) Apply the electricity. Turn indoor devices off. Measure voltage. Within 2.3~2.7V Current detection Replace PCBA. part is normal. - 93 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 94 4. Trouble Shooting DC Link Detection Circuit Check Point DC Link Detection Circuit Check Point DC_ Link 2/2.5kW DC_ Link - 94 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 95 4. Trouble Shooting DC Link Detection Circuit Check Point DC_LINK DC_LINK - 95 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 96 4. Trouble Shooting DC Link Detection Circuit Check Point DC LINK-Voltage _ INV - 96 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 97 4. Trouble Shooting Controller Voltage 2~6kW 140V 380V - 97 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 98 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. - 98 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 99 Checking Checking compressor compressor compressor compressor phase resis- insulation wiring tance resistance Checking input Checking current PCBA detection circuit - 99 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 100 CH 22 (Input of Over Current) Apply the electricity. Turn indoor devices off. Measure voltage. Within 2.3~2.7V Current detection Replace PCBA. part is normal. - 100 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 101 4. Trouble Shooting Input Current Detection Point Input_I 2/2.5kW I_CT - 101 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 102 4. Trouble Shooting Input Current Detection Point CT_INV INPUT(CT) - 102 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 103 4. Trouble Shooting Input Current Detection Point Input_Current_T_PFC Input_Current_R_PFC DC LINK-Voltage _ INV - 103 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 104 4. Trouble Shooting LGMV Display Controller Current Level 2.5kW - 104 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 105 Installation fault and input of low-voltage power Expected Causes Damage of DC link voltage detection circuit and reactor terminal Assembly connection error - 105 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 106 Model only) Checking the wire Installation coating of power source Checking Checking Checking compressor compressor PCBA phase resis- wiring tance - 106 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 107 4. Trouble Shooting 6.7 Troubleshooting Outdoor Error CH 23 (DC Link Voltage Low) Reactor Connector Point 2/2.5kW - 107 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 108 How to check PFCM IGBT (Diode Mode) Sequence of Normal Sequence of Normal Measurement Measurement Measurement Standards Measurement Standards 0.4V~0.6V U-Nu 0.4V~0.6V 0.4V~0.6V V-Nv 0.4V~0.6V - 108 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 109 Normal Sequence of Normal Measurement Measurement Measurement Standards Measurement Standards 0.4V~0.6V U-Nu 0.4V~0.6V 0.4V~0.6V V-Nv 0.4V~0.6V 0.4V~0.6V W-Nw 0.4V~0.6V - 109 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 110 4. Trouble Shooting PFCM Point PFCM Point - 110 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 111 4. Trouble Shooting PFCM Point IPM Check Point - 111 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 112 IPM parts fault, compressor current detection circuit fault, and DC link Assembly detection circuit fault Input of abnormal power, IPM connection fault, and power connection Others fault - 112 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 113 Checking Checking Checking Compressor Checking Checking DC single connection current PCBA link voltage unit of IPM state detection circuit - 113 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 114 Input of abnormal power, power connection fault, reactor terminal con- Others nection fault, and faulty distance between heatsink and sash - 114 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 115 Distance Checking input Checking between current detection PCBA heatsink and circuit panel - 115 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 116 Compressor current detection circuit fault, DC link detection circuit fault, Assembly and fault of single unit of IPM Others Input of abnormal power and power connection fault - 116 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 117 Checking Checking Checking Compressor Checking Checking DC single connection current PCBA link voltage unit of IPM state detection circuit - 117 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 118 Compressor current and DC link voltage detection circuit fault Assembly Sensor Discharge temperature sensor fault - 118 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 119 Checking Checking Checking Checking compressor compressor compressor compressor phase insulation wiring resistance resistance Checking Checking outset PCBA Temperature sensor - 119 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 120 Outdoor air temperature sensor Open/Short Outdoor piping temperature sensor Open/Short Outdoor suction temperature sensor Open/Short Constant rate outlet temperature sensor Open/Short - 120 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 121 6.7 Troubleshooting Outdoor Error Compressor discharge sensor Pipe sensor Compressor Pipe sensor inlet sensor Ω Ω Ω Outdoor temperature sensor Ω - 121 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 122 Voltage of 5V is output PCB checking and replacement from the PCB? No malfunction of the pressure Replace the pressure sensor sensor - 122 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 123 "Maximum Model Name total capacity" MU2M15 MU2M17 MU3M19 MU3M21 MU4M25 MU4M27 MU5M30 MU5M40 FM40AH FM48AH FM56AH FM41AH FM49AH FM57AH - 123 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 124 Damage of and Chassis Panel power source wire coating Replacement of LED Off inverter PCB Replacement of main PCB - 124 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 125 : Interference with wires or wire coating damage with chopping Inverter PCB LED : Replacement of inverter PCB during LED Off after resetting - 125 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 126 Check LGMV Wire tongue Installation connection Communication termination state rate Replacing Communication Communication indoor Grounding cable length cable length - 126 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 127 CH 05/53 (Indoor/Outdoor Device Communication Error) → Detection by indoor devices Fuse Point 2/2.5kW PCBA Fuse PCBA Fuse PCBA Fuse - 127 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 128 Neutral Wire-to-Wire Wire tongue-termination fault. Communication noise by oxidized wire arrangement : Soldering is required. Neutral - 128 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 129 4. Trouble Shooting ↔ ↔ ↔ ↔ ∞ ∞ Ω Ω - 129 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 130 Neutral and Pipe Pipe ∞ ∞ Ω Ω Check Resistance Check Resistance Communication Line and Pipe Pipe ∞ Ω - 130 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 131 4. Trouble Shooting 6.7 Troubleshooting Outdoor Error CH 05/53 (Indoor/Outdoor Device Communication Error) → Detection by indoor devices - 131 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 132 (Refer to PCB P/no of attached file) Applied S/No : ~ 301xxxxxx (~ Jan, 2013) 1. Symptom 2. Causes 3. Improvement - 132 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 133 4. Trouble Shooting PCBA P/NO EBR362668** EBR356522** EBR481682** EBR610154** EBR614818** EBR633722** EBR652505** EBR683491** EBR723989** EBR753611** EBR741383** - 133 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 134 Checking N-phase phase loss Checking for open and reverse phase Fuse damage AC load (R and S phases) Inverter PCB - 134 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 135 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 - 135 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 136 CH 54 (Open and Reverse Phase Error) Brown B Black Green Brown B Black Green Brown B Black Green Green - 136 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 137 Prompt generation just after power resetting EEPROM Checking connection state Replacing PCB How to check the EEPROM assembling state of outdoor devices - 137 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 138 4. Trouble Shooting EEPROM Position 2/2.5kW - 138 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 139 Checking EEV for Pipe Checking fan Cycle proper working blocking for working Properties Sensor of unit Replacing - 139 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 140 Installation Whether to shield Outdoor Fan Checking for proper working Restoration of Checking for proper working temperature Replacing PCB - 140 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 141 6.7 Troubleshooting Outdoor Error CH 62 (Heat sink High Error) Controller Current Level All PCBA 95℃ ↑ 85℃ ↑ - 141 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 142 Items for checking Sub-items for checking Working Temperature Outdoor Temperature Replacing PCB Environmental factor checking method Sensor checking method - 142 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 143 4. Trouble Shooting Heat sink Tempe Sensor Point #14,16 2/2.5kW #19,20 Ω #19,20 Ω #19,20 Ω - 143 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 144 Damage of fan motor driving circuit Trouble Checking Flow Sub-items for checking Items for checking Outdoor Fan Outdoor fan damage Connection state PCBA Cautions - 144 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 145 How to check the outdoor fan motor of BLDC Tester (±10%) Dozens k Dozens k ~hundreds k ~hundreds k Dozens k Dozens k ~hundreds k ~hundreds k - 145 - Copyright ©2013 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 146 December, 2013 P/NO : MFL67478301...

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