LG CT09F Service Manual
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LG CT09F Service Manual

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SINGLE CAC
Air Conditioner
SERVICE MANUAL
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
CONFIDENTIAL
(General)

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Summary of Contents for LG CT09F

  • Page 1 SINGLE CAC Air Conditioner SERVICE MANUAL (General) CAUTION Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 2: Table Of Contents

    2. Pump Down ........................55 3. Evacuation (All amount of refrigerant leaked) ............56 4. Gas Charging (After Evacuation)................57 5. Cycle Part ........................58 6. Electronic Parts......................58 - 2 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Part 1 General Information

    Part 1 General Information 1. Safety Precautions ......................4 2. Model Line Up ........................13 3. Nomenclature........................16 - 3 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only 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 © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 • The appliance shall be stored in a well-ventilated area where the room size corresponds to the room area as specified for operation • Compliance with national gas regulations shall be observed - 5 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 Have a dry powder or CO2 fire extinguisher adjacent to the charging area. - 6 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 This shall be reported to the owner of the equipment so all parties are advised. - 7 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 A halide torch (or any other detector using a naked flame) shall not be used. - 8 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 Ensure that the outlet for the vacuum pump is not close to any ignition sources and there is ventilation available. - 9 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and checked. - 10 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 Do not tilt the unit when removing panels. Otherwise, the water inside the unit can spill and wet floor. - 11 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor. - 12 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 13: Model Line Up

    High UV18FH Ceiling Suspended Standard UV36F UV42F UV48F UV60F Compact High UV24FH UV30FH UV36FH UV42FH Standard Console UQ09F UQ12F UQ18F Compact - 13 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 (4 Parts) Cycle PCB 12.0 (42) UUD3 3Φ, 380-415 V~, 50Hz Inverter PCB 13.4 (48) Fan PCB Noise Filter 14.6 (60) - 14 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 CT12F ● ● CT18F ● CT24F ● UUD1 UT30F ● ● CL12F / UUD3 ● ● CM18F ● CM24F ● UM30F - 15 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Nomenclature

    A : 9~18 B : 18~30 C : 24~36 D : 36~60 Type U : Outdoor unit Model Type U : Universal model - 16 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 F : Floor Detecting + Air Cleaning Chassis A : TM-A, TP-B Q : TR, TQ Decoration Panel of Ceiling Cassette Type Indoor Unit - 17 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 • m : Total refrigerant amount in the system • Total refrigerant amount : factory refrigerant charge + additional refrigerant amount • Amin : minimum area for installation - 18 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 19 123.90 469.87 13.77 52.21 9.22 34.95 137.29 495.61 15.25 55.07 10.21 36.86 151.36 522.04 16.82 58.00 11.26 38.83 166.12 18.46 12.36 - 19 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 20: Part 2 Functions & Controls

    5.10 Weekly Program......................45 5.11 Two Thermistor Control .....................47 6. Special Function & KIT ....................48 6.1 Low Ambient control....................48 6.2 Space Control ......................48 - 20 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 21: List Of Functions & Accessory

    5. ** : It is included by default when the product is manufactured. 6. *** : This functions need to connect to the Standard III wired remote controller. - 21 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 22 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> Product >Control(BECON)) - 22 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 23 5. ** : It is included by default when the product is manufactured. 6. *** : This functions need to connect to the Standard III wired remote controller. - 23 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> Product >Control(BECON)) - 24 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 5. ** : It is included by default when the product is manufactured. 6. *** : This functions need to connect to the Standard III wired remote controller. - 25 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 26 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> Product >Control(BECON)) - 26 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 5. ** : It is included by default when the product is manufactured. 6. *** : This functions need to connect to the Standard III wired remote controller. - 27 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> Product >Control(BECON)) - 28 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 5. ** : It is included by default when the product is manufactured. 6. *** : This functions need to connect to the Standard III wired remote controller. - 29 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> ¡ Product >Control(BECON)) - 30 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 5. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Doc.Library> Product > Control(BECON)) - 31 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 32: Air Flow

    Mode9 Mode8 Mode7 Mode6 Mode5 Mode4 Mode3 7~8° Mode2 OPEN NOTE: Some Models are different by swing width and swing pattern. - 32 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 33: 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) - 33 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 34: Installation Functions

    - 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. - 34 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 - The values in the table are based on electrical rated conditions. Therefore, if there is a fluctuation in voltage, the air flow rate may change. - 35 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 - The values in the table are based on electrical rated conditions. Therefore, if there is a fluctuation in voltage, the air flow rate may change. - 36 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 - The values in the table are based on electrical rated conditions. Therefore, if there is a fluctuation in voltage, the air flow rate may change. - 37 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 38: High Ceiling Operation

    • Ceiling height of ‘Very high’ function may not exist depending on the indoor unit. • Refer to the product manual for more details. - 38 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 39: Reliability

    -0.5 °C 18 °C ≤ intake air temp. < 22 °C intake air temp. intake air temp. < 18 °C 18 °C - 39 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 40: Convenience Functions & Controls

    Thermo ON : Setting temp. Thermo OFF : +4 °C above setting temp. Thermo OFF : +3 °C above setting temp. - 40 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 41: 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. - 41 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 42: 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. - 42 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 43: 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. - 43 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 44: 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. - 44 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 45: Weekly Program

    Please move to 'minute' setup part of turning on by using button. If 'minute' indication blinks, please setup 'minute' by using button - 45 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 * Indoor unit is turned on to desired temperature if it is configured using up/down button during preset of weekly operation time. - When desired temperature is not set, it is turned on automatically with desired temperature of previous operation. - 46 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 47: 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. - 47 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 48: Special Function & Kit

    • Easily controlled by wired remote control. • Air Flow can be controlled easily regarding any space environment. - 48 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 49: Part 3 Basic Control

    Part 3 Basic Control 1. Normal operation......................50 2 Compressor control ......................50 3. EEV( Electronic Expansion Valve) control ..............50 - 49 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 50: Normal Operation

    (current evaporating temperature) + T (Suction Superheating temperature) • P : Absolute High pressure (kPa) high • P : Absolute low pressure (kPa) - 50 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 6.4 When indoor Fan does not operate................61 6.5 When the louver does not operate................62 6.6 Troubleshooting Indoor Error ..................63 6.7 Troubleshooting Outdoor Error ...................69 - 51 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 52: Self-Diagnosis Function

    (GREEN) 2 seconds 2 seconds Standard Inverter : Standard Inverter : 18k 9k/12k/24k/36k/42k/48k/60k Compact Inverter : 24k/30k Compact Inverter : 18k - 52 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 53: Error Indicator (Outdoor)

    Stop restart D-Pipe Sensor Error (INV. Comp.) Stop 1 time Within 1h High pressure Sensor Error Stop 1 time Within 1h - 53 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 54: Pump Down

    5) Close the Liquid valve only after green LED turned off (7 minutes from the start of the machine). Then close the gas valve after Green LED on. - 54 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 55: Evacuation (All Amount Of Refrigerant Leaked)

    Oxygen and do not use Flammable gases. Otherwise, it may cause fire or explosion. - Otherwise, it may cause personal injury. - 55 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 56: Gas Charging (After Evacuation)

    (pumping down-pin). - Any presence of foreign substance such as air can cause an abnormal pressure rise and may - 56 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 57: Cycle Part

    G (Cooling) at normal condition. (R32) 2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with putty. - 57 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 58: Electronic Parts

    4) Replace PCB Assembly 5) IC01A(KIA7036) 5) The voltage of micom pin 19 5) Replace PCB Assembly : DC 4.5 V↑ - 58 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 59: The Product Doesn't Operate With The Remote Controller

    * Check display PCB Assembly - Voltage between CN-DISP1 should be DC +5 V, - If problem still persists, Replace display PCB - 59 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 60: The Compressor/Outdoor Fan Are Don't Operate

    Turn off main power. Check the electrical wiring diagram of Outdoor side. Check the open or short of connecting wires between Indoor and Outdoor. - 60 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 61: When Indoor Fan Does Not Operate

    The voltage of Pin No 1(orange) and 3(black) of CN-FAN. About AC 160 V over About AC 50 V over SSR is not damaged Check SSR - 61 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 62: 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 - 62 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 63: Troubleshooting Indoor Error

    CN_PIPE_IN : Pipe inlet temp sensor CN_PIPE_OUT : Pipe outlet temp sensor CN_ROOM : Indoor air temp sensor Measure the resistance of outlet pipe temp sensor. - 63 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 64 CN_REMO : Remote controller connection The PCB can differ from model to model. Check from the right source. Checking communication cable connection status - 64 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 65 * 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 - 65 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 66 (Check input of DC 15 V) (Marked as CN_DCDRAIN) [***] Standard of drain pipe head height / slope 1/50~1/100 MAX 450 MAX 700 mm - 66 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 67 - Replace the indoor unit PCB, and then make sure to perform Auto addressing and input the address of central control - 67 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 68 (Notice: The connection of motor connector to PCB should be done under no power supplying to PCB) - 68 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 69 - Action: replace filter • Check the HVPS Feed Back voltage Is the HVPS signal normal? - Action: replace HVPS - 69 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 70: Troubleshooting Outdoor Error

    DC link detection circuit fault. Improper power input, IPM connection fault, and insufficient distance Others between heat sink and control panel. - 70 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 71 Checking DC single connection PCBA current link voltage unit of IPM state detection circuit ❈ Checking screws for no connection or unfastening - 71 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 72 300 mm 700 mm 1.2 m (Wind direction) ■ When the front/back/left/right have walls (3 sides) 300 mm 700 mm 300 mm - 72 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 73 EEV when the power is applied for the first time. SVC Valve SVC Valve Full Open Check EEV Check Replacing EEV - 73 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 74 5. If any disorder is found, measure the line resistance between the terminals of the compressor as shown below. 6. If the compressor is found to be normal, any compressor connection wire may have a fault. - 74 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 75 0.631±7 % Ω 0.758±7 % Ω (at 75 ℃) 1.620±7 % Ω 1.345±7 % Ω 0.631±7 % Ω 0.758±7 % Ω - 75 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 76 Check whether the PCB wires and compressor wires [Picture of normal compressor wiring] are connected in the same colors. [Picture of normal compressor wiring] - 76 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 77 5. If the measurements are significantly different from the levels shown in the figures, the IPM is deemed to be damaged. 0.3 V~0.5 V 0.3 V~0.5 V 0.3 V~0.5 V 0.3 V~0.5 V 0.3 V~0.5 V 0.3 V~0.5 V - 77 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 78 Judge IPM Pins for short. ■ IPM Check Point Division IPM Check Point 2 kW [IPM Pin Arrangement and Pin Numbers] - 78 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 79 Part 4 Trouble Shooting ■ IPM Check Point Division IPM Check Point 3 kW IPM Check Point 4 kW - 79 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 80 ■ IPM Check Point Division IPM Check Point 4.5kW COMP_IPM 6 kW 25 26 27 29 32 33 [IPM Pin Arrangement and Pin Numbers] - 80 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 81 IGBTM Low side Didoe 0.35 V Non-normal 0.7 V IGBTM Hige side IGBT IGBTM IGBTM Low side IGBT BLACK DC_Link IGBTM - 81 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 82 - 82 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 83 Part 4 Trouble Shooting ■ Current Detection Circuit Check Point Division Compressor Phase Current Detection Comp Current 2 kW 3 kW - 83 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 84 Part 4 Trouble Shooting ■ Current Detection Circuit Check Point Division Compressor Phase Current Detection INV_Current INV_Current INV_Current 4 kW 2.5 V Black - 84 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 85 Part 4 Trouble Shooting ■ Current Detection Circuit Check Point Division Compressor Phase Current Detection 6 kW 7 kW Inverter Current GND_INV - 85 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 86 - 86 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 87 Part 4 Trouble Shooting ■ 4-Way Check Point Division 4Way Check CN_4WAY_YL 2 kW 4 kW 4.5kW - 87 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 88 Part 4 Trouble Shooting ■ 4-Way Check Point Division 4Way Check 4 kW 6/7 kW - 88 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 89 Part 4 Trouble Shooting ■ LGMV Display When Heating, LED turn on When Cooling, LED turn off - 89 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 90 45 ±5 45 ±5 45 ±5 [Pin No.] ※ There may be the difference in the resistance depending upon the EEV Specifications. - 90 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 91 - 91 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 92 1. Check DC Link Sensing Signal measurements at Power-on standby state. (DC 2.4 ~ 2.8 V) 4 kW DC_LINK DC_LINK Black 4.5kW - 92 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 93 Part 4 Trouble Shooting ■ DC Link Detection Circuit Check Point Division DC Link Detection Circuit Check Point 6 kW 7 kW GND_INV Link_Voltage - 93 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 94 Controller Voltage 2~4 kW 140 V DC Link NG Voltage level Controller Voltage 6 kW 140 V 7 kW 380 V - 94 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 95 Short between compressor coil and Panel, abrasion of compressor, and Expected Compressor short/opening of compressor coil. Causes Input current detection circuit fault. Assembly Others Input of low-voltage. - 95 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 96 Checking Checking Checking Checking compressor compressor compressor compressor Phase resis- insulation wiring tance resistance Checking input Checking current PCBA detection circuit - 96 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 97 - 97 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 98 Part 4 Trouble Shooting Division Input Current Detection Point 2 kW 4 kW I_IN I_IN 2.5 V Black 4.5 kW - 98 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 99 Part 4 Trouble Shooting Division Compressor Phase Current Detection 6 kW 7 kW Input Current GND_INV - 99 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 100 ■ LGMV Display DC Link NG Voltage level Driver Current Level 3/4kW 4.5kW Cooling Mode : 12A Heating Mode : 14A - 100 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 101 Installation fault and input of low-voltage power Expected Causes Damage of DC link voltage detection circuit and reactor terminal Assembly connection error - 101 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 102 ❈ Check the wire for possible coat chopping and short. Checking Checking DC Checking Link voltage reactor connection charging PCBA circuit state - 102 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 103 CH 23 (DC Link Voltage Low) Checking Reactor Connection Division Reactor Connector Point 2 kW 3 kW 4.5 kW 6 kW 7 kW - 103 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 104 A – C 0.3 V~0.5 V ❈ C : Collector / E : Emitter ❈ A : Anode / C : Cathode - 104 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 105 0.4 V~0.6 V + - ~ 0.4 V~0.6 V _ - ~ 0.4 V~0.6 V + - ~ 0.4 V~0.6 V - 105 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 106 Part 4 Trouble Shooting ■ B/Diode of Discrete PFC Point Division PFCM Point 6 kW 4.5 kW 2 kW 3 kW - 106 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 107 IGBTM Low side Didoe 0.35 V Non-normal 0.7 V IGBTM Hige side IGBT IGBTM IGBTM Low side IGBT BLACK DC_Link IGBTM - 107 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 108 (Outdoor covering during the cooling mode / Indoor unit filter clogging during the heating mode) 8. SVC valve clogging 9. Defective outdoor PCB - 108 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 109 Is high pressure of LGMV similar as Replace high pressure switch at manifold gauge? Check pipe is blocked or not and take measure - 109 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 110 3 kW 3 kW 6/7 kW(Main) 6 kW(Inv) 7 kW(Inv) Note2 Check Point Normal : Short Abnormal : Open High pressure switch - 110 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 111 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 - 111 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 112 Checking DC single connection current PCBA link voltage unit of IPM state detection circuit ❈ Checking screws for no connection or unfastening - 112 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 113 Input of abnormal power, power connection fault, reactor terminal con - Others nection fault, and faulty distance between heatsink and sash - 113 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 114 Checking compressor compressor compressor compressor phase insulation wiring resistance resistance Checking Checking input Checking PFC circuit current detection PCBA part circuit - 114 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 115 A – C 0.3 V~0.5 V ❈ C : Collector / E : Emitter ❈ A : Anode / C : Cathode - 115 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only 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 © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 117 Checking DC single connection current PCBA link voltage unit of IPM state detection circuit ❈ Checking screws for no connection or unfastening - 117 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 118 Compressor current and DC link voltage detection circuit fault Assembly Sensor Discharge temperature sensor fault ❈ IPM (Intelligent Power Module) : The part to control the inverter compressor - 118 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 119 ❈ Refer to manifold gauge Checking Checking Checking Checking compressor compressor compressor compressor phase insulation wiring resistance resistance Checking Checking outset PCBA Temperature sensor - 119 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 120 Indoor unit or outdoor unit fan failure Others EEV defect h IPM (Intelligent Power Module) : The part to control the inverter compressor - 120 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 121 If it is measured in power supply stand by state, check the tester’s measurement mode and be careful of the short circuit with parts other than the measurement part. - 121 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 122 EEV connector falling off / EEV assembly defect h IPM (Intelligent Power Module) : The part to control the inverter compressor - 122 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 123 If it is measured in power supply stand by state, check the tester’s measurement mode and be careful of the short circuit with parts other than the measurement part. - 123 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 124 (Based on 25 ℃ of surrounding temperature) 3. Sensor insulation resistance : The resistance between the sash and sensor terminal should be not less than 1MΩ. - 124 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 125 - Position : Rear part of outdoor device Outdoor temperature sensor - Sensor value : 10 kΩ ± 10 % (Based on 25 ℃) Ω - 125 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 126 Voltage of 5V is output PCB checking and replacement from the PCB? No malfunction of the pressure Replace the pressure sensor sensor - 126 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 127 Chassis Panel power source wire coating ※ It should not be short Replacement of LED Off inverter PCB Replacement of main PCB - 127 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 128 : Interference with wires or wire coating damage with chopping Inverter PCB LED : Replacement of inverter PCB during LED Off after resetting - 128 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 129 Replacing Communication Communication indoor Grounding cable length cable length If length is 50 m over, Please separate communication wire - 129 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 130 Check fuse state Check whether outdoor PCB LED is lighted. Division Fuse Point 2 kW 3 kW 4.5 kW 6 kW 7 kW - 130 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 131 Neutral Wire-to-Wire Wire tongue-termination fault. Communication noise by oxidized wire arrangement : Soldering is required. Neutral - 131 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 132 Line and Neutral Line and Live ∞ ∞ Ω Ω - 132 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 133 Live and Pipe Pipe Neutral and Pipe Pipe ∞ ∞ Ω Ω Check Resistance Check Resistance Communication Line and Pipe Pipe ∞ Ω - 133 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 134 6.7 Troubleshooting Outdoor Error CH 05/53 (Indoor/Outdoor Device Communication Error) → Detection by indoor devices Check LGMV Communication rate Communication rate (Normally 90 % - 134 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 135 -. It helps outdoor unit communicate with indoor unit better than before and reduce the noise level [Connector with capacitor in CN_Flash_Writer or CN_Flash] Connector with capacitor in CN_FLASH and CN_CNVSS - 135 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 136 Installation Checking N-phase phase loss Checking for open and reverse phase Fuse damage AC load (R and S phases) Inverter PCB - 136 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 137 Set the tester in AC voltage measurement mode (The part having wave pattern) N-phase 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 - 137 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 138 - Operation with replacement of R and S phases only Brown B Black Green Brown B Black Green Brown B Black Green Green - 138 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 139 (Shape of marking line and direction of EEPROM) Check whether EEPROM is perfectly adhered. Check whether EEPROM lead is put out of the outlet. - 139 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 140 Division EEPROM Position 4 kW EEPROM [Inverter PCBA] [EEPROM PCBA] 4.5 kW 6 kW Inv. 6/7 kW Main 7 kW Inv. - 140 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 141 Checking EEV for Pipe Checking fan Cycle proper working blocking for working Properties Sensor of unit Replacing - 141 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 142 Checking for proper working Restoration of Checking for proper working temperature ❈ Heat sink Error Temperature standard: 95 ℃ Replacing PCB - 142 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 143 Heatsink High NG Temperature level Controller Temperature level 4 kW 95 °C 4.5 kW 95 °C 6 kW 85 °C 7 kW 125 °C - 143 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 144 3. Measure the resistance Heat sink Temp point (Refer to the next page) (based on 25 ℃, 10 kΩ ± 10 %) - 144 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 145 Part 4 Trouble Shooting Division Heat sink Tempe Sensor Point 6 kW - 145 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 146 2) Both the fan and PCB may be damaged when the fan connector is inserted in reverse direction.. 3) If fan motor fault is identified, PCB should be also replaced in consideration of possible damage of PCB. - 146 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 147 Normal resistance (±10 %) ∞ ∞ Dozens kΩ Dozens kΩ ~hundreds kΩ ~hundreds kΩ ∞ ∞ Dozens kΩ Dozens kΩ ~hundreds kΩ ~hundreds kΩ - 147 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 148 0.35 V~0.55 V 0.35 V~0.55 V 0.35 V~0.55 V 0.35 V~0.55 V 0.35 V~0.55 V 0.35 V~0.55 V 0.35 V~0.55 V - 148 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 149 Judge Fan IPM Pins for short. ■ Fan IPM Check Point Division Fan IPM Check Point 4.5 kW 26 24 FAN_IPM - 149 - Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 150 P/NO : MFL71683601 Copyright © 2019 - 2020 LG Electronics Inc. All rights reserved. Only training and service purposes.

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