LG ZHBW041GA0 Service Manual
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LG ZHBW041GA0 Service Manual

LG ZHBW041GA0 Service Manual

Air-to-water heat pump
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AIR-TO-WATER HEAT PUMP
SERVICE MANUAL
(General)
CAUTION
Before Servicing the unit, read the safety precautions in General SVC manual.
Only for authorized service personnel.
Due to our policy of continuous product innovation, some specifications may change without notification.
© LG Electronics U.S.A. Inc., Englewood Cliffs, NJ. All rights reserved. ''LG'' is a registered trademark of LG Corp.

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  • Page 1 Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel. Due to our policy of continuous product innovation, some specifications may change without notification. © LG Electronics U.S.A. Inc., Englewood Cliffs, NJ. All rights reserved. ''LG'' is a registered trademark of LG Corp.

  • Page 2: Table Of Contents

    1. Checking Key Components of Indoor Unit 2. Checking Key Components of Outdoor Unit 3. Self-Diagnosis Feature 4. Trouble Shooting Guide - 2 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 3: Safety Precaution

    When repairing the equipment in a humid or wet place, you must ground the unit in accordance with local, state, and NEC codes to avoid electrical shocks. - 3 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 4 • Product is all-in-one and require no additional refrigerant charge. If you need to recharge the refrigerant, please contact a licensed professional. - 4 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 5 Have a dry powder or CO2 fire extinguisher adjacent to the charging area. - 5 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 6 This shall be reported to the owner of the equipment so all parties are advised. - 6 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 7 A halide torch (or any other detector using a naked flame) shall not be used. - 7 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 8 Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that ventilation is available. - 8 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 9 The label shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant. - 9 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 10 A vacu- um valve shall be provided to evacuate the interconnecting pipe and/or any uncharged refrigerating system part. - 10 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 11 - 11 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 12 Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Servicing shall be performed only as recommended by the manufacturer. - 12 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 13 Precautions shall be taken to avoid excessive vibration or pulsation to refrigerating piping. - 13 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 14 • Piping in refrigerating systems shall be so designed and installed to minimize the likelihood hydraulic shock damaging the system. - 14 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 15 2.1 Indoor Unit .............12 2.2 Outdoor Unit ............13 3. Combination of Outdoor Units ........14 4. Nomenclature..............15 4.1 Indoor Unit .............15 4.2 Outdoor Unit ............15 - 15 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 16: Model Information

    - E.g) 55 kBtu/h → '55' Electrical ratings - G : 220~240/50,60/1 Function - A : General heating heat pump Series Number - 16 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 17 - Minimum operating temperature of water : Heating 15 °C (59 ℉) / Cooling 5 °C (41 ℉) - Maximum inlet water pressure : 0.3 MPa(43.5 PSI) - Minimum inlet water pressure : 0.03 MPa(4.4 PSI) - 17 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 18 (water temperature 23 °C (73.4 ℉) → 18 °C (64.4 ℉) at outdoor ambient temperature 35 °C (95 ℉) / 24 °C (75.2 ℉)) * All appliances were tested at atmospheric pressure. - 18 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 19: External Appearance

    Outdoor Unit UN60A Chassis Remote Controller Remote Controller Cable (Default length : 10m(3.3 ft) Damper (x 6) Drain Cap (x 6) - 19 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 20 UN60A (12(41 000), 14(48 000), 16(55 000) kW(Btu/h)) * The shape may differ depending on the model. Refer to “Exploded View” in SVC Manual. - 20 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 21 This PCB controls the cycle parts of the unit Main PCB assembly (B) This PCB controls the functioning of the unit - 21 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 22: Part 2 : Features & Controls

    Part 2 Features & Controls - 22 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 23: List Of Function

    Digital inputs for energy saving (SG Ready) Communication with LG ESS by Modbus Energy Monitoring DHW Recirculation Notes 1. O : Applied, X : Not applied - 23 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 24 1. O : Applied, X : Not applied 2. * : Some advanced functions controlled by individual controller cannot be operated. - 24 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 25 6. If you need more detail, please refer to the manual of product. (http://partner.lge.com > Select Your Region : Home> Doc.Library> Product > Control(BECON)) - 25 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 26: Feature & Controls

    When you change the menu’s setting value OK button When you save the menu’s setting value On/Off button When you turn ON/OFF the air conditioner - 26 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 27 In the lock setting list, if you press [∧,∨(up/down)] button, you can turn on/off the corresponding lock function. - 27 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 28 • After setting the value, when you press [OK] button, the timer is activated. • After setting the value, if you press [Back] button, the changed value will not be applied. - 28 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 29 If the product operation is Off, the easy timer turns on the operation after the corresponding time. If the easy timer operation is turned On/Off before the timer operation, the set timer will be cleared. - 29 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 30 Even if the Turn-on Reseravation operation is turned On/Off after the setting and before the timer operation, the set timer is not cleared. - 30 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 31 Even if the Turn-off Reservation operation is turned On/Off after the setting and before the timer operation, the set timer is not cleared. - 31 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 32 When stages 1~4 are completed, along with the message of ‘schedule is added’, it moves to View and edit schedule screen. - 32 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 33 • If necessary, enable or disable of screed drying can be programmed according to user’s setting. • While the screed drying mode is operating, “Dry” is displayed. - 33 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 34 • Whenever adjusting DIP switch, turn off electric power supply to avoid electric shock. General Information OFF is selected ON is selected - 34 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 35 Half capacity is used only heater capacity Full capacity is used Thermostat is NOT installed Thermostat installation information Thermostat is installed - 35 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 36 Bridge at CN_ANTI_SW must be dis-connected to enable setting. UN60A (12(41 000), 14(48 000), 16(55 000) kW(Btu/h)) OFF is selected ON is selected - 36 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 37 Peak Control Mode Running Current (A) Chassis Phase (Ø) Capacity (kW(Btu/h)) 1 Step 2 Step 12 (41 000) UN60A 14 (48 000) 16 (55 000) - 37 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 38 But in emergency operation, automatic re-start is prohibited to protect the unit. Therefore, user must restart the unit after power reset when emergency operation has been running. - 38 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 39 RMC Version Information Check the remote controller model name and software version. Open Source License View the remote controller’s open source license. - 39 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 40 • While “edit” button is selected, press [OK] button to move to the edit screen, change it, and press [OK] button to change the service contact point. - 40 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 41 Btu, There may be a small difference between calculated and actual capacity. Ex) If the indoor unit capacity is 18kBtu, it is displayed as 5kWh. - 41 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 42 • In the service setting list, select the RMC version information and press [OK] button to move to the detail screen - 42 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 43 • In the service setting list, select the open source license category, and press [OK] button to move to the detail screen. - 43 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 44 Input the password and press [OK] button to move to the installer setting list. - 44 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 45 This function controls floor heating to a specific temperature for a Screed drying certain period of time to cure floor cement - 45 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 46 This function is to apply an offset to the freezing temperature of the Frost Protection Temp. freeze protection logic when using antifreeze mode - 46 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 47 Info Current Flow Rate Function to check the current flow rate. Data logging Display error and operation history of connected unit - 47 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 48 • Remote room air sensor is an accessory (PQRSTA0) and sold separately. • DIP switch setting should be set properly in order to control the unit based on room air temperature. - 48 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 49 • If DHW heating is disable, the Over-heating mode will not be operated although Over-heating active is set as ‘Use’. • To use Over-heating mode, DHW heating should be enable. (by button input or scheduler programming) - 49 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 50 Session C : No heating (Booster heater is Off) Session D : Heating by booster heater DHW heating does not operate when it is disabled. - 50 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 51 It is a function to adjust the cooling water temperature Thermal On / Off temperature according to the field environment in order to offer optimized heating operation. - 51 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 52 When you press “initialization” button, a popup screen appears, and when you press “check” button, password initialization starts, and the user password is changed to 0000. - 52 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 53 The booster heater is activated after the booster heater delay time(20 min) 8:50 The user deactivates the DHW function by turning it off in the remote controller - 53 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 54 Pump Prerun operates to ensure sufficient flow before the compressor is operated. This is a function that allows heat exchange to work smoothly. - 54 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 55: Test Run

    * Check for abnormal sound in difference between intake and outdoor unit (comp.,Fan, others ) discharged water? * Refer to Troubleshooting Guide Normal - 55 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 56: How To Drain Remaining Water In The Product

    - To use the product again, you have to refill water in it. Refer to ‘Water Charging’ of ‘Installaion’ part in installation manual. - 56 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 57: Part 3 Basic Control

    Part 3 Basic Control - 57 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 58 = T condenser + α T condenser : condenser temperature (℃ (℉)) Tevaporator : evaporation temperature (℃ (℉)) - 58 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 59: Part 4 Replacement

    Part 4 Replacement - 59 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 60: Replacement Procedure For Compressor

    10. Conduct vacuum. 11. After completion of vacuum, open the service valves. If recovery unit is used, charge refrigerant. ④ - 60 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 61: Caution For Assembling Outdoor Panels After Test Run

    If screws are not assembled, it allows rain come into control box causing malfunction of unit. - 61 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 62: Part 5 : Trouble Shooting

    Part 5 Trouble Shooting - 62 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 63 2. Self-Diagnosis Feature..............70 2.1 Concept of ‘Classified Trouble’ ...............70 2.2 Error Indicator...................71 2.3 Error Code List..................72 3. Trouble shooting Guide ................74 - 63 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 64: Checking Key Components Of Indoor Unit

    • Check the air vent. If there is air in the unit, it can display “CH14”. Please remove the air by using the air vent. - 64 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 65: Water Pump

    In this case, contact official After Service Center and replace the unit PCB. • To correct wrong wiring, please refer Ⓐ. - 65 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 66: Back Up Heater

    If the reason of malfunction is clearly proved as the faulty back up heater itself, then replace it with new one. - 66 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 67: Remote Controller

    Unless 2nd and 3rd pin of DIP switch setting is OFF-ON or ON-OFF, the water tank heating will not be configured. - 67 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 68: Compressor

    (when measuring absolute values). Accurate measuring values cannot be obtained with a general portaable tester (For analog and digital mode). - 68 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 69: Fan Motor

    3. If problems continue to occur even after coun- termeasure of No.1 and No.2, it means that both boards have malfunction. - 69 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 70: Self-Diagnosis Feature

    - But in emergency operation, automatic re-start is prohibited to protect the product. - Therefore, user must restart the product after power reset when emergency operation has been running. - 70 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 71: Error Indicator

    Inverter compressor IPM defect 2times ◑ 1time ◑ Outdoor PCB Chassis Indoor Main PCB (Hydro) Phase(Ø) Inverter PCB Main PCB (Cycle) UN60A - 71 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 72: Error Code List

    Before conducting a checking or repairing job, pull out the plug out of the outlet and make sure that the lamp on the control board outdoor unit is off. - 72 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 73 Vapor injection inlet pipe temperature sensor of outdoor unit is open or short. 115** Injection Out TH Error (Open/Short) Vapor injection outlet pipe temperature sensor of outdoor unit is open or short. - 73 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.

  • Page 74: Trouble Shooting Guide

    Is the sensor resistance or the voltage across the sensor • Replace the sensor coupling normal? Replace the Main PCB(Indoor) - 74 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 75 ± 5 %. * There may be some errors depending on the measurement equipment. - 75 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 76 1.4 k 0.9 V Ω 60 ℃ (140 ℉) 1.2 k 0.8 V Ω 65 ℃ (149 ℉) 0.7 V Ω - 76 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 77 • Replace the sensor damaged? Is the voltage of the sensor • Replace the sensor connector normal? Replace the Main PCB(Indoor) - 77 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 78 65.0 (942.7) 2.90 2.8 (40.6) 0.92 70.0 (1 015.2) 3.10 3.0 (43.5) 0.95 75.0 (1 087.8) 3.30 80.0 (1 160.3) 3.50 - 78 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 79 Is the DC12V supply voltage of the wired remote controller Inspect Main PCB and replace measured normally? Inspect Wired remote controller and replace - 79 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 80 3. Disconnect the "CN-REMO" connector of the wired remote control. 4. Set the range of the tester to Ω. 5. Please check as below. - 80 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 81 - CH05: Check the Main PCB(Outdoor Cycle) and check the Main PCB(Indoor) - CH53: Check the Main PCB(Indoor) and then check the Main PCB(Outdoor Cycle) - 81 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 82 ▶12(41 000), 14(48 000), 16(55 000) kW(Btu/h) : Check the connection state of the PCB connection harness CN_POWER SINGLE SINGLE SINGLE Main PCB(Outdoor Cycle) Main PCB(Indoor) - 82 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 83 Check PCB Pump Signal Check PCB Output Voltage Check the voltage of the flow Check and Change the sensor connector flow sensor - 83 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 84 2. If the EEPROM value & the Program value are not matched, the Code is Displayed 3. After Checking the connection and Insertion, replace the PCB or Option PCB EEPROM - 84 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 85 *. When you open the air vent inside the pump, be sure to close it. - If there is no problem, check whether the flow rate is low. - 85 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 86 1) External strainer cleaning method Close the Shut-off valve(9) at the front and rear of the strainer. ❈ Strainer may not be the corresponding type. - 86 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 87 Remove the strainer fixing clip at the bottom as shown in the picture. Pull the strainer to separate it and wash it. Open the Shut-Off valve after separation and tightening in reverse order. - 87 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 88 * Even if you temporarily clean the PHEX, please clean it as there are many foreign substances attached to the PHEX. - 88 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 89 2) If the PCB connector is missing or less inserted Reinsert the connector. CN_FLOW1 CN_W_PUMP_A CN_MOTOR1 * Please proceed by referring to the inspection guide in the next chapter. - 89 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 90 ⑤ After the breaker is turned off, refasten CN_MOTOR1 and check the ② and ③ processes again. - If CH14 occurs, check the flow sensor. - 90 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 91 - Check the external pump power connection and power output status. (If the external pump is abnormal, contact the installation shop.) - 91 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 92 - Contact is open: No Sound (PCB NG) → PCB inspection required - Contact is closed: Sound is heard (PCB OK) → Pump needs to be checked - 92 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 93 10 °C (50 °F) = 10 kΩ : 25 °C (77 °F) = 5 kΩ : 50 °C (122 °F) = 1.8kΩ Measure Indoor unit outlet piping temperature sensor Inlet pipe resistance Temp. sensor - 93 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 94 Water out Water in Back up Heater Out Voltage (at 25 ℃(77℉)) Water Out 2.232 Water In 2.232 CN_TH3 CN_TH3 CN_TH3 - 94 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 95 55 °C (131 °F) 1.4 kΩ 0.9 V 60 °C (140 °F) 1.2 kΩ 0.8 V 65 °C (149 °F) 0.7 V 1 kΩ - 95 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 96 - 1Ø Model : Manually reset by pressing the button on the thermo switch. Water out Water in Back up Heater Out CN_TH3 CN_TH3 CN_TH3 - 96 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 97 When measuring at standby state of power supply, after checking the measurement mode of the meter, be careful of the short-circuits with other parts. - 97 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 98 4. Turn on Power 5. Remote Controller Off (Stop mode) 6. Connect LGMV 7. Wait 30seconds. 8. Check compressor and fan off - 98 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 99 9. Perform diagnostic function PC LGMV Mobile LGMV - 99 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 100 · Connector reconnection: replacement when malfunction in good condition? Is IGBTM normal? · Inv PCB(Outdoor) replacement Recheck power and installation condition - 100 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 101 0.438 Ω (at 25 °C (77 ℉)) 1Ø (41 000, 48 000, 55 000 Btu/h) 0.438 Ω (at 25 °C (77 ℉)) - 101 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 102 - 1Ø: Check if the L-N input voltage is within AC 230V ± 15 % Is the input voltage normal? Is the Inv PCB(Outdoor) normal? · Inv PCB(Outdoor) IPM check - 102 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 103 Normal 15 V : 15 V ± 10% V Normal 5 V : 5 V ± 10% V Inv. Inv. Inv. 15 V - 103 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 104 Is the DC link voltage detector DClink voltage detection part parts normal? burnout, work malfunction check * Action: Replace Inv PCB (Outdoor) - 104 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 105 2. Check the outdoor unit input voltage L-N: 230 ± 15 % V / L-G, N-G: 0 V or 230 V 230 ± 15 %V - 105 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 106 4. U ~ GND / V ~ GND / W ~ GND measurement 5. If the IPM measurement value is significantly different from the normal value, IPM abnormal judgment - 106 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 107 Replace High pressure sensort manifold? [Note 2] Check whether the pressure Take action after confirming switch connector is short blockage of piping - 107 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 108 Check Inverter PCB assembly PFC Part. Is Outdoor PCB PSC/PFC → Replace PCB assembly if abnormality Module normal? found. Recheck power and installation condition - 108 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 109 (Check R-N, S-N, T-N voltage during product operation) 2. Check if another product with a large load is connected to the same power supply. Input Voltage - 109 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 110 4. U ~ GND / V ~ GND / W ~ GND measurement 5. If the IPM measurement value is significantly different from the normal value, IPM abnormal judgment - 110 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 111 • Check the sensor assembly status • Check if the sensor is burned: Measure resistance → 200 KΩ ± 10 % (25 ℃ (77 ℉) basis) - 111 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 112 Do not replace PCB before EEV inspection. If an EEV is found, check the normal operation of the product after replacing the EEV. - 112 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 113 10 kΩ 362 kΩ 25 ℃(77 ℉) 10 kΩ 5 kΩ 200 kΩ 50 ℃(122 ℉) 3.4 kΩ 1.8 kΩ 82 kΩ - 113 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 114 Connect sensor to PCB correctly PCB(Outdoor Cycle) correctly? After replacement of outdoor unit Main PCB(Outdoor Cycle) is the system also abnormal? Replace corresponding pressure sensor - 114 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 115 Main PCB EEPROM voltage measurement method How to check communication LED Yellow LED [Main PCB(Outdoor Cycle)] Yellow LED [Main PCB(Outdoor Cycle)] [Inv PCB(Outdoor)] - 115 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 116 PCB(Outdoor Cycle) (7-segment) Note: Turn off the power and replace the EEPROM. Inverter CH60 is displayed only on Inv CH60 PCB(Outdoor) (blinking LED) - 116 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 117 • Check if the sensor is burned: Measure resistance → 200KΩ±10% (25 ℃ (77 ℉) basis) Recheck power and installation condition - 117 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 118 Recheck Power and installation condition Check Point - Check connection condition of IPM/IGBTM and Heatsink Screw Hole (under the sticker) IGBTM IGBTM - 118 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 119 (However, if the PCB is not replaced, the motor is malfunction, thus replace the motor and restore the PCB.) Recheck power and installation environment - 119 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 120 V-W [Ω] (kW(Btu/h) EAU62543703 12, 14, 16 43.1±5% (41 000, 48 000, 55 000) 43.1±5% EAU62543704 * 25 ℃ (77 ℉) standard - 120 - Copyright © 2023 - 2024 LG Electronics Inc. All rights reserved. Only training and service purposes.
  • Page 121 P/NO : MFL68026805 Copyright © 2023 LG Electronics Inc. All rights reserved. Only training and service purposes.

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