LG Therma V ZHBW056A0 Service Manual

Air-to-water heat pump

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CONFIDENTIAL

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.

Table of Contents

Troubleshooting

Summary of Contents for LG Therma V ZHBW056A0

Page 1 CONFIDENTIAL 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. Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 2 Part 5 : Trouble Shooting 1. Checking Key Components of Indoor Unit 2. Checking Key Components of Outdoor Unit 3. Self-Diagnosis Feature 4. Trouble Shooting Guide - 2 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 3 Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shocks. - 3 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 4 • When flared joints are reused indoors, the flare part shall be re-fabricated. • When mechanical connectors are reused indoors, sealing parts shall be renewed. - 4 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 7 Under no circumstances shall potential sources of ignition be used in the searching for or detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall not be used. - 7 - Copyright © 2018 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 ignition sources and there is ventilation available. - 8 - Copyright © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 10 A vacuum valve shall be provided to evacuate the interconnecting pipe and/or any uncharged refrigerating system part. - 10 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 11 The noe hose-sets supplied with the appliance are to be used and that old hose- sets should not be reused. - 11 - Copyright © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 13 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 - 13 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 14 - Additional Information : serial number is refer to the barcode on the product. - Max allowable pressure High side / Low side : 4.32 MPa / 2.4 MPa - Refrigerant : R32 - 14 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 15 (water temperature 23°C → 18°C at outdoor ambient temperature 35°C / 24°C) **3 : All appliances were tested at atmospheric pressure. ZHBW056A0 ZHBW126A0 ZHBW128A0 ZHBW076A0 ZHBW146A0 ZHBW148A0 ZHBW096A0 ZHBW166A0 ZHBW168A0 - 15 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 16 3. The specification may be subject to change without prior notice for purpose of improvement. 4. ** Indoor unit Rated water flow rate. - 16 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 17 3. The specification may be subject to change without prior notice for purpose of improvement. 4. ** Indoor unit Rated water flow rate. - 17 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 18 3. The specification may be subject to change without prior notice for purpose of improvement. 4. ** Indoor unit Rated water flow rate. - 18 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 19 5kW, 7kW, 9kW) Outdoor Unit UN3 Chassis (Product heating capacity : 12kW, 14kW, 16kW) Remote Controller Remote Controller Cable Drain Cap Drain Nipple - 19 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 20 Main PCB assembly(A) This PCB controls the cycle parts of the unit Main PCB assembly(B) This PCB controls the functioning of the unit - 20 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 21 Main PCB assembly(A) This PCB controls the cycle parts of the unit Main PCB assembly(B) This PCB controls the functioning of the unit - 21 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 22 Main PCB assembly(A) This PCB controls the cycle parts of the unit Main PCB assembly(B) This PCB controls the functioning of the unit - 22 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 24 1. O : Applied, X : Not applied Accessory model name : Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package. - 24 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 25 3. ** : It could not be operated some functions. 4. If you need more detail, please refer to the BECON PDB or the manual of product. (http://partner.lge.com/global : Home> Download> Manuals) - 25 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 26 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 © 2018 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 func- tion. - 27 - Copyright © 2018 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 © 2018 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 © 2018 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 © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 32 - If ‘Stop’ is selected, you cannot set the mode / temperature / fan speed. When stages 1~4 are completed, along with the message of ‘schedule is added’, it moves to View and edit schedule screen. - 32 - Copyright © 2018 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 © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 34 Turn off electric power supply before setting DIP switch • Whenever adjusting DIP switch, turn off electric power supply to avoid electric shock. General Information OFF is selected ON is selected - 34 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 35 Electric heater is not used Unused Electric heater step Half capacity is used. Full capacity is used. Thermostat is NOT installed Thermostat installation information Thermostat is installed - 35 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 36 Remote sensor is not installed Remote Air Sensor Remote sensor is installed Antifreeze mode not use MODBUS Function Antifreeze mode Reserved Reserved Reserved Not Use - 36 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 37 - Heavy trouble : Heating Operable only - Critical trouble : Service center request AWHP operates when user pressed OK button on pop-up window. - 37 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 38 Indoor / outdoor product group and capacity information RMC Version Information Check the remote controller model name and software version. Open Source License View the remote controller’s open source license. - 38 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 39 • 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. - 39 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 40 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. - 40 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 41 View the remote controller software version. • In the service setting list, select the RMC version information and press [OK] button to move to the detail screen - 41 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 42 Example) SW version : 1.00.1 a In the above case, the password is 1001. h Remote controler should be hanged botton of control box in service - 42 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 44 Heating air temperature TH On / Off Type setting setting TH on/off Variable, heating Water Heating Water Outlet Temperature TH On / Off Type setting - 44 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 45 Display error history of connected unit It is the function to initialize (0000) the password when you forgot the password Password Initialization setting set in the remote controller. - 45 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 46 Remote air sensor connection is set as 02. • Dry Contact Mode This function allows the dry contact operate under auto run mode or manual mode with remote controller. - 46 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 47 • DIP switch No. 2 and 3 should be set properly. • Screed drying mode After installing water pipes for under floor heating, user can select screed drying mode for curing the cement. - 47 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 48 • If DHW heating is disable, the disinfection mode will not be operated although Disinfection active is set as ‘Use’. • To use disinfection mode, DHW heating should be enable. (by button input or scheduler programming) - 48 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 49 Session C : No heating (Water heater is Off) Session D : Heating by water heater DHW heating does not operate when it is disabled. - 49 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 50 It is a function to adjust the cooling water temperature Thermal On / Off temperature according to the field envi- ronment in preparation for cooling or cooling claim. - 50 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 51 - In this mode, setting temperature will follow outdoor temperature automatically. This mode adds the cooling sea- son function to the conventional weather dependent operation mode. - 51 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 52 Time ❈ 1=active / 0=not active ❈ A = Active time ❈ S = Stop time ❈ B = Boost heater delay time - 52 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 53 Pump Prerun operates to ensure sufficient flow before the compressor is operated. This is a function that allows heat exchange to work smoothly. - 53 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 54 (comp.,Fan, others ) discharged water? * Refer to Troubleshooting Guide Operation mode change to Heating mode Is hot water discharged ? Normal - 54 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 56 Tevaporator : evaporation temperature (℃) ＊Heating mode the target temperature of discharge pipe = T condenser + α T condenser : condenser temperature (℃) - 56 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 58 If recovery unit is used, charge refrigerant. When inserting the sound proof, be sure to insert counter-clockwise. < Figure 2 > Discharge pipe Suction pipe - 58 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 59 Be sure that PCB assembly is firmly assembled with control case. Confirm that there is no gap between PCB case and control case. If any gap is present, it will cause product malfunction. - 59 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 62 1.6 Fan Motor ....................67 2. Self-Diagnosis Feature..............68 2.1 Concept of ‘Classified Trouble’ ...............68 2.2 Error Indicator...................69 2.3 Error Code List..................70 3. Trouble shooting Guide ................72 - 62 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 63 • Check the air vent. If there is air in the unit, it can display “CH14”. Please remove the air by using the air vent. - 63 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 64 220-240 V~ while ‘Water Pump Operating’ is displayed at control panel, the unit PCB is in trouble. In this case, contact official After Service Center and replace the unit PCB. • To correct wrong wiring, please refer Ⓐ. - 64 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 65 If the reason of malfunction is clearly proved as the defect of the electric heater itself, then replace it with new one. - 65 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 66 Unless 2nd and 3rd pin of DIP switch setting is 01(OFF-ON) or 10(ON-OFF), the water tank heating will not be configured. - 66 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 67 ) if using commercial frequency tester when measuring output values of the inverter (when measuring absolute values). Accurate measuring values cannot be obtained with a general portaable tester (For analog and digital mode). - 67 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 68 If starting is done, it means that the main board has defect. 3. If problems continue to occur even after countermeasure of No.1 and No.2, it means that both boards has defect. - 68 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 69 - 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. - 69 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 70 If abnormal voltage is supplied, the protection circuits will turn off the product in order to prevent the component damage. The product will automatically restart after 3 minutes. - 70 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 71 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. - 71 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 72 Injection In TH Error (Open/Short) Injection In sensor disconnection or shot circuit 115** Injection Out TH Error (Open/Short) Injection Out sensor disconnection or shot circuit - 72 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 73 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ’ Repair or Change the PCB(Heater). - 73 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 74 3. Check the volt. Of Main PCB(Heater) power source. (DC 12 V) ’ Repair or Change the Main PCB(Heater). 4. Check the installation of wired remote controller. (Noise interference) ’ Adjust the state of installation - 74 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 75 Re-connect transmission cable terminal block of main PCB(Heater) and main PCB(Inverter) main PCB(Inverter) fault Replace after checking main PCB(Heater) fault Replace after checking - 75 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 76 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ’ Repair or Change the PCB. - 76 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 77 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 - 77 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 78 • Check the air vent. If there is air in the unit, it can display “CH14”. Please remove the air by using the air vent. - 78 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 79 • Room air is not fully heated by under floor heating. • Wait while room air is heated by target Leaving water temperature of thermostat. temperature is higher than 57 °C - 79 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 80 Error diagnosis and countermeasure flow chart - Refer to error code 17/18/19 Trouble shooting Guide. - 80 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 81 7. If the voltage of the sensor is 2.5Vdc at 25°C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ’ Repair or Change the PCB. - 81 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 82 • Room air is not fully heated by under floor than 80 °C heating. • Wait while room air is heated by target temperature of thermostat. - 82 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 83 Recheck power and installation condition ZHBW166A0 0.864 Ohms Terminal Insulation Resistance n Comp checking method U-panel ≥ 10MΩ V-panel ≥ 10MΩ W-panel ≥ 10MΩ Copper pipe Comp - 83 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 84 0.628(at 25˚C) ZHBW096A0 0.628(at 25˚C) 0.438(at 25˚C) ZHBW126A0 ZHBW146A0 0.438(at 25˚C) ZHBW166A0 0.438(at 25˚C) 0.845Ω(at 25˚C) ZHBW128A0 ZHBW148A0 0.845Ω(at 25˚C) ZHBW168A0 0.845Ω(at 25˚C) - 84 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 87 → Check connection condition and wiring if power is abnormal Check PCB Assembly 1 IPM normality PCB Assembly 1 → Replace inverter PCB assembly normal? Recheck power and installation condition - 87 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 88 ZHBW128A0 / ZHBW148A0 / ZHBW168A0 - Check input_current of the CT sensor : DC 2.5±0.2V) ▶ZHBW056A0 / ZHBW076A0 / ZHBW096A0 Black <CT Sensing Check Point> ▶ ZHBW126A0 / ZHBW146A0 / ZHBW166A0 - 88 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 89 INPUT_CURRENT ▶ZHBW128A0 / ZHBW148A0 / ZHBW168A0 INPUT_CURRENT <Inverter PCB> <CT Sensing Check Point > - 89 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 90 Check power input voltage PCB assembly 1 Check power connection state Power connection normal? Replace PCB assembly 1 Is PCB(Inverter) Normal? Recheck power and installation condition - 90 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 91 4. Check DC Link Sensing Signal(ZHBW**6A0) :2.4~2.8V (Refer the Picture) 5. Check DC Link Sensing Signal(ZHBW**8A0) :0.4~0.6V (Refer the Picture) * ZHBW056A0 / ZHBW076A0 / ZHBW096A0 Black <CT Sensing Check Point> - 91 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 93 → Reassemble if abnormality found Check inverter PCB assembly IPM normality Is inverter PCB assembly normal? → Replace inverter PCB assembly Recheck power and installation condition - 93 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 95 3. If the measurements are outside DC 2.5V ± 0.2V, the parts are decided as burned. Black <CT Sensing Check Point> 3. Connector Check <WVC connector check> - 95 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 96 → Check connection condition and wiring if power is abnormal Check PCB assembly 1 IPM normality Is PCB assembly 1 → Replace inverter PCB assembly normal? Recheck power and installation condition - 96 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 98 : Normal Value of the resistor is 5kΩ at 25℃ Condenser Out-pipe sensor : Normal Value of the resistor is 5kΩ at 25℃ - 98 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 99 Connect sensor to PCB correctly to PCB(Inverter) correctly? After replacement of outdoor unit main PCB(Inverter) is the system also abnormal? Replace corresponding pressure sensor - 99 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 100 ※ It should not be short Replacement of LED Off inverter PCB ※ Refer to 3.15.1 Replacement of main PCB - 100 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 101 : Interference with wires or wire coating damage with chopping Inverter PCB LED : Replacement of inverter PCB during LED Off after resetting - 101 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 102 5. Make sure you have connected to the communication line soldering (If you do not connect by soldering, a communication error(CH05/CH53) occurs by noise) - 102 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 103 ※ Refer to 3.17.2 Checking for open and reverse phase ※ Refer to 3.17.3 Fuse damage AC load (R and S phases) Inverter PCB - 103 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 104 - Operation with replacement of R and S phases only Br own B Black Green Br own B Black Green Br own B Black Green Br own Black Green - 104 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 105 MAIN PCB assembly 1 normal? Recheck power and installation condition Check Point - Check the EEPROM Check sum & Direction ▶ZHBW056A0 / ZHBW076A0 / ZHBW096A0 - 105 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 108 1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module 2. Resistance value should be in 7kΩ ±10%.(at 25°C). <Check the PFCM> - 108 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 109 3. Do not replacing all of fan motor and 220-240 V~ at once. Check error code again, after replacing the abnormal part (Fan Motor or PCB) first. - 109 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 110 Check voltage betwen 1pin and 4pin of fan motor Fan motor connector Tester ▶ZHBW126A0 / ZHBW146A0 / ZHBW166A0 ▶ZHBW128A0 / ZHBW148A0 / ZHBW168A0 - 110 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.
Page 111 PFCM module No.4,5 pins are internal short state. placed below PFC Module ③ Replace PCB assembly 1 if it is short between pins except No.4,5 pins. - 111 - Copyright © 2018 LG Electronics Inc. All rights reserved. Only training and service purposes.

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