LG Therma V ZHBW056A0 Service Manual Download Page 98

Page: 98 / 115

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Display

code

Title

Cause of error

Check point & Normal condition

D-pipe sensor (Inverter)

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Air sensor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Condenser Mid pipe sen-
sor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Suction Pipe sensor

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Const-D-Pipe Sensor Error

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

114

Injection In Sensor Error

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

115

Injection Out Sensor Error

• Open / Short
• Soldered poorly
• Internal circuit error

1. Bad connection of thermistor connector
2. Defect of thermistor connector (Open/Short)
3. Defect of outdoor PCB(Inverter)

Check Point

1. Estimate the resistance of each sensor.(Unplugged)

2. Check the value of the resistor of thermistor.

D-pipe sensor (Inverter)

: Normal Value of the resistor is 200kΩ at 25℃

Air sensor

: Normal Value of the resistor is 10kΩ at 25℃

Cond. Mid-pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Suction pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Condenser Out-pipe sensor

: Normal Value of the resistor is 5kΩ at 25℃

Is sensor connected to

PCB(Inverter) correctly?

Is sensor value correct?*

Connect sensor to PCB(Inverter)
correctly

Replace sensor

Replace corresponding
PCB(Inverter)

Yes

Error Diagnosis and Countermeasure Flow Chart

Summary of Contents for Therma V ZHBW056A0

Page 1: ...UAL General CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel CONFIDENTIAL Copyright 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 2: ...pearance Part 2 Features Controls 1 List of Function 2 Feature Controls 3 Test Run Part 3 Basic Control Part 4 Replacement 1 Replacement procedure for Compressor 2 Replacement Procedure for INV PCB 3 Caution for Assembling Outdoor Panels after Test Run Part 5 Trouble Shooting 1 Checking Key Components of Indoor Unit 2 Checking Key Components of Outdoor Unit 3 Self Diagnosis Feature 4 Trouble Shoot...

Page 3: ...RNING Be sure to disconnect all remote electric power supplies before servicing Internal components and circuit boards are at main potential when the equipment is connected to the power cables This voltage is extremely dangerous and may cause death or severe injury if come in contact with it Do not touch the discharging refrigerant gas during the repair work The refrigerant gas can cause frostbite...

Page 4: ... removed or opened Otherwise it may cause fire electric shock explosion or death The appliance shall be stored so as to prevent mechanical damage from occurring Any person who is involved with working on or breaking into a refrigerant circuit should hold a current valid certificate from an industry accredited assessment authority which authorises their competence to handle refrigerants safely in a...

Page 5: ...imise the risk of a flammable gas or vapour being present while the work is being performed General work area All maintenance staff and others working in the local area shall be instructed on the nature of work being carried out Work in confined spaces shall be avoided The area around the workspace shall be sectioned off Ensure that the conditions within the area have been made safe by control of ...

Page 6: ...the manufacturer s maintenance and service guidelines shall be followed If in doubt consult the manufacturer s technical department for assistance The following checks shall be applied to installations using flammable refrigerants The actual refrigerant charge is in accordance with the room size within which the refrigerant containing parts are installed The ventilation machinery and outlets are o...

Page 7: ...ed such that they no longer serve the purpose of preventing the ingress of flammable atmospheres Replacement parts shall be in accordance with the manufacturer s specifications NOTE The use of silicon sealant can inhibit the effectiveness of some types of leak detection equipment Intrinsically safe components do not have to be isolated prior to working on them Repair to intrinsically safe componen...

Page 8: ...stem remote from the leak Oxygen free nitrogen OFN shall then be purged through the system both before and during the brazing process Removal and evacuation When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be used However it is important that best practice is followed since flammability is a consideration The following procedure shal...

Page 9: ...ble before the task is commenced a Become familiar with the equipment and its operation b Isolate system electrically c Before attempting the procedure ensure that mechanical handling equipment is available if required for handling refrigerant cylinders all personal protective equipment is available and being used correctly the recovery process is supervised at all times by a competent person reco...

Page 10: ...ealed to prevent ignition in the event of a refrigerant release Consult manufacturer if in doubt The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery cylinder and the relevant Waste Transfer Note arranged Do not mix refrigerants in recovery units and especially not in cylinders If compressors or compressor oils are to be removed ensure that they have been...

Page 11: ...is smaller than 1 The minimum floor area m2 2 The maximum refrigerant charge amount 2 4 kg Do not use means to accelerate the defrosting process or to clean other than those recommended by the manufacturer Do not pierce or burn Be aware that refrigerants may not contain an odour Periodic more than once year cleaning of the dust or salt particles stuck on the heat exchangers by using water Dismantl...

Page 12: ...power outlet with other electrical appliances otherwise it can cause an electrical shock excessive heat generation or fire Do not insert hands or other objects through the air inlet or outlet while the product is operating There are sharp and moving parts that could cause personal injury Do not block the inlet or outlet of air flow It may cause product failure CAUTION Check to see if the parts are...

Page 13: ...11 1 2 Outdoor Unit 11 2 External Appearance 12 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 Copyright 2018 LG Electronics Inc All rights reserved Only training and service purposes ...

Page 14: ...ber is refer to the barcode on the product Max allowable pressure High side Low side 4 32 MPa 2 4 MPa Refrigerant R32 Model number nomenclature Factory Model Name 1 Model Information Function A General heating heat pump Product electric power rating 6 220 240 V 50 Hz 8 380 415 V 3N 50 Hz Serial Number Heating capacity kW Ex 16 16kW class Model Type W DC Inverter Heat Pump Classification Air to Wat...

Page 15: ...ter temperature 23 C 18 C at outdoor ambient temperature 35 C 24 C 3 All appliances were tested at atmospheric pressure Model Name Capacity Power Source Unit Heating kW 1 Cooling kW 2 ZHBW056A0 5 0 5 0 220 240 V 50 Hz ZHBW076A0 7 0 7 0 ZHBW096A0 9 0 9 0 ZHBW126A0 12 0 12 0 ZHBW146A0 14 0 14 0 ZHBW166A0 16 0 16 0 ZHBW128A0 12 0 12 0 380 415 V 3N 50 Hz ZHBW148A0 14 0 14 0 ZHBW168A0 16 0 16 0 ZHBW056...

Page 16: ... Supply Included Earth Number of wires Capacity Cooling LWT 18 C 7 C kW Heating LWT 35 C 55 C kW Power Input Cooling LWT 18 C 7 C kW Heating LWT 35 C 55 C kW EER Cooling LWT 18 C 7 C W W COP Heating LWT 35 C 55 C W W Operation Range Min Max Cooling C Outdoor Temperature Heating C Operation Range Min Max Cooling C Leaving Water Temperature Heating C Sound Power Level Heating dB A Dimensions Unit W ...

Page 17: ...Temperature Heating C 25 35 25 35 25 35 Operation Range Min Max Cooling C 5 30 5 30 5 30 Leaving Water Temperature Heating C 25 65 25 65 25 65 Sound Power Level Heating dB A 63 63 63 Dimensions Unit W H D mm 1239 1450 390 1239 1450 390 1239 1450 390 Packed Unit W H D mm 1364 x 1602 x 461 1364 x 1602 x 461 1364 x 1602 x 461 Weight Unit W H D kg 131 131 131 Packed Unit W H D kg 146 146 146 Compresso...

Page 18: ... Outdoor Temperature Heating C 25 35 25 35 25 35 Operation Range Min Max Cooling C 5 30 5 30 5 30 Leaving Water Temperature Heating C 25 65 25 65 25 65 Sound Power Level Heating dB A 63 63 63 Dimensions Unit W H D mm 1239 1450 390 1239 1450 390 1239 1450 390 Packed Unit W H D mm 1364 x 1602 x 461 1364 x 1602 x 461 1364 x 1602 x 461 Weight Unit W H D kg 135 135 135 Packed Unit W H D kg 150 150 150 ...

Page 19: ...ice purposes 2 External Apprearance Item Image Quantity Installation Manual 1 Outdoor Unit UN4 Chassis Product heating capacity 5kW 7kW 9kW 1 Outdoor Unit UN3 Chassis Product heating capacity 12kW 14kW 16kW 1 Remote Controller 1 Remote Controller Cable 1 Drain Cap 2 Drain Nipple 1 ...

Page 20: ...ticles inside circulating water 4 Control box PCB and terminal blocks 5 Plate heat exchanger Heat exchange between refrigerant and water 6 Water pump Circulating the water 7 Pressure gage Indicates circulating water pressure 8 Safety valve Open at water pressure 3 bar 9 Expansion vassel Protecting components from water pressure 10 Main PCB assembly A This PCB controls the cycle parts of the unit 1...

Page 21: ...side circulating water 4 Control box PCB and terminal blocks 5 Plate heat exchanger Heat exchange between refrigerant and water 6 Water pump Circulating the water 7 Pressure gage Indicates circulating water pressure 8 Safety valve Open at water pressure 3 bar 9 Expansion vassel Protecting components from water pressure 10 Main PCB assembly A This PCB controls the cycle parts of the unit 11 Main PC...

Page 22: ...side circulating water 4 Control box PCB and terminal blocks 5 Plate heat exchanger Heat exchange between refrigerant and water 6 Water pump Circulating the water 7 Pressure gage Indicates circulating water pressure 8 Safety valve Open at water pressure 3 bar 9 Expansion vassel Protecting components from water pressure 10 Main PCB assembly A This PCB controls the cycle parts of the unit 11 Main PC...

Page 24: ...O O Water pump on off Control O O O Flow switch control O O O Thermostat interface 230V AC O O O Thermostat interface 24V AC X X X DHW Domestic Hot Water Tank heater Install kit O Accessory O Accessory O Accessory Solar thermal kit interface with DHW Tank O Accessory O Accessory O Accessory PHEX anti freezing control O O O Water pump forced operation O O O Autosetting according to ambient temperat...

Page 25: ...not be operated 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 Category Product Remark ZHBW056A0 HM051M U43 ZHBW076A0 HM071M U43 ZHBW096A0 HM091M U43 ZHBW126A0 HM121M U33 ZHBW146A0 HM141M U33 ZHBW166A0 HM161M U33 ZHBW128A0 HM123M U33 ZHBW148A0 HM143M U33 ZHBW168A0 HM163M U3...

Page 26: ...eature Controls 2 Feature Controls 1 2 Remote controller Controller Configuration Operation display window Operation and Settings status display Back button When you move to the previous stage from the menu s setting stage Up down left right button 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 OK Ope...

Page 27: ... or other persons cannot use it without permission It is the function to limit the desired temperature range that can be set in the wired remote controller 2 Special Function 1 In the menu screen press left right button to select lock setting category and press OK button to move to the lock setting list screen 2 In the lock setting list if you press up down button you can turn on off the correspon...

Page 28: ... select the timer category and press OK button to move to the timer setting list screen In the timer setting list screen press up down button to select the timer to set and press OK button to move to the detail screen 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 ...

Page 29: ...turns off the operation after the corresponding time 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 Simple Timer You can easily set the timer in the range of 1 7 hours in the units of 1 hour ...

Page 30: ...rposes 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 Turn On Reservation The product is automatically turned On at the set timer time It provides 2 Time formats 12Hours AM PM or 24Hours reference ...

Page 31: ...poses 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 Turn Off Reservation The product is automatically turned Off at the set timer time It provides 2 Time formats 12Hours AM PM or 24Hours reference ...

Page 32: ...schedule list select the daily schedule status category and press OK button to move to the daily schedule sta tus detail screen You can use the remote controller s left right button to check other date s timer information You can edit the saved schedule s timer information Select the schedule to edit using up down button and press OK button to move to the edit screen Select the timer information a...

Page 33: ...ress OK button to move to the edit screen In the exception day edit screen you can check delete change the corresponding exception day s setting contents When you change the exception day information you need to save it after the change DHW Tank Heating DHW Tank Heater Operation This function is schedule programming about DHW tank heating and DHW tank heater operation Two schedule programming for ...

Page 34: ... system correctly If not configured correctly improper operation or degrade of performance can be expected 3 1 DIP Switch Setting Turn off electric power supply before setting DIP switch Whenever adjusting DIP switch turn off electric power supply to avoid electric shock General Information CAUTION OFF ON OFF is selected SW2 ON is selected 1 2 3 4 5 6 7 8 OFF ON SW1 1 2 3 4 OFF ON SW3 1 2 3 4 ...

Page 35: ... central controller is equipped 1 1 As Master As Slave Accessory installation information 2 3 6 7 2 3 6 7 2 3 6 7 2 3 6 7 Unit Outdoor unit is installed Unit Outdoor unit DHW tank is installed Unit Outdoor unit DHW tank Solar thermal system is installed DHW tank is installed Full capacity is used Cycle 4 4 Heating Only Heating Cooling Flow switch detection 5 Always 5 While water pump is on Electri...

Page 36: ...rved 4 Description Description Setting Setting Default Default Remote Air Sensor 1 1 Remote sensor is not installed Remote sensor is installed 2 2 Antifreeze mode not use Antifreeze mode Reserved MODBUS Function 3 3 Reserved 1 2 3 Not Use 4 4 Reserved 4 36 Copyright 2018 LG Electronics Inc All rights reserved Only training and service purposes Option Switch 1 Option Switch 3 ...

Page 37: ...is classified two levels according to the seriousness of the problem Slight Trouble and heavy trouble Slight trouble Sensor trouble Heavy trouble Compressor cycle trouble Option trouble a problem is found for option operation such as water tank heating In this trouble the trou bled option is assumed as if it is not installed at the system When the AWHP has any trouble 1 If there is not a function ...

Page 38: ...tic re start is prohibited to protect the unit Therefore user must restart the unit after power reset when emergency operation has been running 3 2 Service setting How to enter service setting To enter the menu displayed at the bottom you need to enter the service setting menu as follows In the menu screen press left right button to select the setting category and press OK button to move to the se...

Page 39: ... service center phone number that you can call when there is service issue In the service setting list select the service contact point and press OK button to move to the detail screen 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 OK OK ...

Page 40: ...the remote controller is connected In the service setting list select the indoor outdoor model information category and press OK button to move to the detail screen Indoor unit capacity 1kWh 1kBtu 0 29307 kWh is the result calculated based on 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 OK ...

Page 41: ... All rights reserved Only training and service purposes RMC Version lnformation 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 OK ...

Page 42: ... and any installation or change that is carried out by a non certifi cated person should be responsible for the results In this case free service cannot be provided h Installer setting password Main screen menu setting service RMC version information SW Version 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 CA...

Page 43: ... and service purposes 1 In the menu screen press left right button to select the setting category and press up button for 3 seconds to enter the password input screen for the installer setting 2 Input the password and press OK button to move to the installer setting list 3 ...

Page 44: ... heating mode DHW Set Temp setting Setting DHW set temperature Screed drying setting Setting for using Step 1 or 2 capacity of electric Heater on temperature Setting outdoor air temperature where half capacity of electric heater starts operation Water supply off temp during cooling setting Determine leaving water temperature when the unit is turned off This funtion is used for preventing condensat...

Page 45: ... product set the operation option value in SG1 step Seasonal auto temp setting Set the operating temperature in Seasonal Auto mode Modbus Address It is function to set the address of the Modbus device that is externally linked to the product Modbus address setting function is available from indoor unit CN_EXT Function to set external input and output control according to DI DO set by customer usin...

Page 46: ...mperature or leaving water temperature The selection for setting tem perature as air temperature or leaving water temperature is determined Note Air temperature as setting temperature is ONLY available when remote air sensor connection is enabled and 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 remot...

Page 47: ... below 18 C Water condensation on the radiator While cooling operation cold water may not flow to the radiator If cold water enters to the radiator dew gener ation on the surface of the radiator can be occurred Air heating set temp Determine heating setting temperature range when air temperature is selected as setting temperature Only available when remote air temperature sensor is connected Acces...

Page 48: ...ion of disinfection mode Vales of Tank disinfection setting If Disinfection active is set as Not use that is disable disinfection mode Start date and Start time is not used When Disinfection active is set as Use that is enable disinfection mode Start date is displayed at the posi tion of Disinfection active and Start time is displayed at the position of Start date DHW heating should be enable If D...

Page 49: ...ater will be turned off when the water temperature is above 73 C The water tank heater will be turned on when the water temperature is below 70 C Example If Heating priority is set as DHW that means heating priority is on DHW heating DHW is heated by AWHP compressor cycle and water heater In this case the under floor can not be heated while DHW heating On the other hand if the Heating priority is ...

Page 50: ...lid when FCU is installed FCU determines if FCU is installed or not Example If Stop temp is set as 10 and FCU is Use and actually FCU is NOT installed in the water loop the unit stop operation in cooling mode when the leaving water temperature is below 10 C Example If Stop temp is set as 10 and FCU is Not use and actually FCU is installed in the water loop the Stop temp is not used and the unit do...

Page 51: ...Auto Driving mode Heating Heating Cooling Air conditioning If heating mode is selected heating cooling or cooling can not be selected Depending on the air outflow control selection value the water air related setting value is displayed on the screen Data logging It is the function to set the operation reference value in Seasonal Auto mode Password initialization air conditioner general DX ventilat...

Page 52: ...ime duration operation time of DHW tank heating stop time of DHW tank heating and delay time of DHW tank heater operating Active time This time duration defines how long time DHW tank heating can be continued Stop time This time duration defines how long time DHW tank heating can be stopped It is also regarded as time gap between DHW tank heating cycle Boost heater delay time This time duration de...

Page 53: ...led 2nd circuit function using mixing kit Use External Pump This function can be set to control the external water pump 3rd Party Boiler This function is to configure the 3rd party boiler to be controlled Meter interface It is the function that can check the status of energy and power on screen It collects and calculates power or calorie data to create data for energy monitoring and energy warning...

Page 54: ...e power supply terminal board and the ground may decrease to approx 2 0 MΩ as a result of refrigerant accumulation in the inter nal compressor If the insulation resistance is less than 2 0 MΩ turn on the main power supply 1 2 1 Check before Test Run 3 Test Run 2 Test Run Flow chart Is cold water discharged for more than 3 minutes START Operation mode change to Heating mode Operate the unit in heat...

Page 56: ... to ensure the stable system performance 2 Compressor control Cooling and heating load System capacity Linear control Inverter linear control as cooling and heating load increasing Actuator Cooling operation Heating operation Stop state Compressor Fuzzy control Fuzzy control Stop Fan Fuzzy control Fuzzy control Stop EEV Super heating fuzzy control Discharge Temp Control Min Pulse EEV operates with...

Page 58: ...or in the unit Be sure to insert the cushion rubbers before tightening the fixing nut of compressor 5 Remove the rubber caps put on the suction and discharge pipe of the new compressor to release the sealing nitrogen gas 6 Braze the suction and discharge pipe with brazing torch to the compressor 7 Conduct air tight test to check the piping system is free from leakage 8 Connect power cable to the t...

Page 59: ...ble PCB assembly with control case make sure that PCB case is inserted surely in the slit of control case 3 Assemble panel assembly and main PCB Figure 2 Figure 3 Figure 4 Figure 1 ZHBW056A0 ZHBW076A0 ZHBW096A0 ZHBW126A0 ZHBW146A0 ZHBW166A0 CAUTION 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...

Page 60: ...on for Assembling Outdoor Panels after Test Run When assemble the unit panels after replacement make sure that screws of top panel are assembled as shown figure below If screws are not assembled it allows rain come into control box causing defect of unit Figure 5 Figure 6 ZHBW126A0 ZHBW146A0 ZHBW166A0 ...

Page 62: ...g Key Components of Unit 62 1 1 Flow Switch 62 1 2 Water Pump 63 1 3 Electric Heater 64 1 4 Remote Controller 65 1 5 Compressor 66 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 Trouble Shooting ...

Page 63: ... of flow switch or the contact of flow switch is mechanically broken Contact official After Service Center and replace the flow switch Read Checking Key Components of Unit Water Pump carefully to get more detail information Contact official After Service Center and replace the water pump Also check the water quality if there are particles that can yield locking at the shaft of the water pump Check...

Page 64: ... To correct unit PCB s making control signal first check the signal level Use electric voltage meter and measure voltage at CN_MOTOR1 connector on the unit PCB If measured value is not 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 Ⓐ It is ...

Page 65: ...er The measured value should be 220 240 V Also at Relay Contactor B measure electric voltage at port 2 Live and port 6 Neutral with voltage meter The measured value should be 220 240 V 5 For three phase model At Magnet Contact C or Magnet Contact B resistance between port L1 to port T1 port L2 to port T2 and port L3 to port T3 should be 0 ohm Start A YES YES NO Electric heater working time is not ...

Page 66: ...actly you can see Thermostat text at the display of the control panel It is normal condition that power button of control panel does not work when thermostat is installed It is normal condition Basically two features can be operated without user s decision one is system protective operation the other is background water tank heating operation which is heating inside the water tank while space heat...

Page 67: ...virtually same values appear actually or where there is danger to determine that failure of the inverter occurred 2 You can use rectification voltmeter 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 1 2 Is how long power on durin...

Page 68: ...tor 3 Check that parts are firmly secured by tightening screws 4 Check connection of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as specified in above 1 through 4 Carefully check both connector and grounding wires ...

Page 69: ...ode with enduser s decision Classified trouble Trouble is classified two levels according to the seriousness of the problem Slight trouble and heavy trouble Slight trouble In most case this trouble is concerned with sensor problems The outdoor unit is operating under emergency mode operation condition which is configured by DIP switch No 4 of the Main PCB Assembly 1 Heavy trouble As the outdoor un...

Page 70: ...rmal 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 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 1 s 2 s 2 s 1 s 1 s LED01G RED LED02G GREEN Model Main PCB Error Inverter PCB Error Main PCB Inverter PCB ...

Page 71: ...d unit Connector connection error or connection wire break 05 Bad communication between Indoor unit and Main PCB assembly Inverter and Main PCB assembly Heater PCB Heater Unit does not receive signal from PCB Inverter 06 Problem in Refrigerant Outlet side sensor Refrigerant Outlet side sensor disconnection or short circuit 08 Problem in Water Tank sensor Water tank sensor disconnection or short ci...

Page 72: ...e 41 Inv D Pipe Th Error Open Short Inverter compressor discharge temperature sensor disconnection or short circuit 43 High Pressure Sensor Open Short High pressure sensor disconnection or short circuit of inverter compressor 44 Outdoor air Th Error Open Short Air temperature sensor disconnection or short circuit 45 Cond Middle Pipe Th Error Open Short Condenser Middle Pipe sensor disconnection or...

Page 73: ...5 V dc at 25 C Repair or Change the PCB Check the Connector connection Is it normal Estimate the resistance of each sensor Plug the sensor on PCB Heater Is the resistance of the sensor 10 5 k at 25 C Yes Yes No Correct connection Yes No Correct connection No Correct connection Check Flow Chart Display code Title Cause of error Check point Normal condition 01 Remote room air sensor Connector connec...

Page 74: ...2V RD GND BK Check the wire connection Open Short Miswirring Is it normal Check the volt of Main PCB Heater power source DC 12V DC 5V Is the soldering state of connector is normal Yes Yes No Correct connection Or change connection wire Is it normal Yes No Correct connection Or change the PCB Check the installation of wired remote controller Noise interference Is it normal No Adjust the state of in...

Page 75: ... power supply at the unit terminal block Improper connection of power supply cable Main power supply problem Yes No Yes No main PCB Inverter fault Replace after checking Re connect transmission cable No Yes main PCB Heater fault Replace after checking Check the insulation of inverter Check the capacity of main circuit breaker and replace if required If all ok Turn on main circuit breaker Replace m...

Page 76: ...ensor on PCB Heater Estimate the Voltage of each sensor Is the voltage of the sensor 2 5 V dc at 25 C Repair or Change the PCB Check the Connector connection Is it normal Estimate the resistance of each sensor Plug the sensor on PCB Heater Is the resistance of the sensor 5 k at 25 C Yes Yes No Correct connection Yes No Correct connection No Correct connection Check Flow Chart Display code Title Ca...

Page 77: ...he poor soldering 2 Check the insertion condition of the EEPROM 3 Check the PCB Connection Code No Description Cause Normal Condition Check Point 1 Check the EEPROM Direction 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 Direction Check Point ...

Page 78: ...p Operating at control panel Although there is not water flow inside water circuit the flow switch detects as if water is flowing It is due to electrically closed or short of flow switch or the contact of flow switch is mechanically stuck Contact official After Service Center and replace the flow switch Check the air vent If there is air in the unit it can display CH14 Please remove the air by usi...

Page 79: ...s normal condition A A B B NO YES YES YES YES NO NO Leaving water temperature is higher than target water temperature Thermostat is installed Leaving water temperature is higher than 57 C This is unexpected case Turn off the system and call service center If the system is not turned off before it yields error code CH15 very hot leaving water will be generated and it is harmful to human Room air is...

Page 80: ...ses 16 Problem in Sensors Code No Description Cause Normal Condition It is occur when error 17 18 19 is happend at the same time It is t occur when error 17 18 19 is happend at the same time n Error diagnosis and countermeasure flow chart Refer to error code 17 18 19 Trouble shooting Guide ...

Page 81: ...e the PCB Check the Connector connection Is it normal Estimate the resistance of each sensor Plug the sensor on Unit PCB Heater Is the resistance of the sensor 5 k at 25 C Yes Yes No Correct connection Yes No Correct connection No Correct connection Check Flow Chart Display code Title Cause of error Check point Normal condition 17 Problem in Water inlet sensor Connector connection error Faulty PCB...

Page 82: ...perature is higher than target water temperature Thermostat is installed Leaving water temperature is higher than 80 C This is unexpected case Turn off the system and call service center If the system is not turned off before it yields error code CH20 very hot leaving water will be generated and it is harmful to human Room air is not fully heated by under floor heating Wait while room air is heate...

Page 83: ... compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly 1 U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is compressor Wire connection condition normal No Yes Check invert...

Page 84: ...BW076A0 ZHBW096A0 27 26 25 24 23 22 21 P W V U Nw Nv Nu SPM3 1 Wait PCB Inverter DC voltage is discharged after main power off 2 Pull out U V W COMP connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB Inverter needs to be replaced IPM damaged 5 Set the multi tester to diode mode 6 In case measured value is different fro...

Page 85: ... and U V W COMP Connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB Inverter needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 ...

Page 86: ...U V W COMP Connector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB Inverter needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 ...

Page 87: ...und Yes Is input voltage normal No Check L N phase is 230V 15 Check connection condition and wiring if power is abnormal Yes PCB Assembly 1 normal No Check PCB Assembly 1 IPM normality Replace inverter PCB assembly Are the resistance Between each phase and insulation resistance of Inverter compressor normal No 1 Check resistance between each terminal of compressor 2 Check insulation resistance bet...

Page 88: ...4 Check the install condition 5 Check the CT Sensor Output signal ZHBW056A0 ZHBW076A0 ZHBW096A0 Check output the CT Sensor DC 2 5 0 2V ZHBW126A0 ZHBW146A0 ZHBW166A0 Check output pin 2 3 of the CT Sensor DC 2 5 0 2V ZHBW128A0 ZHBW148A0 ZHBW168A0 Check input_current of the CT sensor DC 2 5 0 2V GND CT Sensing Check Point Black Red Vdc ZHBW056A0 ZHBW076A0 ZHBW096A0 ZHBW126A0 ZHBW146A0 ZHBW166A0 ...

Page 89: ... 89 Copyright 2018 LG Electronics Inc All rights reserved Only training and service purposes ZHBW128A0 ZHBW148A0 ZHBW168A0 Inverter PCB CT Sensing Check Point GND INPUT_CURRENT GND INPUT_CURRENT ...

Page 90: ...cking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off 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 Display code Title Cause of error Check point Normal condition 23 DC Link Low Volt DC Link Voltage is below 140 V DC Check CN_ L CN_ N Connection Check Input Vol...

Page 91: ...at the main PCB Heater Refer to wiring diagram 2 Check the DC Link voltage at not operating 280V 3 Check the DC Link voltage at Comp operating 340V 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 CT Sensing Check Point GND Black Red Vdc ZHBW056A0 ZHBW076A0 ZHBW096A0 ...

Page 93: ...ssor 2 Check insulation resistance between compressor terminal and pipe Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnorma...

Page 94: ...ector 3 Set multi tester to resistance mode 4 If the value between P and N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM dam aged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB damaged 27 26 25 24 23 22 21 P W V U Nw Nv Nu P W V U Nw Nv Nu 0 4 0 6 V 27 26 25 24 23 22 21 0 4 0 6 V PFC_IPM check U ...

Page 95: ...ing PCB phase current sensing circuit 1 Set Multi tester DC voltage measurement mode 2 Mesure the below mesureing point DC voltages at Power on standby state 3 If the measurements are outside DC 2 5V 0 2V the parts are decided as burned 3 Connector Check U V W WVC connector check CT Sensing Check Point GND Black Red Vdc ...

Page 96: ...age normal No Check U V V W W U phase is 220 240 V 10 Check connection condition and wiring if power is abnormal Yes Is PCB assembly 1 normal No Check PCB assembly 1 IPM normality Replace inverter PCB assembly Are the resistance between each phase and insulation resistance of Inverter compressor normal No 1 Check resistance between each terminal of compressor 0 188 7 2 Check insulation resistance ...

Page 97: ...fficient Poor INV Comp Discharge sensor LEV connector displaced poor LEV assembly Check outdoor fan constraint screened flow structure Check refrigerant leakage Check if the sensor is normal Check the status of EEV assembly CN_TH3 RED 4Pin Connector WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of power...

Page 98: ...ernal circuit error 1 Bad connection of thermistor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Inverter 114 Injection In Sensor Error Open Short Soldered poorly Internal circuit error 1 Bad connection of thermistor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Inverter 115 Injection Out Sensor Error Open Short Soldered poorly Intern...

Page 99: ...igh pressure connector Defect of high pressure connector Open Short Defect of connector PCB Inverter Open Short Defect of PCB Inverter Is sensor connected to PCB Inverter correctly Connect sensor to PCB correctly Replace corresponding pressure sensor Yes No Replace the pressure sensor Yes No No Yes END After replacement of outdoor unit main PCB Inverter is the system also abnormal Is pressure sens...

Page 100: ...ce Connector Insufﬁcient insertion of housing Damage of wire coating Check the Heat sink and Chassis Panel Checking power source LED Off Damage of wire coating Replacement of inverter PCB Replacement of main PCB It should not be short Refer to 3 15 1 WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at standby state of powe...

Page 101: ...onment interfering the communication Items for checking Checking method of afulty points ڸ Insufﬁcient insertion of wires ڹ Damage of wire coating Interference with wires or wire coating damage with chopping ں Inverter PCB LED Replacement of inverter PCB during LED Off after resetting OK NG ZHBW128A0 ZHBW148A0 ZHBW168A0 ...

Page 102: ... the input power AC 230 V 2 Check the communication wires are correctly connected Adjust the connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly connected 5 Make sure you have connected to the communication line soldering If you do not connect by soldering a communication ...

Page 103: ...evention of phase unbal ance and prevention of reverse rotation of con stant rate compressor Main power wiring fault n Error diagnosis and countermeasure flow chart Items for checking Sub items for checking Installation Checking N phase Checking for open and reverse phase Fuse damage R and S phases AC load Inverter PCB Checking for power phase loss Refer to 3 17 1 Refer to 3 17 2 Refer to 3 17 3 ...

Page 104: ...The part having wave pattern The part that does not generate voltage was upgraded Power module requires checking n Judgment method of open and reverse phase of R S T Operation with replacement of R and S phases only Brown B Black Green Brown B Black Green R S T N R S T N Brown B Black Green Brown B Black Green S R S T N R S T N R S T N Vac Vac Vac ZHBW128A0 ZHBW148A0 ZHBW168A0 ...

Page 105: ...on normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is PCB assembly 1 normal No Yes Replace PCB assembly 1 Yes MAIN PCB assembly 1 normal No Replace MAIN PCB assembly 1 Check Point Check the EEPROM Check sum Direction WARNING Before checking PCB Inverter or each outdoor electric parts w...

Page 107: ...Poor Cond Pipe sensor assembly burned Check outdoor fan constraint screened flow structure Check if refrigerant overcharged Check the status of EEV assembly Check the status of sensor assembly burn CN C PIPE Violet 3Pin Connector Recheck power and installation condition WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minutes after the power is off When measuring at s...

Page 108: ...adable condition of thermal grease on IPM PFCM Check the outdoor fan is driving rightly Display code Title Cause of error Check point Normal condition n Error Diagnosis and Countermeasure Flow Chart Is it good Screw Torque of IPM PFCM No Yes Be tighten the screw of IPM PFCM Change the Inverter PCB Is it normal Resistor between 22 and 23 Pin of IPM PFCM Is it normal thermal grease of IPM PFCM Is it...

Page 109: ...or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor 1Ţ0 2V 3 Replace PCB Inverter if abnormality found Is wire connection of ODU Fan Motor wire normal No Yes Check wiring between OUD fan motor and PCB Inverter Check if Hall Senor and Motor output terminal color is matched Reassemble if abnormality fo...

Page 110: ...ronics Inc All rights reserved Only training and service purposes Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor ZHBW056A0 ZHBW076A0 ZHBW096A0 ZHBW126A0 ZHBW146A0 ZHBW166A0 ZHBW128A0 ZHBW148A0 ZHBW168A0 ...

Page 111: ...ant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 1 Check PCB assembly 1 U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality found Is AC input Wire connection condition normal 1 Check L N connection condit...

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Summary of Contents for Therma V ZHBW056A0

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LG Therma V ZHBW056A0, Service Manual, Page: 98 / 115

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Summary of Contents for Therma V ZHBW056A0

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