LG THERMA V AHBW076A0 Service Manual Download Page 64

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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.

Error diagnosis and countermeasure flow chart

- Refer to error code 17/18/19 Trouble shooting Guide.

Summary of Contents for THERMA V AHBW076A0

Page 1: ...UTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com System GENERAL SVC MANUAL MODEL AHBW Series ...

Page 2: ...AWHP Service Manual TABLE OF CONTENTS Safety Precautions 3 1 General Information 7 2 Features and Controls 10 3 Basic Contol 36 4 Replacement 38 5 Trouble Shooting Guide 42 ...

Page 3: ...n by the user may result in water leakage electric shock or fire Take care to ensure that nobody could step on or fall onto the outdoor unit This could result in personal injury and product damage Always ground the product There is risk of fire or electric shock Always intstall a dedicated circuit and breaker Improper wiring or installation may cause fire or electric shock For re installation of t...

Page 4: ...t at the specified place Improper installation may cause the unit to top ple and result in injury Do not install the product on a defective in stallation stand It may cause injury accident or damage to the product When installing and moving the air condi tioner to another site do not charge it with a different refrigerant from the refrigerant specified on the unit If a different refrigerant or air...

Page 5: ... air conditioner not a precision refrigeration system There is risk of damage or loss of property Keep the unit away from children The heat exchanger is very sharp It can cause the injury such as cutting the finger Also the damaged fin may result in degradation of capacity When installting the unit in a hospital com munication station or similar place provide sufficient protection against noise Th...

Page 6: ...appliance or accident Make the connections securely so that the outside force of the cable may not be applied to the terminals Inadequate connection and fastening may gen erate heat and cause a fire Be sure the installation area does not deteri orate with age If the base collapses the air conditioner could fall with it causing property damage product failure or personal injury Install and insulate...

Page 7: ... 7 Part 1 General Information 1 Model Names 8 2 External Appearance 8 3 Nomenclature 9 ...

Page 8: ...18 C at outdoor ambient tempera ture 36 C DB 24 C WB Unit Capacity Power Source Unit Chassis Heating kW Cooling kW AHBW056A0 4 99 4 99 220 240 V 50 Hz UN4 AHBW076A0 7 00 7 00 220 240 V 50 Hz UN4 AHBW096A0 9 00 9 00 220 240 V 50 Hz UN4 AHBW126A0 12 00 14 50 220 240 V 50 Hz UN3 AHBW146A0 14 00 15 50 220 240 V 50 Hz UN3 AHBW166A0 16 00 16 10 220 240 V 50 Hz UN3 2 External Appearance AHBW056A0 AHBW076...

Page 9: ...to the water circuit 5 Control box PCB and terminal blocks 6 Plate heat exchanger Heat exchange between refrigerant and water 7 Water pump Circulating the water 8 Pressure gage Indicates circulating water pressure 9 Safety valve Open at water pressure 3 bar 10 Expansion vassel Protecting components from water pressure 11 Main PCB assembly Inverter This PCB controls the cycle parts of the unit 12 M...

Page 10: ...ater circuit 5 Control box PCB and terminal blocks 6 Plate heat exchanger Heat exchange between refrigerant and water 7 Water pump Circulating the water 8 Pressure gage Indicates circulating water pressure 9 Safety valve Open at water pressure 3 bar 10 Expansion vassel Protecting components from water pressure 11 Main PCB assembly Inverter This PCB controls the cycle parts of the unit 12 Main PCB ...

Page 11: ...0 240 V 50 Hz 8 380 415 V3 50 Hz Chassis name Function A General heating heat pump H Sanitary heating only T High temperature heating heat pump Heating capacity kW Ex 16 16kW class Model Type W Inverter heat pump H Heat pump Classification N Indoor unit U Outdoor unit B Monobloc Air to Water Heat Pump for R410A ...

Page 12: ...hermistor control Individual control Standard wired remote controller control panel O Deluxe wired remote controller Simple wired remote controller Simple Wired remote controller for hotel use Wireless remote controller simple Wireless LCD remote control CAC network function General central controller Non LGAP Dry contact PQDSA O Network Soluation LGAP O PDI power distribution indicator PI 485 PMN...

Page 13: ... 13 Part 2 Features Controls 1 List of Function 11 2 Features Controls 12 3 Test Run 34 ...

Page 14: ...ly O Two thermistor control X Individual control Standard wired remote controller control panel O Deluxe wired remote controller X Simple wired remote controller X Wired remote controller for hotel use X Wireless remote controller simple X Wireless LCD remote control X CAC network function General central controller Non LGAP X Dry contact PQDSA O Network Soluation LGAP O PDI power distribution ind...

Page 15: ... thermistor control X Individual control Standard wired remote controller control panel O Deluxe wired remote controller X Simple wired remote controller X Simple Wired remote controller for hotel use X Wireless remote controller simple X Wireless LCD remote control X CAC network function General central controller Non LGAP X Dry contact PQDSA O Network Soluation LGAP O PDI power distribution indi...

Page 16: ...S 2 Feature Controls 1 2 Remote controller Controller Configuration e m a N o N 1 Display 2 Change Temperature Button 3 Water Heating Enable Disable Button 4 Power Button 5 Operation Mode Selection Button 6 Silent Mode On Off Button 7 Temperature Setting Mode Button 8 Temperature View Mode Button 9 Function Setting Button 10 Programming Button 11 Direction Button Up Down Left Right 12 Set Clear bu...

Page 17: ...eater 1 Electric Heater 2 Water Tank Electric Heater Water Pump Solar Thermal circulation pump Water Tank Heating Enable Disable Water Tank Heating by Heat Pump Silent Mode ON OFF Water Tank Temp Solar Heating Temp Defrost Water Pipe Anti Freezing Water Tank Disinfection Outdoor Unit Child Lock Not Available Function Slight Trouble Heavy Trouble ...

Page 18: ...ction Press Function Setting button to enter user setting mode The segment will be flashed 1 Press OK CLEAR button to finish the selection The segment will be disappear 2 During Child Lock icon and CL will be displayed during 3 seconds whenever entering any kind of buttons except for view temperature button and setting clear button 3 To release this setting pressing function setting button until i...

Page 19: ... is on pause at the time set by the timer the pause continues 2 4 Weekly Program If necessary an operator can make an On Off reservation of the product for a period of one week On Off schedule of operation for a period of one week No need to turn the unit On Off manually during working days On Off time is scheduled in micom of the wired remote control Operation Time Table Example Mon Tue Wed Thu F...

Page 20: ...rectly If not configured correctly improper operation or degrade of performance can be expected 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 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 OFF ON 3 1 DIP Switch Setting ...

Page 21: ...5 6 7 8 Role when central con troller is equipped As Master X As slave Accessory installation in formation Unit only X X Unit Sanitary water tank is installed X Unit Sanitary water tank Solar thermal system is installed X Emergency operation Level High temperature cycle X Low temperature cycle External water pump in stallation information External water pump is NOT installed X External water pump ...

Page 22: ...cording 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 Emergency operation level When system met trouble it stops operation and wait for user...

Page 23: ...heavy trouble at the same time the system puts higher priority to slight or heavy trouble and operates as if slight or heavy trouble is occurred Therefore sometimes sanitary water heating can be impossible in emergency operation mode When sanitary water is not warming up while emergency operation please check whether the sanitary water sensor and related wiring are connected well or not Emergency ...

Page 24: ...tallation 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 CAUTION 58 58 78 78 0 16 0 16 57 57 1 Function Code Value Press Function Setting button for 3 seconds to enter the installer setting mode When you enter the installer setting mode ini tially function code is displayed on the bottom of the LCD scre...

Page 25: ...ion Factory use only Value 1 Note Default 01 Range Value 2 Note Default Range 03 Function Remote air sensor connection Description Connection information about remote air sensor Value 1 Note 01 Remote air sensor is not connected and not used 02 Remote air sensor is connected and used Default 1 Range 01 02 Value 2 Note Default Range 04 Function Celsius Fahrenheit switching Description Display tempe...

Page 26: ...oller is installed If thermostat is used value should be changed from 2 to 1 Value 1 Note Default 00 Range 00 FF Value 2 Note Default Range 11 Function Setting air temperature in cooling mode Description Adjusting range of Setting Air Temperature in cooling mode Value 1 Note Upper limit of setting range Default 30 C Range 24 30 C Value 2 Note Lower limit of setting range Default 18 C Range 18 22 C...

Page 27: ...tary water heating Description Adjusting range of Setting Sanitary Tank Leaving Water Temperature in sanitary water heating mode Value 1 Note Upper Limit of setting range Default 50 C Range 50 80 C Value 2 Note Lower Limit of setting range Default 40 C Range 30 40 C 18 Function Screed drying mode Description After installing water pipes for under floor heating user can select screed drying mode fo...

Page 28: ... t i m i L r e w o L e t o N 2 e u l a V C 5 1 t l u a f e D C 0 2 0 1 e g n a R 24 Function Setting indoor air temperature range for weather dependent operation Description Setting indoor Max Min temperature for weather dependent operation e g n a r g n i t t e s f o t i m i l r e p p U e t o N 1 e u l a V C 1 2 t l u a f e D C 0 3 0 2 e g n a R e g n a r g n i t t e s f o t i m i l r e w o L e t...

Page 29: ...nitary water temperature This value is required to frequent ON and OFF of water tank heater Default 03 C Range 02 04 C Value 2 Note Determining heating demand priority between sanitary water tank heating and under floor heating Default 00 Range 00 01 Only available when Sanitary Water Tank is installed the disinfection mode will not be operated although Value 1 of Code 26 is set as 01 To use disin...

Page 30: ...e gap between sanitary tank heating cycle Value 3 Note Default Range 20 95 min step 5 min 20 min This time duration defines how long time sanitary tank heater will not be turned on in sanitary water heating operation This time duration defines how long time sanitary tank heating can be continued 2A Function Miscellaneous setting Description Determine electric heater and water heater on and off Val...

Page 31: ... be notified to the unit Note If remote air sensor is connected but this function code is not set correctly the unit can not be controlled by room air temperature Function Code 04 Celsius Fahrenheit switching Temperature is displayed in Celsius or Fahrenheit Function Code 05 Setting temperature selection The unit can be operated according to air temperature or leaving water temperature The selecti...

Page 32: ...to the radiator If cold water enters to the radiator dew gener ation on the surface of the radiator can be occurred Function Code 13 Setting air temperature in heating mode Determine heating setting temperature range when air temperature is selected as setting temperature Only available when remote air temperature sensor is connected Accessory PQRSTA0 should be installed Also Function Code 03 shou...

Page 33: ...er temperature or room air temperature is much belower than target leaving water temperature or target room air temperature Function Code 22 Setting cut off temperature in cooling mode FCU setting included Determine leaving water temperature when the unit is turned off This function is used fr preventing condensation on the floor in cooling mode Value 1 cut off temperature Value 1 is valid when Va...

Page 34: ...e Value 1 and Value 2 of Function Code 24 range of auto adjustable target room air temperature Value 1 and Value 2 of Function Code 25 range of auto adjustable target leaving water temperature Note Weather dependent operation is applied for heating mode only Value 1 of Function Code 23 Auto Adjustable Target Temperature Outdoor air temperature Temperature profile of Weather dependent operation Val...

Page 35: ...f Function Code 26 If Value 1 of Function Code 26 is set as 00 that is disable disinfection mode Value 2 and Value 3 is not used When Value 1 is set as 01 that is enable disinfection mode Value 2 is displayed at the position of Value 1 and Value 3 is displayed at the position of Value 2 It is due to limited width of the remote controller dis play Sanitary water heating should be enable If sanitary...

Page 36: ...erature is below 70 C Example If Value 2 is set as 0 that means heating priority is on sanitary water heating sanitary water is heated by AWHP compressor cycle and water heater In this case the under floor can not be heated while sani tary water heating On the other hand if the Value 2 is set as 1 that means heating priority is on under floor heating sanitary tank is ONLY heated by water heater In...

Page 37: ...p time of sanitary tank heating and delay time of sanitary tank heater operating Value 1 of Function Code 2B This time duration defines how long time sanitary tank heating can be continued Value 2 of Function Code 2B This time duration defines how long time sanitary tank heating can be stopped It is also regarded as time gap between sanitary tank heating cycle Value 3 of Function Code 2B This time...

Page 38: ... out mega ohm check over terminal control board Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the 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 i...

Page 39: ...e power cable and communication cable are completely connected Yes No Yes No Is hot water discharged Yes No Is there any temperature difference between intake and discharged water No Yes Normal Check the load In Out Temp Check pipe length and amount of refrigerant Check for abnormal sound in Refer to Troubleshooting Guide outdoor unit comp Fan others 2 Test Run Flow chart ...

Page 40: ... 40 Part 3 Basic Control 1 Normal operation 37 2 Compressor control 37 3 EEV Electronic Expansion Valve control 37 ...

Page 41: ...ompressor 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 fuzzy control rules to keep The degree of s...

Page 42: ... 42 Part 4 Replacement 1 Replacement Procedure for Compressor 39 2 Replacement Procedure for INV PCB 40 3 Caution for Assembling Outdoor Panels after Test Run 41 ...

Page 43: ...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 terminal board of com pressor and cover the co...

Page 44: ... 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 AHBW056A0 AHBW076A0 AHBW096A0 AHBW126A0 AHBW146A0 AHBW166A0 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 will cause product malfunction ...

Page 45: ...door 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 ...

Page 46: ... 46 Part 5 Trouble Shooting ...

Page 47: ...ey Components of Unit 44 1 1 Flow Switch 44 1 2 Water Pump 45 1 3 Electric Heater 46 2 Self Diagnosis Feature 47 2 1 Concept of Classified Trouble 47 2 2 Error Code List 48 3 Trouble Shooting Guidet 50 Trouble Shooting ...

Page 48: ...s 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 the air vent If there is air in the unit it ca...

Page 49: ...t check the signal level Use electric voltage meter and measure voltage at CN_W PUMP A connector on the unit PCB If measured value is not 220 V 240 V AC while Water Pump Operating Icon 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 normal condition that water pump runs...

Page 50: ...0V 240V AC Also at Relay Contactor B measure electric voltage at port 2 Live and port 6 Neutral with voltage meter The measured value should be 220V 240V AC 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 enough YES NO B Electric pow...

Page 51: ...nel 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 sys tem protective operation the other is background water tank heating operation which is heating in side the water tank while space heating is not used or the system is not working System protective o...

Page 52: ... there is danger to determine that fail ure 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 during operation Does failure appears again when s...

Page 53: ... 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 when replacing the circuit board 1 Replace o...

Page 54: ...e 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 unit has problem the emergency mode operation i...

Page 55: ...ion wire break 05 Bad communication between Indoor unit and PCB Heater Unit does not receive signal from PCB Inverter Main PCB assembly Inverter and Main PCB assembly Heater 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 circuit 09 PCB Program EEPROM Fault Electrical...

Page 56: ...essor OFF 35 Low Pressure Error Excessive decrease of low pressure 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 ...

Page 57: ...heck 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 5k 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 connection error Faulty PCB Heater Faulty sensor...

Page 58: ...swirring 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 installation No Re soldering component Or change the P...

Page 59: ...proper 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 main PCB Inverter after checking Replace TRA...

Page 60: ... of each sensor Is the voltage of the sensor 2 5Vdc 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 5k 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 0...

Page 61: ...tion 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 62: ... 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 using the air ven...

Page 63: ...S 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 not fully heated by under floor heating Wai...

Page 64: ...n 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 65: ...tion Is it normal Estimate the resistance of each sensor Plug the sensor on Unit PCB Heater Is the resistance of the sensor 5k 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 Heater Faulty sensor Open Short Norm...

Page 66: ...ture 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 heated by target temperature of thermostat If Err...

Page 67: ...heck 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 inverter PCB assembly 1 IPM normality Replace inverter PCB assembly 1 Is inverter PCB assembly 1 normal No n Error Diagnosis and Countermeasure...

Page 68: ...f 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 from the table PCB Inverter needs to be replaced PCB Inverter 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 V W R S T ...

Page 69: ... 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 damaged 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 4 0 6 V PFC_IPM check U V W...

Page 70: ...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 between compressor terminal and pipe Replace com...

Page 71: ...5 Check the CT Sensor Output signal AHBW056A0 AHBW076A0 AHBW096A0 Check output the CT Sensor DC 2 5 0 2V AHBW126A0 AHBW146A0 AHBW166A0 Check output pin 2 3 of the CT Sensor DC 2 5 0 2V IN I GND CT Sensing Check Point Black Red Vdc CT Sensing Check Point Inverter PCB 1 2 3 Vdc AHBW056A0 AHBW076A0 AHBW096A0 AHBW126A0 AHBW146A0 AHBW166A0 ...

Page 72: ... Power connection normal No Check connection from terminal block to PCB assembly 1 CN L CN N Yes Is input voltage normal No Yes Is PCB Inverter Normal No Replace PCB assembly 1 Recheck power and installation condition Yes Check L N Voltage is 230V 15 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 73: ...in 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 2 4 2 8V Refer the Picture IN I GND CT Sensing Check Point Black Red Vdc AHBW056A0 AHBW076A0 AHBW096A0 ...

Page 74: ... 74 Vdc AHBW126A0 AHBW146A0 AHBW166A0 P GND ...

Page 75: ...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 abnormality found Is compressor Wire connection condition nor...

Page 76: ... 76 AHBW126A0 AHBW146A0 AHBW166A0 U W V GND U V W GND CT Sensing Check Point AHBW056A0 AHBW076A0 AHBW096A0 Vdc U V W WVC connector check ...

Page 77: ...ble 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 condition 2 Check wire dis...

Page 78: ...turning off the main power R24N between the ends of the resistance will be measured 620 670Ω Short Check Point AHBW056A0 AHBW076A0 AHBW096A0 AHBW126A0 AHBW146A0 AHBW166A0 After turning off the between the ends o be measured 620 6 ...

Page 79: ...ondition 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 between compressor terminal and pipe over 50 MΩ Replace compressor if ab...

Page 80: ...onnector 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 supply after checking the measurement mode o...

Page 81: ...ormal Yes No Adjust the amount of refrigerant Additive charge check communication piping correction Is strainer Ok No Replace the strainer No Replace the pressure sensor Yes Yes Check unit LEV Check unit PCB Inverter Check unit installation conditions Yes Is there pipe crack or trace of refrigerant leakage Weld reconnect the cracked portion and recharge refrigerant No Yes If the temperature differ...

Page 82: ...istor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Inverter 48 Condenser Out 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 Ω Check Point 1 Estimate the resistance of each sensor Unplugged 2 Check the value of the resistor of thermist...

Page 83: ...re 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 sensor OK Check the value of pressure sensor Cf ...

Page 84: ...ation 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 error CH05 CH53 occurs by noise WARNING Before...

Page 85: ...on 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 AHBW056A0 AHBW076A0 AHBW096A0 WARNING Before checking PCB Inverter or each outdoor electric parts wait for 3 minut...

Page 86: ... 86 AHBW126A0 AHBW146A0 AHBW166A0 EEPROM ...

Page 87: ...tdoor 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 standby state of power supply after checking th...

Page 88: ...obstacles 4 Check pipe distortion and abnormality 5 Check service valve is opened Eliminate causes for abnormal condition Check resistance between NO 19 pin and NO 20 pin of PFC module Replace PCB Inverter if abnormality found Is assemble condition of INV PCB Inverter heatsink normal Is PCB Inverter temperature sensing part normal No No Yes Check assemble condition between INV PCB Inverter heatsin...

Page 89: ... 89 AHBW056A0 AHBW076A0 AHBW096A0 AHBW126A0 AHBW146A0 AHBW166A0 Ω PFCM Measuring resistance between No 19 20 pin ...

Page 90: ...r 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 found Is PCB assembly 1 normal No Yes Replace PCB...

Page 91: ... 91 Main PCB AHBW126A0 AHBW146A0 AHBW166A0 AHBW056A0 AHBW076A0 AHBW096A0 Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor ...

Page 92: ...eration 4 Check refrigerant 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 Che...

Page 93: ... 93 Main PCB wiring Check Point N N L N L Noise Filter wiring Check Point L N AHBW056A0 AHBW076A0 AHBW096A0 Input Power Source Check Point ...

Page 94: ... 94 L N N L L L N N N L N L L N AHBW126A0 AHBW146A0 AHBW166A0 Input Power Source Check Point L N N L L L N N N L N L L N AHBW126A0 AHBW146A0 AHBW166A0 Input Power Source Check Point ...

Page 95: ...0 74 0 531 80 0 63 0 459 85 0 54 0 397 90 0 46 0 345 95 0 4 0 3 100 0 34 0 262 Pipe Temp B Constant 3977 Std Temp 25 Resistance 10 Temp Resistance Volt 30 204 35 4 72 25 146 97 4 62 20 107 09 4 492 15 79 4 336 10 58 95 4 149 5 44 47 3 931 0 33 9 3 685 5 26 09 3 416 10 20 27 3 131 15 15 89 2 838 20 12 55 2 546 25 10 2 262 30 8 03 1 994 35 6 49 1 745 40 5 28 1 519 45 4 32 1 316 50 3 56 1 137 55 2 95...

Page 96: ...0 1 26 2 28 85 1 07 2 09 90 0 92 1 9 95 0 8 1 73 100 0 69 1 57 Heatsink Temp B Constant 3500 Std Temp 25 Resistance 200 Temp Resistance Volt 30 2845 99 4 969 0 585 66 4 851 5 465 17 4 814 10 372 49 4 77 15 300 58 4 717 20 244 33 4 657 25 200 4 587 30 164 79 4 508 35 136 64 4 418 40 113 98 4 318 45 95 62 4 208 50 80 65 4 088 55 68 38 3 958 60 58 27 3 82 65 49 88 3 674 70 42 9 3 522 75 37 05 3 365 8...

Page 97: ... 2MΩ Model Resistance Ω at 25 C U V U W V W AHBW126 1 183 1 174 1 181 AHBW146 1 183 1 174 1 181 AHBW166 1 183 1 174 1 181 Resistance Ω at 25 Terminal All models U GND More than 2MΩ V GND More than 2MΩ W GND More than 2MΩ Model Resistance Ω at 25 U V U W V W AHBW056 0 997 0 980 0 965 AHBW076 0 997 0 980 0 965 AHBW096 0 997 0 980 0 965 Resistance Ω at 25 Terminal All models U GND More than 2MΩ V GND...

Page 98: ...P NO MFL68026801 October 2013 ...

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Summary of Contents for THERMA V AHBW076A0

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LG THERMA V AHBW076A0, Service Manual, Page: 64 / 98

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Summary of Contents for THERMA V AHBW076A0

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