LG ARWN038GA2 Service Manual Download Page 9

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LGE Internal Use Only

Safety Precautions

Turn on the power at least 6 hours before
starting operation.

• Starting operation immediately after turning on

the main power switch can result in severe
damage to internal parts. Keep the power switch
turned on during the operational season.

Do not touch any of the refrigerant piping
during and after operation.

• It can cause a burn or frostbite.

Do not operate the air conditioner with the
panels or guards removed.

• Rotating, hot, or high-voltage parts can cause

injuries.

Do not directly turn off the main power
switch after stopping operation.

• Wait at least 5minutes before turning off the

main power switch. Otherwise it may result in
water leakage or other problems.

Auto-addressing should be done in condition of
connecting the power of all indoor and outdoour
units. Auto-addressing should also be done in
case of changing the indoor unit PCB.

Use a firm stool or ladder when cleaning or
maintaining the air conditioner.

• Be careful and avoid personal injury.

Do not insert hands or other objects through the air inlet or outlet while the air conditioner is
plugged in.

• There are sharp and moving parts that could cause personal injury.

Summary of Contents for ARWN038GA2

Page 1: ...nit SERVICE MANUAL R410A MODEL WATER MINI Series CAUTION Before Servicing the units read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com R410A ...

Page 2: ...g and service purposes LGE Internal Use Only Air Conditioner Service Manual TABLE OF CONTENTS Safety Precautions 3 Part 1 General Information 10 Model Names 11 External Appearance 11 Nomenclature 12 Part 2 Outside Units 13 Part 3 Test Run 28 Part 4 Trouble Shooting Guide 34 ...

Page 3: ...of injury or damage to properties only Be sure not to do Be sure to follow the instruction WARNING Installation Have all electric work done by a licensed electrician according to Electric Facility Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source capacity is inadequate or electric work is performed impr...

Page 4: ... for strong wind or earthquake and install the unit 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 installation stand It may cause injury accident or damage to the product When installing and moving the air condition er to another site do not charge it with a different refrigerant from the refrigerant specif...

Page 5: ...t the refrigerant concentration from exceeding the safety limit when the refrigerant leaks Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed ed Should the refrigerant leak and cause the safety limit to be exceeded harzards due to lack of oxy gen in the room could result Do not damage or use an unspecified power cord There is risk of fire electric s...

Page 6: ...duct during operation Do not touch the electrostatic fil ter if the unit is so equipped There is risk of physical injury electric shock or product failure Always check for gas refrigerant leakage after installation or repair of product Low refrigerant levels may cause failure of product Do not install the product where the noise or hot air from the outside unit could damage the neighborhoods It ma...

Page 7: ...ter equipment private power generator high frequency medical equipment or radio com munication equipment may cause the air condition er to operate erroneously or fail to operate On the other hand the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting Do not install the product where it is exposed to sea wind salt spray directly It may ...

Page 8: ...nection may cause water leakage Be very careful about product transportation Only one person should not carry the product if it weighs more than 20kg Some products use PP bands for packaging Do not use any PP bands for a means of trans portation It is dangerous Do not touch the heat exchanger fins Doing so may cut your fingers When transporting the outside unit suspending it at the specified posit...

Page 9: ...or guards removed Rotating hot or high voltage parts can cause injuries Do not directly turn off the main power switch after stopping operation Wait at least 5minutes before turning off the main power switch Otherwise it may result in water leakage or other problems Auto addressing should be done in condition of connecting the power of all indoor and outdoour units Auto addressing should also be d...

Page 10: ... Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 1 General Information 1 Model Names 11 1 1 Indoor Unit 11 2 External Appearance 11 2 1 Outside Unit 11 3 Nomenclature 12 ...

Page 11: ... Only for training and service purposes LGE Internal Use Only 1 Model Names Model Names 1 1 Outside Unit Power Supply 4HP 5HP 6HP 1Ø 208 230V 60Hz 038GA2 048GA2 053GA2 Heat Pump ARWN 2 1 Outside Unit 2 External Appearance 1Ø ARWN038GA2 ARWN048GA2 ARWN053GA2 ...

Page 12: ...menclature Generation Air Discharge Type A Basic Electrical Ratings G 1Φ 220 240V 50Hz 1Φ 208 230V 60Hz Total Cooling Capacity in Btu h EX 038 38 000Btu h Class Combination of Inverter Type and Cooling Only or Heat Pump N Inverter and H P Indicates that this is Water System Outside Unit using the R410A ARW N G 038 A 2 3 1 Outside Unit ...

Page 15: ... 16 1 3 Master and slave unit s EEV control 17 2 Special control 18 2 1 Oil return control 18 2 2 Stopping operation 20 3 Protection control 21 3 1 Pressure protection control 21 3 2 Discharge temperature control 22 3 3 Inverter protection control 22 3 4 Liquid back control 23 3 5 Pressure switch 23 4 Other control 24 4 1 Initial setup 24 4 2 Vacuum Mode 26 4 3 Black Box Function 27 Function ...

Page 16: ...DIP switch setting Standard Long pipe 2 Heating mode Tc can be set by initial DIP switch setting Standard Long pipe Note By setting DIP switch Te and Tc are decided simultaneously 1 1 Normal operation Compressor Main EEV 4 way valve Fuzzy control Full open OFF OFF Fuzzy control Fuzzy control ON Cooling operation Heating operation Actuator Stop Close Stop state Fuzzy Control Stop Set frequency Fuzz...

Page 17: ... control 1 EEV control EEV operates with fuzzy control rules to keep the degree of super Heat about 3 C at the evaporator out let stable during heating mode The degree of Superheat Tsuction Tevaporation Tsuction temperature at suction pipe sensor C F Tevaporation evaporation temperature equivalent to low pressure C F Function ...

Page 18: ...peration time 3min for running step Starting condition every 3hours operate Oil return process ends if compressor protection control starts Normal control OFF Max pulse 40Hz Ending Normal control OFF Max pulse Setting Value Running Normal control OFF Max pulse 25Hz Starting Hot gas bypass valve 4way valve Main EEV Inv Compressor Component OFF Min pulse Normal control Ending ON 1200 pulse 1200 puls...

Page 19: ...process ends if compressor protection control starts Outside Unit Indoor Unit OFF Min pulse Normal control Ending ON 1200 pulse 1200 pulse Running OFF Min pulse Normal control Starting Hot gas bypass valve 4way valve Main EEV Inv Compressor Component Normal control OFF Max pulse 25Hz Starting Normal control OFF Max pulse Setting Value Running Normal control ON Max pulse 25Hz Ending Oil return sign...

Page 20: ... 15min Before 15min ON After 15min Before 15min Min pulse Note OFF OFF Max pulse 0Hz Operation Hot gas bypass valve 4way valve Main EEV Inv Compressor Component After 15min Before 15min ON After 60min After 15min Before 15min Min pulse Note OFF OFF Max pulse 0Hz Operation Hot gas bypass valve 4way valve Main EEV Inv Compressor Component Function 2 2 2 Stopping operation on heating mode ...

Page 21: ...Frequency holding frequency or RPM is not increasing can decrease 3 Protection control Pressure Range Compressor Hot_gas Pd 4003kPa Stop On Pd 3676kPa 5Hz 4sec Pd 3448kPa Normal control Pd Target press Normal control Off Pressure Range Compressor Hot_gas Ps 739kPa after 3sec 5Hz 7sec Ps 739kPa Normal control Pressure Range Compressor Hot_gas Ps 229kPa after 10sec Stop On Ps 229kPa before 10sec 5Hz...

Page 22: ...al Use Only Function Temperature Range Compressor Td 115 System stop 105 Td 115 Frequency down Td 105 Pressure control Temperature Range EEV Td 115 System stop 95 Td 115 Emergency SH control 90 Td 95 Keep current control Td 90 SH control Normal Operation Frequency Down System Stop AC Input Current 15 5A or less 16A or more 25A or more Compressor Current Cooling Heating 23 26A or less 23 26A or mor...

Page 23: ...V AC Never touch the connecting terminal with hand nor short two wires directly 3 4 Liquid back control Cooling mode Heating mode The logic starts after 9min on heating mode and 4min on cooling mode from the compressor running Tdis Tc 12 C Discharge temperature Indoor unit s EEV Normal SH control Tdis Tc 16 C SH increasing control SH increasing control Tdis Tc 17 C Discharge temperature Outside un...

Page 24: ...d in 7 segment on PCB for 24sec All dip switches must be set properly before step 1 4 Other control Power is on Model code is displayed 3sec Total capacity is displayed 2sec Heat pump Display 2 is default value Cooling only no display Factory setting 25 is normal Model Type 24 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Function...

Page 25: ...essing begins when address red button in Main PCB is pressed for 6sec During auto addressing 7 segment on main PCB displays 88 After auto addressing the number of indoor units is displayed in 7 segment for 30sec The address of each indoor unit is displayed on each wired remote controller Push address red button for 6sec Auto address starts Auto address is in progress max 15min The number of indoor...

Page 26: ...U addition replacement Master Main PCB D W ON No 11 14 Vacuum mode setting Outside unit V V OPEN Main Lev SC Lev OPEN IDU Lev OPEN Outside unit power reset Press the black button Main PCB 5sec Main PCB SW01S Main PCB SW02B Main PCB SW01V Outside unit operation stops during vacuum mode Compressor can t operate Vacuum mode setting method Vacuum mode cancellation method Master Main PCB D W OFF No 11 ...

Page 27: ...n Outside unit main PCB and thus making error analysis cause possible Saving process Making Data Save EEP data data saving place select file save Data Loading Method Press the black button 5sec EEPROM Main Micom data Loading EEPROM data save to PC by using Save EEP data in LGMV Yellow LED LED01C stops when data is loading After completion it is starts blinking about 20sec IDU Outside unit stop Fun...

Page 29: ...eck if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Check if there are any problems in automatic addressing or not Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outside units 1 Checks Before Test Run CAUTION when cutting main power of the Multi V Always apply main power ...

Page 30: ... Heating failure fre quent defrosting No operating sound at applying power Heating failure frozen outside heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Bad connector contact Coil failure EEV clogged EEV clogged Check resistance between terminals and chassis Change strainer Che...

Page 31: ...lectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 1 Location of setting Switch 3 DIP Switch Setting Test Run Main PCB SW01B DIP S W SW02B DIP S W 7 Segment SW02V Auto addressing ...

Page 32: ...wer is connected Check outside unit setting The number on the 7 segment is displayed in order after the power is connected This number represents the setting condition Mode code If the applicable dip switch is not set correctly the product may not operate properly CAUTION SW01B SW02B 7 segment SW01B 1 2 3 4 5 6 7 ON SW02B 1 2 3 4 5 6 7 ON Model Code Unit HP Powersupply Ref 120 4 121 5 1Ø 208 230V ...

Page 33: ...mode when tem perature of circulation inlet water is under 10 C 50 F You should use an anti freeze 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ON 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON 1 2 3 4 5 6 7 ON After operating the dip switch to...

Page 35: ...nd service purposes LGE Internal Use Only 1 The phenomena from main component failure 36 2 Checking Method for Key Components 2 1 Compressor 37 2 2 Electronic Expansion Valve 38 2 3 Inverter IPM Checking Method 41 2 4 Other 42 3 Self diagnosis function 43 Trouble shooting guide ...

Page 36: ... Not operating Stop during running Abnormal noise during running Heating failure fre quent defrosting No operation sound after switching ON the power supply Heating failure frozen outside heat exchanger part Low pressure error or discharge temper ature error Motor insulation broken Strainer clogged Oil leakage Motor insulation failure R S T misconnection Bad connector contact Coil failure EEV clog...

Page 37: ...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 gen eral movable tester For analog and digital mode 1 2 Is how long power on during operation...

Page 38: ...ously in the ON state motor will not operate smoothly and start vibrating EEV valve operation ø1 ON ON OFF OFF OFF OFF OFF ON ON ON OFF ø2 ON ON ON ON OFF OFF OFF ON ON ON OFF ø3 OFF OFF OFF ON ON ON OFF OFF OFF OFF OFF ø4 OFF OFF OFF OFF OFF ON ON ON ON ON OFF Output ø No Output state 1 2 3 4 5 6 7 8 9 10 11 Valve open Angle close pulse open Full open 1350 pulses At power ON open angle signal of ...

Page 39: ... Internal Use Only EEV Coil and body Outside unit Remove and assemble the coil Lead wire Coil part Body A part Remove Assemble Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body Checking Method for Key Components ...

Page 40: ...ction 1 Check the resistance between coil terminal red white red yellow red orange red blue 2 If the estimated resistance value is in 52 3 then the EEV is normal Replace EEV Outside unit 1 Check the resistance between coil terminal brown white brown yellow brown orange brown blue 2 If the estimated resistance value is in 150 10 then the EEV is normal Replace EEV Indoor unit 1 Operate indoor unit w...

Page 41: ...N terminal of IPM is short 0Ω or open hundreds MΩ PCB needs to be replaced IPM damaged 5 In the measured value with resistance mode should be within 28kΩ 10 6 In case measured value is different from the table PCB needs to be replaced PCB damaged Red and black are the measuring terminals of multi tester P terminal black N terminal red U terminal red 28kΩ 10 Open V terminal red 28kΩ 10 Open W termi...

Page 42: ...hort value is 0 then the resistor is normal 3 Set the multi meter to resistance mode confirm that the resistance value of the resistor is around 270kΩ Check and replace inferior components Guide of check electrolytic capacitor and resistor for voltage distribution In case that the control box is opened and before checking electrical parts it should be checked that the LED 01Y turned off wait 3min ...

Page 43: ...ror between wired remote controller and indoor unit Occurs when indoor unit communication signal is not received from the wired remote controller 0 4 Indoor unit drain error Drain pump and float switch error 0 5 Communication error between outside unit and indoor unit When the indoor unit does not receive the outside commu nication signal continuously for 5 minutes or more 0 6 Indoor unit pipe out...

Page 44: ...tween Outside unit PFC and inverter board Outside unit inverter compressor current detection CT sensor disconnection or short circuit 4 0 1 Outside unit inverter compressor CT sen sor error Outside unit inverter compressor current detection CT sensor disconnection or short circuit 4 1 1 Outside unit inverter compressor dis charge temperature sensor error Outside unit inverter compressor discharge ...

Page 45: ... or short 7 3 1 Outside unit inverter PCB input instant over current Peak Outside unit inverter PCB input instant over current Peak exceeded 7 4 1 Outside unit inverter PCB phase imbal ance When the outside unit inverter PCB input current is differ ent 8 6 1 Outside unit PCB EEPROM error Communication error between Outside unit MICOM and EEPROM or EEPROM missing 8 8 1 PFC PCB EEPROM error Communic...

Page 46: ...ermeasure flow chart Is sensor properly connected to PCB Is the resistance value of sensor normal Connect properly to PCB Change the sensor Change the PCB Yes Yes No No CN ROOM Indoor air temp sensor CN PIPE2 Pipe outlet temp sensor CN PIPE1 Pipe inlet temp sensor Measure the resistance of outlet pipe temp sensor Error No Error Type Error Point Main Reasons 01 Indoor unit air sensor error Indoor u...

Page 47: ...ould be turned on before Auto Addressing 03 No transmission between cabled remote controller indoor unit Error No Error Type Error Point Main Reasons The remote controller did not receive the sig nal from indoor unit during specific time 1 Remote controller fault 2 Indoor unit PCB fault 3 Connector fault Wrong connection 4 transmission cable problem Error diagnosis and countermeasure flow chart CN...

Page 48: ... filled half with condensate water half level of float switch Is drain pump working Sound drain noise contact etc Replace float switch Replace Indoor PCB or reconnect the connector Yes Yes No No Is Float switch short On measuring its resistance No Yes Drain pump blocked by foreign particles Yes No In indoor unit PCB Does the terminal voltage for drain pump has 220V output Replace indoor unit PCB R...

Page 49: ...served Only for training and service purposes LGE Internal Use Only Indoor PCB drain pump connector Check input of 220V Marked as CN DPUMP float A Point to check rotating Float switch Housing CN FLOAT Float switch connector Standard of drain pipe head height slope MAX 450 ...

Page 50: ...ide PCB fault Replace after checking Re connect transmission cable No Yes Indoor PCB fault Replace after checking Note1 Transmission from IDU is normal if voltage fluctuation 9V 9V exists when checking DC voltage of communication terminal between IDU and ODU Is total number of indoor units connected displayed after auto addressing No END If the DC voltage between transmission terminal A B of indoo...

Page 51: ...operation mode is fixed by dip switch setting Dip switch Setting Dissolution method CH07 with remote controller 1 Error removal method Turn off remote controller by pressing the On Off button on the cabled remote controller The error code will be removed automatically after few seconds With cableless remote controller Turn off indoor unit and then turn on by changing the operation mode The error w...

Page 52: ...amage Error No Error Type Error Point Main Reasons Indoor unit EEPROM error Error diagnosis and countermeasure flow chart After replacing the indoor unit PCB make sure to be done to do Auto addressing and input the address of central control If ODU Dry Contact function is set different mode operation error may be occurred because the operation mode is fixed Replace the indoor unit PCB and then mak...

Page 53: ...ctor connection proper Yes No Connect properly Is fan motor normal Replace indoor unit fan motor It is normal when check hall sensor of indoor fan motor as shown below Yes No k Replace indoor unit PCB Checking connection state of fan motor connector 1 4 5 6 7 1 5 6 7 4 4 4 4 Each termainl with the tester Tester TH chassis hundreds k hundreds k hundreds k hundreds k TD chassis Normal resistance 10 ...

Page 54: ...re Reassemble or manage if abnormality found Is inverter PCB assembly power connection normal No Check connection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Yes Is input voltage normal No Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Yes Is ...

Page 55: ...lectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Inverter PCB bridge diode wiring Compressor wire connector connection Measuring input voltage ...

Page 56: ...mage DC Link voltage sensing part 5 Input voltage low Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Yes Yes Recheck power and installation condition Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly power connection normal No Check connection between inve...

Page 57: ...Troubleshooting Guide 57 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Inverter PCB bridge diode wiring Measuring input voltage ...

Page 58: ...ortion 2 Check Covering Indoor outside Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor 0 34 0 35 7 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and in...

Page 59: ...oting Guide 59 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection ...

Page 60: ...780V 1 Input voltage abnormal 2 ODU inverter PCB damage DC Link voltage sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Replace inverter PCB assembly Is inverter PCB assembly nor...

Page 61: ...ation 4 Check refrigerant pressure Reassemble or manage if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check resistance between each terminal of compressor 0 34 0 35 7 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Is compressor Wire connection condition...

Page 62: ...Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connection Measuring input voltage U W V ...

Page 63: ... Yes Is the resistance of discharge temperature sensor normal Replace discharge temperature sensor Is the amount of refrigerant normal refer refrigerant part Weld reconnect the cracked portion and recharge refrigerant Is there pipe crack or trace of leakage Change the amount of refrigerant Charge additive amount Is EEV in outside unit normal at heating operation refer electric component part Repla...

Page 64: ... 3 times successive compres sor off due to over increase of high pres sure by high pressure sensor Over increase of dis charge pressure of compressor 34 Is service valve opened No Open service valve Are transmission cable pipe connection normal Yes No Is refrigerant amount normal refer refrigerant part Yes No Is fan normal Indoor fan during heating Outside fan during cooling Yes No Yes Adjust refr...

Page 65: ...ned Open service valve Are transmission cable piping normal Yes No Is amount of refrigerant normal refer refrigerant part Yes No Is fan normal in heating outside fan in cooling indoor fan Yes Adjust the amount of refrigerant Additive charge check transmission piping correction Check and replace related parts error 105 108 reference Is strainer Ok No Replace the strainer No Replace the pressure sen...

Page 66: ...l state of power supply 1 Input voltage abnormal T N 2 ODU inverter PCB damage CT sensing part Error Diagnosis and Countermeasure Flow Chart Is input voltage normal No Yes Recheck power and installation condition Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal No Yes Replace i...

Page 67: ...verter Error diagnosis and countermeasure flow chart Check the resistance inverter compressor discharge temperature sensor Sensor connection to PCB is normal Is the resistance of sensor normal Insert sensor connector to PCB properly Replace sensor Replace corresponding outside PCB Yes No No Is sensor resistance value same as temperature value of LGMV Yes Yes No Replace corresponding sensor Check t...

Page 68: ...ion of high pressure connector 2 Defect of high pressure connector Open Short 3 Defect of outside PCB Error No Error Type Error Point Main Reasons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of low pressure Sensor error of high pressure 42 43 Is sensor connected to PCB correctly Connect sensor to PCB correctly Yes No No After replacement of outside unit mai...

Page 69: ...or Type Error Point Main Reasons Abnormal value of sensor Open Short Abnormal value of sensor Open Short Abnormal value of sensor Open Short Sensor error of outside air temper ature Piping temperature sensor error of heat exchanger in outside unit heat exchanger A B Compressor suc tion temperature sensor error 44 46 45 Is sensor connected to PCB correctly Is sensor value correct Connect sensor to ...

Page 70: ... data of LGMV Yes Adjust the capacity of indoor and outdoor unit No Check transmission cables between indoor and outdoor unit End 1 130 more than outdoor unit rated capacity 2 Wrong connection of transmission cable piping 3 Defect of outdoor unit PCB Error No Error Type Error Point Main Reasons Sum of indoor unit capaci ty exceed outdoor unit capacity specification Over Capacity Sum of indoor unit...

Page 71: ...oller Transmission error between Inverter PCB Main PCB 52 Error diagnosis and countermeasure flow chart Transmission connector LED in MAIN PCB Transmission connector LED in inverter compressor PCB Is transmission LED Yellow of inverter compressor PCB on Yes No Is noise filter or fuse normal Replace noise filter or fuse No Replace inverter compressor PCB Is transmission cable connected correctly Ye...

Page 72: ...units installed is not same as LGMV data and if transmission of the indoor unit displayed at LGMV is done well then the indoor unit suspected to have some problem and is not appear at LGMV may have following problems wrong connection of transmission cable or power cable fault of power PCB transmission cable duplication of indoor unit number If transmission is not doing well wholly then the Auto Ad...

Page 73: ...on 2 Different EEPROM Version 3 ODU inverter PCB assembly damage Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion 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 inverter PCB assembly normal No Yes Replace inverter PCB assembly Inverter EEPROM inserting point Right ...

Page 74: ...connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 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 AC...

Page 75: ...e purposes LGE Internal Use Only Measuring input voltage Noise filter wiring Inverter PCB assembly power connection Noise filter power connection Inverter PCB assembly Wiring power to inverter PCB on Noise filter Compressor Wire Connection Noise filter input upper part Noise filter output lower part N L N L ...

Page 76: ...and Countermeasure Flow Chart Recheck power and installing condition Yes Is inverter PCB assembly power wiring normal Check abnormal wiring between Inverter PCB assembly bridge diode misconnection disconnection Rewiring if abnormal wiring found No Yes Is input voltage normal Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if pow...

Page 77: ...EPROM 2 EEPROM wrong insertion Error No Error Type Error Point Main Reasons EEPROM Access Error Main PCB EEPROM Error 86 Error Diagnosis and Countermeasure Flow Chart Reset after checking EEPROM assemble condition Replace EEPROM with 24C16 Yes No Yes No Is EEPROM assemble condition normal Is EEPROM 24C16 Recheck power and installation condition ...

Page 78: ... 113 Error diagnosis and countermeasure flow chart Is temperature sensor connector connections are normal Is the value of temperature sensor resistance normal Check and correct connection Replace sensor Replace outside unit PCB Yes Yes No No Sensor resistance 100kΩ over open or 100Ω below short will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor...

Page 79: ...connection are properly connected No Reconnect it After reset can we check supply voltage at PCB when starting heating mode operation No Is 4 way valve coil connected to 4 way valve normally ø No Is 4 Way valve coil resistance normal Change 4 Way valve coil No Yes In case of more than 2 units does master outside unit recognize as more than 2 units Refer to CH 51 make measure Yes Is compressor work...

Page 80: ...ower is supplied in order as follow ODU information is displayed one after the other at main PCB 7 segment 1 Model ID 5HP 60 6HP 61 8HP 62 10HP 63 12HP 64 14HP 65 2 Total Capacity Displayed with HP 3 ODU Type HEAT PUMP 2 Cooling 0 4 Normal mode 25 5 Refrigerant R410a 41 Checking method for outside unit of 3unit system Close all the SVC valves of high low pressure common pipe Operate system Check t...

Page 81: ...P NO MFL67101202 APRIL 2013 ...

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LG ARWN038GA2, Service Manual, Page: 9 / 81

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