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LG ABNQ18GHLA0 Svc Manual Download Page 76

Part 4  Trouble Shooting 

- 76 -

Copyright ©2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

Display

code

Title

Cause of error

Check point & Normal condition

32

High temperature in
Discharge pipe of the
inverter compressor

• Overload operation

(Outdoor fan constraint,
screened, blocked)

• Refrigerant leakage

(insufficient)

• 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 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.

Summary of Contents for ABNQ18GHLA0

Page 1: ...Air Conditioner SVC MANUAL General CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com ...

Page 2: ... List of Functions Accessory 11 2 Air Flow 15 3 Air Purifying 17 4 Installation Functions 18 5 Reliability 24 6 Convenience Functions Controls 25 7 Special Function KIT 33 Part 3 Basic Control 36 1 Normal operation 37 2 Compressor control 37 3 EEV Electronic Expansion Valve control 37 Part 4 Trouble Shooting Guide 38 1 Self diagnosis Function 39 2 Pump Down 41 3 Evacuation All amount of refrigeran...

Page 3: ... 3 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 Safety Precautions 4 2 Model Line Up 7 3 Nomenclature 10 Part 1 General Information ...

Page 4: ...ment is connected to the power cables This volt age is extremely dangerous and may cause death or severe injury if come in con tact with it Do not touch the discharging refrigerant gas during the repair work The discharging refrigerant gas The refrigerant gas can cause frostbite Release the refrigerant gas completely at a well ventilated place first Otherwise when the pipe is disconnected refriger...

Page 5: ... before connect or disconnect connector or parts damage may be occurred Do not use a defective or underrated circuit breaker Use the correctly rated breaker and fuse Otherwise there is a risk of fire or electric shock Install the panel and the cover of control box securely Otherwise there is risk of fire or electric shock due to dust water etc Indoor outdoor wiring connections must be secured tigh...

Page 6: ...arge section and the non charge metal section Earth position If the resistance value is low a disaster such as a leak or electric shock is caused at userʼs side Check the drainage of the indoor unit after the repair If drainage is faulty the water to enter the room and wet floor Check to see if the power cable plug is not dirty or loose If the plug is dust or loose it can cause an electrical shock...

Page 7: ...0 5 12 5 14 1 15 8 Ceiling cassette 4way TP ATNQ18GPLE3 ATNQ21GPLE3 TN ATNQ24GNLE3 TM ATNQ36GMLE3 ATNQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 Ceiling suspended VJ AVNQ18GJLA0 AVNQ21GJLA0 AVNQ24GJLA0 VK AVNQ36GKLA0 VL AVNQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 Ceiling concealed duct High static pressure BH ABNQ18GHLA0 ABNQ21GHLA0 BG ABNQ24GGLA0 ABNQ36GGLA0 BR ABNQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 Low static pressur...

Page 8: ...0 ABNQ18GHLA0 ABNQ18GL2A0 ATNQ21GPLE3 AVNQ21GJLA0 ABNQ21GHLA0 ABNQ21GL2A0 ATNQ24GNLE3 AVNQ24GJLA0 ABNQ24GGLA0 ABNQ24GL3A0 Power supply 220 240V 1Ø 50Hz 220V 1Ø 60Hz Chassis Model Names AUUQ36GH1 ATUQ36GMLE3 AVUQ36GKLA0 ABUQ36GGLA0 AUUQ42GH1 ATUQ42GMLE3 AVUQ42GLLA0 ABUQ42GRLA0 AUUQ48GH1 ATUQ48GMLE3 AVUQ48GLLA0 ABUQ48GRLA0 AUUQ54GH1 ATUQ54GMLE3 AVUQ54GLLA0 ABUQ54GRLA0 No of connectable indoor units ...

Page 9: ...l Ratings G 220 240V 1Ø 50Hz 220V 1Ø 60Hz Capacity Code based on kBtu h units Model Type Q Cooling Only R410A Single A Indoor Unit ATN Ceiling cassette type indoor unit AVN Convertible Ceiling and Floor type indoor unit ABN Ceiling concealed duct type indoor unit A U U Q 2 4 H G 1 Serial Number High Efficiency model Electrical Ratings G 220 240V 1Ø 50Hz 220V 1Ø 60Hz Capacity code Model Type Q Cool...

Page 10: ...LASMA Air Purifying System 17 4 Installation Functions 18 4 1 E S P External Static Pressure Setting 18 4 2 High Ceiling operation 23 5 Reliability 24 5 1 Hot start 24 5 2 Self diagnosis Function 24 6 Convenience Functions Controls 25 6 1 Cooling Operations 25 6 2 Auto cleaning operation 26 6 3 Auto changeover operation 26 6 4 Child Lock Function 27 6 5 Group Control 28 6 6 Sleep Timer Operation 2...

Page 11: ... start O Self diagnosis O Soft dry operation O Convenience Auto changeover O Auto cleaning X Auto operation artificial intelligence O Auto Restart O Child lock O Forced operation O Group control O Sleep mode O Timer on off O Timer weekly O Two thermistor control O Individual control Wired remote controller O Deluxe wired remote controller PQRCUDS0 PQRCUDS0B PQRCUDS0S Simple wired remote controller...

Page 12: ... Drain pump ABDPG E S P control O Electric heater X High ceiling operation X Auto Elevation Grille X Reliability Hot start O Self diagnosis O Soft dry operation O Convenience Auto changeover O Auto cleaning X Auto operation artificial intelligence O Auto Restart O Child lock O Forced operation X Group control O Sleep mode X Timer on off O Timer weekly O Two thermistor control O Individual control ...

Page 13: ...ric heater X High ceiling operation O Auto Elevation Grille X Reliability Hot start O Self diagnosis O Soft dry operation O Convenience Auto changeover O Auto cleaning X Auto operation artificial intelligence O Auto Restart O Child lock O Forced operation O Group control O Sleep mode O Timer on off O Timer weekly O Two thermistor control O Individual control Wired remote controller PQRCVSL0 PQRCVS...

Page 14: ...work solution LGAP X O Device 5 6 kW 7 kW Central Controller Simple Controller X PQCSB101S0 Function controller X PQCSB101S0 PQCSC101S0 Function Scheduler X PQCSB101S0 PQCSD130A0 AC Ez X PQCSZ250S0 AC Smart ll X PQCSW320A1E Option Kit SD card type X PQCSE341A0 PQCSE342A0 ACP Advanced Control Platform X PQCPA11A0E PQCPB11A0E AC Manager X PQCSS520A0E PI485 X PMNFP14A0 PMNFP14A1 DO Digital Output Kit...

Page 15: ... input the left right louver automatically operates with the auto swing or it is fixed to the desired direction 2 2 Auto swing up down By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction 2 3 Chaos swing up down By the Chaos swing key input the upper lower vane automatically operates with the chaos swing or it is fixed ...

Page 16: ... the Jet Cool mode is operat ed In the Jet Cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation In the Jet Cool mode operation the room temperature is controlled to the setting temperature 18 C When the sleep timer mode is input while in the Jet Cool mode operation the Jet Cool mode has the priority When the Jet Cool key is input the upper lower vanes are r...

Page 17: ...oscopic contaminants and dust but also removes house mites pollen and pet fur to help prevent allergic diseases like asthma This filter that can be used over and over again by simply washing with water 3 Air purifying Ionizer Photo Catalyst Coated Mesh Dust particles Odour Dust electrode discharge Odour molecule Generating plasma Polluted Air Purified fresh Air 4 8KV discharge Part 2 Functions Con...

Page 18: ...on Whenever pressing the button Lo Med Hi will be indicated 2 Select the desired air flow rate value with the temperature up s down t button E S P value range 0 255 E S P value will be indicated at the upper right section of the display window 3 When pressing the button currently established E S P value will be set up 4 When pressing the button and button simultaneously for more than 3 seconds aft...

Page 19: ...Part 2 Functions Controls Setting Value Static Pressure mmAq Pa 2 5 25 4 39 6 59 8 78 100 12 8 105 13 9 110 15 2 12 7 115 16 5 14 0 120 17 8 15 3 12 7 125 16 5 14 0 130 17 8 15 3 12 6 135 16 5 13 5 140 17 5 14 5 145 16 5 Unit CMM Unit CMM Setting Value Static Pressure mmAq Pa 4 49 6 59 8 78 10 98 100 20 8 105 23 2 19 5 110 26 0 21 5 115 23 5 19 1 120 26 3 21 6 125 24 0 19 9 130 27 0 22 7 135 25 9 ...

Page 20: ...44 2 38 9 115 44 7 Unit CMM Setting Value Static Pressure mmAq Pa 6 59 8 78 10 98 12 118 85 31 5 90 36 3 29 8 95 41 3 34 5 28 4 100 45 4 39 7 33 5 27 3 105 44 1 38 6 33 1 110 44 2 38 9 115 44 7 Unit CMM Setting Value Static Pressure mmAq Pa 6 59 8 78 10 98 12 118 14 137 95 41 3 100 45 4 39 7 105 49 5 44 1 38 6 110 48 5 44 2 38 9 115 49 8 44 7 42 2 120 50 5 48 1 Unit CMM Models ABNQ42GRLA0 Models A...

Page 21: ...3 16 12 07 10 76 9 23 125 15 66 15 01 14 15 13 06 11 75 10 22 130 16 67 16 02 15 16 14 07 12 76 11 23 135 16 18 15 10 13 79 12 26 140 16 14 14 83 13 30 145 15 89 14 36 Unit CMM Unit CMM Setting Value Static Pressure mmAq Pa 0 0 1 10 2 20 3 30 4 40 5 50 85 10 19 90 12 18 10 71 11 09 95 13 81 12 34 12 19 100 15 16 13 69 13 38 10 71 105 16 30 14 83 14 36 11 85 110 17 31 15 85 15 23 12 86 10 97 115 18...

Page 22: ...id 35 0 Low 30 0 ABNQ54GRLA0 Hi 10 98 50 0 5 0 49 10 98 Mid 45 0 Low 40 0 1450 1400 1340 1450 1400 1340 1270 1210 1090 1370 1310 1260 1060 1020 990 1100 1060 1030 1240 1200 1150 Notes 1 To get the desired Airflow E S P combination from the table set the matching value from the table Value other than that in table will not give the combinations of airflow E S P which are mentioned in the table 2 Ta...

Page 23: ...button will exit settings mode After setup it automatically gets out of setup mode if there is no button input for 25 seconds When exiting without pressing set button the manipulated value is not reflected This function is to adjust FAN Airflow rate according to ceiling height For ceiling type product Ceiling height setting is available only for some products Ceiling height of ʻVery highʼ function...

Page 24: ...rol is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature While compressor off the indoor fan repeats low airflow speed and stop While the intake air temp is between compressor on temp and compressor off temp 10 min dehumidification opera tion and 4 min compressor off repeat Compressor ON Temp Setting Temp 0 5 C Compres...

Page 25: ...he compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds not emergency conditions Compressor turned off when intake air temperature is in between 0 5 C of the setting temp limit for three minutes continuously intake air temperature reaches below 1 0 C of the temperature of setting temp Compressors three minutes time delay After compressor o...

Page 26: ...ing set temperature and fan speed The unit will memorize the above conditions and start with same memorized condition 6 2 Auto cleaning operation Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion The function is easy to operate as it is accesse...

Page 27: ... Lock the CL Will be indicated approx 3 seconds at the temperature Display section before resuming to the previous mode After the setting of the CL if another button is setup the button can not be recognized as the CL is indicated at the temperature display section for approx 3 seconds 1 If the CL function is wanted to be used under the operation standby state press the button and Button for appro...

Page 28: ...mote controller you must change the master slave setting from the indoor unit Indoor units the master slave configuration of the product after completion of indoor unit power ʻOFFʼ and then ʻONʼ the power after 1 minutes elapsed sign up For ceiling type cassette and duct product group change the switch setting of the indoor PCB For wall mount type and stand type product change the master slave set...

Page 29: ...er mode is input while in heating cycle mode the airflow speed of the indoor fan is set to the medi um 6 7 Timer On Off 6 7 1 On Timer Operation When the set time is reached after the time is input by the remote control the appliance starts to operate The timer LED is on when the on timer is input It is off when the time set by the timer is reached If the appliance is operating at the time set by ...

Page 30: ...ton You can setup two reservations weekly reservation 1 and weekly reservation 2 for a day 3 Please move to date setup part by using button If date indication blinks please setup date You can setup date from Monday to Sunday 4 Please move to AM PM setup part of turning on by using button 5 Please move to hour setup part of turning on by using button It is the part to setup the time at which air co...

Page 31: ...eekly reservation setup for the day that you set is finished 12 If you setup with the method identical with above by selecting the day that you d like to setup it operates weekly reservation If you setup both turning on reservation time and turning off reservation time identically it doesn t operate reservation drive 13 Weekly reservation explanation Turning on time Under bar the indication that t...

Page 32: ...or sure 1 Pressing button will exit settings mode After setup it automatically gets out of setup mode if there is no button input for 25 seconds When exiting without pressing set button the manipulated value is not reflected h The function of 2TH has different operation characteristics according to the product Thermistor Table This is the function to select the temperature sensor to judge the room...

Page 33: ...space environment 7 3 Auto Elevation Grille Auto Elevation Grille is automatically down to height of max 3 1 m So it enables to install the Indoor unit at high ceiling space And Auto Elevation Grille makes you cleaning the filter easily 7 1 Low Ambient control This Function is for cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid back is pre...

Page 34: ...front panel Do not drop it down or into water Or else there is worry about trouble failure Do not press hard the Remote Controller button with nail ball point pen or other sharp substance Or else there is worry about trouble failure In case when obstacle such as curtain hides the signal reception part of receiver in between the space interval Remote Controller operation is infeasible Lift grill fr...

Page 35: ...ss the up button Then suction grill goes up and enters into the front panel 1 Stop the Air Conditioner Operation 2 Descend the Suction Grill 3 Raise the Suction Grill Depress the stop button Make use of this when you want to stop it at your wished posi tion 4 Stop the Suction Grill during Rising Always stop the air conditioner operation for safety before operating lift grill Take heed _ there is w...

Page 36: ... Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 3 Basic Control 3 Basic Control 1 Normal operation 37 2 Compressor control 37 3 EEV Electronic Expansion Valve control 37 ...

Page 37: ...y control Maintain evaporating temperature Te to be constant on cooling mode by fuzzy control to ensure the stable system performance 2 Compressor control Cooling load System capacity Linear control Inverter linear control as cooling load increasing Actuator Cooling operation Stop state Compressor Fuzzy control Stop Fan Fuzzy control Stop EEV Super heating fuzzy control Min Pulse EEV operates with...

Page 38: ... Error Indicator Outdoor 40 2 Pump Down 41 3 Evacuation 42 4 Gas Charging 43 5 Cycle Part 44 6 Electronic Parts 45 6 1 The Product doesn t operate at all 45 6 2 The Product doesn t operate with the remote controller 46 6 3 The Compressor Outdoor Fan are don t operate 47 6 4 When indoor Fan does not operate 48 6 5 When the louver does not operate 49 6 6 Troubleshooting Indoor Error 50 6 7 Troublesh...

Page 39: ...ng table If more than two troubles occur simultaneously primarily the highest trouble fo error code is expressed After error occurrence if error is released error LED is also released simultaneously To operate again on the occurrence of error code be sure to turn off the power and then turn on Having or not of error code is different from Model Indoor Error 00 No Error ON 01 Indoor Room themistor ...

Page 40: ...es OFF 2times 4times OFF 2times 6times OFF 2times 7times OFF 2times 9times OFF 3times 2times OFF 4times 0 OFF 4times 1time OFF 4times 3times OFF 4times 4times OFF 4times 5times OFF 5times 1times OFF 5times 3times OFF 6times 0 OFF 6times 1times OFF 6times 2times OFF 6times 5times OFF 6times 7times OFF 21 DC Peak IPM Fault 22 Max CT CT2 23 DC Link Low Volt 24 Pressure switch Heater Sink 26 DC Comp P...

Page 41: ...mpressor is going to be off because of low pressure You should return the Dip Switch to operate normally after finishing the operation Improper Pump down will lead to product turn off along with LED green red off with in 20 min utes from the initial start 6 Pump Down Dip S W Setting Power on Red LED On Green LED Off Comp on Red LED On Green LED On Pump Down Start Red LED On Green LED Off Liquid Va...

Page 42: ...gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed WARNING Use a vacuum pump or lnert nitrogen gas when doing leakage test or air purge Do not compress air or Oxygen and do not use Flammable gases Otherwise it may cause fire or ex...

Page 43: ...th a little at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valveʼs service port Stopping partway will allow the gas to be discharged If the system has been charged with liquid refrig e...

Page 44: ...rence between intake and discharge air depends on room air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle in cooling mode 1 The suction pressure is usually 8 5 9 5kg cm2G Cooling at normal condition R410A 2 The temperatu...

Page 45: ...emedy 1 Check the power outlet 2 Replace PCB Assembly 4 Replace PCB Assembly 5 Replace PCB Assembly Turn on the main power again Turn off the main power and wait for 10 seconds Yes No A Beeping sound is made from the indoor unit Check the voltage of power supply AC220V AC240V 50Hz and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of ...

Page 46: ...d is made from the indoor unit Refer to 10 1 Check the voltage of power AC220V AC240V 50Hz Is it possible to turn on the unit by ON OFF button on display Yes No Is the remote controller working properly Yes When the mark is displayed in LCD screen replace battery No Check the contact point of CN DISP 1 2 connector Re connector Check display PCB Assembly Voltage between CN DISP1 should be DC 5V If ...

Page 47: ...e in bad connection or are not engaged Compressor Outdoor fan is stopped Check the related circuit of R02H 12 1K R01H 1K R04H 6 2K R03H 1K C01H 102 C02H 102 Micom pin No Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240...

Page 48: ...main power Check the connection of CN FAN Check the Fan Motor Check the Fuse AC250V T2A Turn on the main power Check the related circuit of indoor Fan Motor The pin No 38 of micom and the part for driving SSR Q01M Check the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF The voltage of Pin No 1 orange and 3 black...

Page 49: ... Connector Check the soldering condition on PCB of CN U D or CN0L R Connector Check the operating circuit of the vertical louver Confirm that there is DC 12V between pin of CN U D CN0L R and GND Confirm that there is a soldering short at following terminals Between 1 2 3 and 4 of MICOM Between 17 18 19 and 20 of MICOM Between 4 5 6 and 7 of IC01M Between 5 6 7 and 8 of IC01M 6 5 When the louver do...

Page 50: ...oltage 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 Indoor unit PCB 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 01 02 06 Indoor air sensor Indoor inlet pipe senso...

Page 51: ...the Volt Wired R C V 12Vdc 12V RD GND BK Check the wire connection Open Short Miswirring Is it normal Check the volt of main PCB 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 A...

Page 52: ...loat moves top position Is it normal Check the wire connection Open Soldered poorly Is the float switch clean Yes Yes No Check Drain Pump Yes No Correct connection Or re soldering PCB Is the resistance of Drain Pump Normal about 400Ω Yes No Change the Drain Pump Is the drain pump clean Yes No Clean drain pump No Clean float switch Is the resistance of f loat switch normal short Yes No Change the f...

Page 53: ...or 1 Check the poor soldering 2 Check the insertion condition of the EEPROM 3 Check the PCB Connection Display code Title Cause of error Check point 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 54: ...Voltage is about input voltage x 1 414 if the Voltage does not come with the above Voltage Check the power input Replace the PCB Motor 2 Check the Voltage Black line to White the Voltage is DC 15V Check the Power input Replace the motor Check the Motor 1 Check the shaft if the shaft is not turn smoothly the Motor Power IC is defected replace the motor 2 Check the motor resistance if the shaft is t...

Page 55: ...ck the resistance between communication line and GND Normal Over 2M Is connector for communication correctly connected Is it normal Yes No Correct connection Check Flow Chart 05 53 Communication Indoor Outdoor The connector for trans mission is disconnected The connecting wires are misconnected The communication line is break Outdoor PCB is abnormal Indoor PCB is abnormal Synchro of IDU is abnorma...

Page 56: ...A0 Display code Title Cause of error Check point Normal condition 21 High current into the compressor Compressor blocked Disconnection shortcircuit inside compressor Over load operation Outdoor fan constraint screened blocked Burned parts inside PCB Check compressor constraint Check compressor wire open short Check compressor insulation damage Check outdoor fan constraint screened flow structure C...

Page 57: ...0 438 at 25 C 1 Remove the connectors to the PCB 2 Measure the resistance between the lines of each terminal of the com pressor Refer to Table 1 3 Measure the resistance between the each terminal and the chassis pipe of the compressor Refer to Table 2 4 If the measurements are distinctively different from Table 1 and 2 the compressor is decided to be burned Model Resistance Ω at 20 C Terminal Inve...

Page 58: ...21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 IPM Position Pin number AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 ...

Page 59: ...charged after main power off 2 Pull out V 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 damaged 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...

Page 60: ...it until inverter PCB DC voltage is discharged after main power off 2 Pull out AC L AC N connectors 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 damaged 5 Set the multi tester to diode mode 6 In case measured value is different from the table PCB needs to be replaced PCB da...

Page 61: ...n wiring again if abnormality found Yes Is input voltage normal No Check L N phase is 230V 15 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly 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 termina...

Page 62: ...t signal AUUQ36GH1 ATNQ36GMLE3 Check output the CT Sensor DC 2 5 0 2V ABNQ36GGLA0 AVNQ36GKLA0 AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 Check output pin 2 3 of the CT Sensor DC 2 5 0 2V ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 5V_GND 5V_GND 5V_GND Input_I Input_I Input_I AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18G...

Page 63: ... Part 4 Trouble Shooting CT Sensing Check Point Inverter PCB 1 2 3 Vdc GND GND GND I_CT I_CT I_CT CT Sensing Check Point Black Red Vdc AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 ...

Page 64: ...n Error Diagnosis and Countermeasure Flow Chart Is Inverter PCB assembly Power connection normal No Check connection from terminal block to Inverter PCB assembly CN L CN N Yes Is input voltage normal No Yes Is Inverter PCB Normal No Replace inverter PCB assembly Recheck power and installation condition Yes Check L N Voltage is 230V 15 WARNING Before checking PCB or each outdoor electric parts wait...

Page 65: ...PCB Refer to outdoor 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 5V_GND 5V_GND 5V_GND DC_LINK DC_LINK DC_LINK AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A...

Page 66: ... LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting DC_LINK DC_LINK DC_LINK GND GND GND Black Red Vdc AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 ...

Page 67: ...G Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Vdc AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 P GND ...

Page 68: ...tput voltage 2 5Vdc 10 25 Input voltage Abnormal Input voltage 140Vac 300Vac Check the power source Check the components Display code Title Cause of error Check point Normal condition Is Inverter PCB Normal No Replace inverter PCB assembly Is input voltage normal No Check L N Voltage is 230V 15 Yes Input Power Source Check Point Recheck power and installation condition Yes n Error Diagnosis and Co...

Page 69: ...ned blocked Burned parts inside PCB IPM Burned PCB phase current sensing circuit parts Check compressor locking Compressor wire open short Check compressor insulation damage Check outdoor fan constraint screened flow structure Check if IMP burned refer to CH21 Check on PCB current sensing circuit parts Recheck power and installation condition Yes WARNING Before checking PCB or each outdoor electri...

Page 70: ...GND 5V_GND 5V_GND Comp_Current Comp_Current Comp_Current AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 CT Sensing Check Point GND GND GND COMP_U COMP_U COMP_U Black Red Vdc AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 ...

Page 71: ...G Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 U W V GND ...

Page 72: ...ndition 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 input Wire connectio...

Page 73: ...c All right reserved Only for training and service purposes LGE Internal Use Only AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 IGBT ...

Page 74: ... Only for training and service purposes LGE Internal Use Only Short Check Point Short Check Point AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 ...

Page 75: ...ned blocked Burned parts inside PCB IPM Burned PCB phase current sensing circuit parts Check compressor locking Compressor wire open short Check compressor insulation damage Check outdoor fan constraint screened flow structure Check if IMP burned refer to CH21 Check on PCB current sensing circuit parts Recheck power and installation condition Yes WARNING Before checking PCB or each outdoor electri...

Page 76: ...ked Refrigerant leakage insufficient 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 or each outdoor electric parts wait for 3 minutes after the power is off When measuring at sta...

Page 77: ...ed Open service valve Are communication cable piping normal Yes No Is amount of refrigerant normal refer refrigerant part 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 indoor outdoor unit LEV Check Indoor unit PCB Check indoor outdoor unit installation conditions Yes ...

Page 78: ...ween PFC Micom and INV Micom 1 Micom defect Circuit defect 2 Different Micom S W Version 3 ODU inverter PCB assembly damage Display code Title Cause of error Check point Normal condition n Error Diagnosis and Countermeasure Flow Chart Is Inverter PCB assembly normal No Replace inverter PCB assembly Is PFC Micom INV Micom S W Program normal No Upgrade Micom Program Yes Yes Recheck power and install...

Page 79: ...int Recheck power and installation condition Yes n Error Diagnosis and Countermeasure Flow Chart 40 C T Sensor Error Initial current error Malfunction of current detection circuit Open Short Check CT Sensor output voltage 2 5Vdc 5 Display code Title Cause of error Check point Normal condition WARNING Before checking PCB or each outdoor electric parts wait for 3 minutes after the power is off When ...

Page 80: ...or training and service purposes LGE Internal Use Only 5V_GND 5V_GND 5V_GND Comp_Current Comp_Current Comp_Current AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 ...

Page 81: ...es LGE Internal Use Only AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 CT Sensing Check Point 1 2 3 Vdc CT Sensing Check Point Inverter PCB GND GND GND I_CT I_CT I_CT Black Red Vdc ...

Page 82: ...pen Short Soldered poorly Internal circuit error 1 Bad connection of thermistor connector 2 Defect of thermistor connector Open Short 3 Defect of outdoor PCB Ω 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...

Page 83: ...ector Open Short Defect of connector PCB Open Short Defect of outdoor main PCB Is sensor connected to PCB 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 is the system also abnormal Is pressure sensor OK Check the value of pressure sensor Cf Output voltage is about 1 4V a...

Page 84: ...ck 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 If one indoor unit is operated normally outdoor PCB is no problem Check the another indoor unit CH05 is displayed at indoor unit CH53 is displayed ...

Page 85: ...ion 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 Yes MAIN PCB assembly normal No Replace MAIN PCB assembly Check Point Check the EEPROM Check sum Direction AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0...

Page 86: ...ht reserved Only for training and service purposes LGE Internal Use Only AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 EEPROM EEPROM ...

Page 87: ...nnector displaced poor EEV assembly 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 or each outdoor electric parts wait for 3 minutes after the power...

Page 88: ... is opened Eliminate causes for abnormal condition Check resistance Replace PCB if abnormality found Is assemble condition of INV PCB heatsink normal Is PCB temperature sensing part normal No No Yes Check assemble condition between INV PCB heatsink and PFC IPM module Reassemble if abnormality found Recheck installation condition and connection of Heat sink Yes Model check point Normal resistance A...

Page 89: ...ight reserved Only for training and service purposes LGE Internal Use Only AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 VSS VSS VSS VFO VFO ...

Page 90: ...or training and service purposes LGE Internal Use Only AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 Ω PFCM Measuring resistance between No 19 20 pin ...

Page 91: ...on Check resistance Replace PCB if abnormality found Is assemble condition of INV PCB heatsink normal Is PCB temperature sensing part normal No No Yes Check assemble condition between INV PCB heatsink and PFC IPM module Reassemble if abnormality found Recheck installation condition and connection of Heat sink Yes n Error Diagnosis and Countermeasure Flow Chart Model check point Normal resistance A...

Page 92: ...ight reserved Only for training and service purposes LGE Internal Use Only AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 VSS VSS VSS VFO VFO ...

Page 93: ...or training and service purposes LGE Internal Use Only AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 Ω PFCM Measuring resistance between No 19 20 pin ...

Page 94: ...king Reassemble 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 Inverter PCB if abnormality found Is wire connection of ODU Fan Motor wire normal No Yes Check wiring between OUD fan motor and Inverter PCB Check if Hall Senor and Motor output terminal color is matched Reassemble i...

Page 95: ...ing and service purposes LGE Internal Use Only AUUQ18GH1 AUUQ21GH1 AUUQ24GH1 ATUQ18GPLE3 ATUQ21GPLE3 ATUQ24GNLE3 AVUQ18GJLA0 AVUQ21GJLA0 AVUQ24GJLA0 ABUQ18GHLA0 ABUQ21GHLA0 ABUQ24GGLA0 ABUQ18GL2A0 ABUQ21GL2A0 ABUQ24GL3A0 Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor ...

Page 96: ...ervice purposes LGE Internal Use Only Main PCB AUUQ42GH1 AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor ...

Page 97: ...g Indoor Outdoor Unit 3 Check EEV 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 Rea...

Page 98: ...Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Input Power Source Check Point Main PCB wiring Check Point N N L N L Noise Filter wiring Check Point L N AUUQ36GH1 ATNQ36GMLE3 ABNQ36GGLA0 AVNQ36GKLA0 ...

Page 99: ... AUUQ48GH1 AUUQ54GH1 ATUQ42GMLE3 ATUQ48GMLE3 ATUQ54GMLE3 AVUQ42GLLA0 AVUQ48GLLA0 AVUQ54GLLA0 ABUQ42GRLA0 ABUQ48GRLA0 ABUQ54GRLA0 Copyright 2013 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 99 Part 4 Trouble Shooting ...

Page 100: ...P NO MFL67478303 June 2013 ...

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