LG ABNW70GB9A0 Svc Manual Download

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LGE Internal Use Only

4. Trouble Shooting

Items

Contents

Purpose

Securing the credibility of the compressor lifetime against the generation
of over-current at the compressor part in the DC Link Low Voltage
condition.

Condition for Generation Detected DC Link Voltage is less than the standard.

Expected

Causes

Installation

Installation fault and input of low-voltage power

PCB

Assembly

Damage of DC link voltage detection circuit and reactor terminal
connection error

6.6 Troubleshooting Outdoor Error

CH 23 (DC Link Voltage Low)

Summary of Contents for ABNW70GB9A0

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: ...Nomenclature 8 Part 2 Functions Controls 10 1 List of Functions Accessory 11 2 Installation Functions 13 3 Reliability 16 4 Convenience Functions Controls 17 5 Special Function KIT 25 Part 3 Basic Control 26 1 Normal operation 27 2 Compressor control 27 3 EEV Electronic Expansion Valve control 27 Part 4 Trouble Shooting 28 1 Self diagnosis Function 29 2 Pump Down 33 3 Evacuation 34 4 Gas Charging ...

Page 3: ... 3 Copyright 2014 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 8 Part 1 General Information ...

Page 4: ... cause death or severe injury if come in contact with it Do not touch the discharging refrigerant gas during the repair work The refrigerant gas can cause frostbite Release the refrigerant gas completely at a well ventilated place first Otherwise when the pipe is disconnected refrigerant gas or refrigerating machine oil discharges and it can cause injury When the refrigerant gas leaks during work ...

Page 5: ...cuum pump or Inert 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 explosion There is the risk of death injury fire or explosion Do not turn on the breaker or power under condition that front panel cabinet top cover control box cover are removed or opened Otherwise it may cause fire electric shock explosi...

Page 6: ...ge 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 user s 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 terminal block is not dirty or loose If terminal block is dust or loose it can cause an electrical sho...

Page 7: ...e ABNW85GB9A0 UB85 N94 ABNW70GB9A0 UB70 N94 Category Chassis Name Capacity Index kW kBtu h 23 0 85 20 0 70 Ceiling Concealed Duct High Static Pressure B9 ABNW85GB9A0 UB85 N94 ABNW70GB9A0 UB70 N94 2 2 Outdoor unit DC Inverter AUUW85LAE UU85W U74 AUUW70LAE UU70W U34 No of connectable indoor units 1 4 1 4 Total capacity index of connectable indoor units kW 23 0 20 0 Power supply 3Ø 380 415V 50Hz 3Ø 3...

Page 8: ...Only H Heat Pump W Inverter Heat Pump R410A Single A Outdoor Unit 3 2 Outdoor Unit Global 3 Nomenclature 3 1 Indoor Unit Global Serial number Function A Basic H High Efficiency Look Chassis name only for High Static Duct Chassis name Electrical rating G 220 240 50 60 1 Nominal Capacity Ex 85 000 Btu h Class 85 Model type W DC Inverter H P A N Indoor units using R410A Indicates Product type T Ceili...

Page 9: ...oduct type T Ceiling Cassette Air Conditioner B Ceiling Concealed Duct Air Conditioner V Ceiling Suspended Air Conditioner Connectable Outdoor unit type U Indoor units only for Single A systems Chassis name B U N 9 4 85 3 3 Indoor Unit Europe 3 4 Outdoor Unit Europe U U 8 5 W U7 4 Cooling capacity kBtu h Type U Outdoor units Model type U Universal model Model type Serial number Outdoor unit chassi...

Page 10: ...re Setting 13 3 Reliability 16 3 1 Hot start 16 3 2 Self diagnosis Function 16 3 3 Soft dry operation 16 4 Convenience Functions Controls 17 4 1 Cooling heating Operations 17 4 2 Auto changeover operation 18 4 3 Auto restart Opeartion 18 4 4 Child Lock Function 19 4 5 Forced operation 19 4 6 Group Control 20 4 7 Sleep Timer Operation 21 4 8 Timer On Off 21 4 9 Weekly Program 22 4 10 Two Thermistor...

Page 11: ...n cool heat 3 3 3 Chaos wind auto wind X Jet cool heat X X Swirl wind X Air purifying Triple filter Deodorizing X Plasma air purifier X Allergy Safe filter X Long life prefilter washable anti fungus O Installation Drain pump ABDP9 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 changeo...

Page 12: ...ntroller AC Ez AC Smart ll Option Kit SD card type ACP Advanced Control Platform AC Manager PI485 DO Digital Output Kit BNU Building Network Unit LONWORKS Gateway BACnet Gateway Installation Y branch Header branch Air Guide ODU Dry Contact Low Ambient Kit Note O Applied X Not applied Accessory model name Installed at field ordered and purchased separately by the corresponding model name supplied w...

Page 13: ...ch wind flow 6 Press button to exit 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 8 Function code ESP code ESP value 13 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 2 Functions Controls This is the...

Page 14: ...e desired setting value with the temperature up s down t button 2 When pressing button currently established static pressure value will be set up 3 When pressing the button and button simultaneously for more than 3 seconds after the setting has been completed the setting mode will be released If there isn t any button input for more than 25 seconds the installer setting mode will also be released ...

Page 15: ...W 64 MID 72 HIGH 80 Model Maximum value ABNW85GB9A0 UB85 N94 ABNW70GB9A0 UB70 N94 105 Model Factory set E S P mmAq Pa ABNW85GB9A0 UB85 N94 ABNW70GB9A0 UB70 N94 13 127 6 59 7 69 8 78 9 88 10 98 12 118 13 127 14 137 15 147 16 157 18 176 32 01 32 02 32 03 32 04 32 05 32 06 32 07 32 08 32 09 32 10 32 11 74 75 76 78 79 82 84 86 89 91 95 78 79 80 82 83 87 89 91 94 96 100 82 84 86 88 90 93 95 97 100 101 ...

Page 16: ...ooting guide 3 3 Soft dry operation When the dehumidification operation input by the remote control 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 dehumidif...

Page 17: ...tion The difference between the room temp and set temp frequency restrictions If compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 sec onds Condition of compressor turned off When intake air temperature reaches 4 C above the setting temperature Condition of compressor turned on When intake air temperature reaches 2 C above the setting temperatu...

Page 18: ...ng heating set temperature and fan speed The unit will memorize the above conditions and start with same memorized condition 4 2 Auto changeover operation The air conditioner changes the operation mode automatically to keep indoor temperature When room temperature vary over 2 C with respect to setting temperature air conditioner keeps the room tempera ture in 2 C with respect to setting temperatur...

Page 19: ...22 C 23 C 24 C Setting speed of indoor fan High speed Operating Mode Cooling Healthy Dehumidification Heating It is the function to use preventing children or others from careless using Press button repeatedly until the is flashing 1 If moving to setup icon area by using button setup icon blinks and child lock function is setup if pressing button at that time 2 When cancelling lock function if mov...

Page 20: ...nication function with one remote 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 OFF and then ON 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 ch...

Page 21: ...er mode is input while in heating cycle mode the airflow speed of the indoor fan is set to the medi um 4 8 Timer On Off 4 8 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 22: ...y reservation by using button 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 setu...

Page 23: ...Weekly 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 ...

Page 24: ...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 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 temperature Temperature sen...

Page 25: ... cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid back is prevented by reducing outdoor fan speed It can prevent frosting of evaporator and keep cooling operation 7 Special Function KIT T2 C T1 C Outdoor pipe Outdoor Fan Speed Setting Speed Off Off Setting Speed Setting Speed Part 2 Functions Controls ...

Page 26: ...ectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 3 Basic Control Part 3 Basic Control 1 Normal operation 27 2 Compressor control 27 3 EEV Electronic Expansion Valve control 27 ...

Page 27: ...trol 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 superheat 2 3 or the target temperature of discharge pipe Cooling mode...

Page 28: ...ndicator Indoor 29 1 2 Error Indicator Outdoor 30 2 Pump Down 33 3 Evacuation 34 4 Gas Charging 35 5 Cycle Part 36 6 Electronic Parts 37 6 1 The Product does n t operate at all 37 6 2 The Product doesn t operate with the remote controller 38 6 3 The Compressor Outdoor Fan are don t operate 39 6 4 When indoor Fan does not operate 40 6 5 Troubleshooting Indoor Error 41 6 6 Troubleshooting Outdoor Er...

Page 29: ...r temperature sensor of indoor unit is open or short 2 Inlet pipe temperature Sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short 3 Communication error wired remote controller indoor unit Failing to receive wired remote controller signal in indoor unit PCB 4 Drain pump Malfunction of drain pump 5 Communication error outdoor unit indoor unit Failing to receive outdoo...

Page 30: ...nc All right reserved Only for training and service purposes LGE Internal Use Only 1 2 Error Indicator Outdoor Outdoor Error Ex CH21 IGBTM Fault Error 7 Segment 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 1 Sec 2 Sec 2 Sec 1 Sec 1 Sec LED01G RED LED02G GREEN ...

Page 31: ...26 DC Comp Position Detection Error Stop CH26 Flashing 2 times Flashing 6 times 27 PSC PFC Over Current Error HW Stop CH27 Flashing 2 times Flashing 7 times 29 Comp Phase Over Current Error Stop CH29 Flashing 2 times Flashing 9 times 32 D Pipe Overheating Error INV Comp Stop CH32 Flashing 3 times Flashing 2 times 40 Outdoor Unit Inverter Compressor CT Sensor Fault Stop CH40 Flashing 4 times 41 D P...

Page 32: ...evice Stop CH53 Flashing 5 times Flashing 3 times 54 Open and Reverse Phase Error Stop CH54 Flashing 5 times Flashing 4 times 60 EEPROM Check Sum Error Stop CH60 Flashing 6 times 61 Outdoor Device Pipe Overheating Error Stop CH61 Flashing 6 times Flashing 1 time 62 Heat sink Overheating Error Stop CH62 Flashing 6 times Flashing 2 times 65 Heat sink Sensor Error Stop CH65 Flashing 6 times Flashing ...

Page 33: ...alve only after green LED turned off 7 minutes from the start of the machine Then close the gas valve after Green LED on WARNING When the green LED of PCB is on compressor 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...

Page 34: ...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 35: ...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 valve s service port Stopping partway will allow the gas to be discharged If the system has been charged with liquid refrig e...

Page 36: ...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 cm2 G Cooling at normal condition R410A 2 The temperat...

Page 37: ...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 38: ...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 39: ...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 40: ... off main power Check the connection of CN FAN Check the Fan Motor Check the Fuse 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 of CN...

Page 41: ...1 Indoor unit PCB wrong connection 2 Indoor unit PCB failure 3 Sensor problem main reason In case the value is more than 100kΩ open or less than 100Ω short Error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin Normal Air temp sensor 10 C 20 7kΩ 25 C 10kΩ 50 C 3 4kΩ Pipe temp sensor 10 C 10kΩ 25 C 5kΩ ...

Page 42: ...dressing input unit s address if connected to central controller All the indoor units connected should be turned on before Auto Addressing 03 No communication 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 f...

Page 43: ...OJU 130 FSSPS SSPS PDDVS JO 130 PG UIF OEPPS 1 SSPS EFWFMPQFE JO DPNNVOJDBUJPO CFUXFFO UIF NJDSP QSPDFTTPS BOE UIF 130 PO UIF TVSGBDF PG UIF 1 3303 EVF UP UIF 130 EBNBHF SSPS EJBHOPTJT BOE DPVOUFSNFBTVSF GMPX DIBSU 3FQMBDF UIF JOEPPS VOJU 1 BOE UIFO NBLF TVSF UP QFSGPSN VUP BEESFTTJOH BOE JOQVU UIF BEESFTT PG DFOUSBM DPOUSPM 6 5 Troubleshooting Indoor Error CH 09 Indoor unit EEPROM error ...

Page 44: ...otor 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 kΩ hundreds kΩ hundreds kΩ hundreds kΩ TD chassis Normal resistance 10 Replace the indoor unit PCB and then make sure to d...

Page 45: ...tdoor fan fault EEV Electric Expansion Valve fault fault of a temperature sensor or its con nection blocking of an indoor device filter and bending blocking of a pipe Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the pipe or panel damage of compressor with abrasion and compressor connection fault PCB As sembly IGBTM part fault fault ...

Page 46: ...M connection state Checking power connection state Checking outdoor fan operating condition Checking sensor fault Checking Compressor phase resistance Checking single unit of IGBTM Checking pipes For bending blocking Checking 4 way valve Checking compressor Insulation resistance Checking Compressor current detection circuit Checking EEV for motion Checking DC link voltage 3 phase power source Chec...

Page 47: ...hanger and obstacles in the surrounding Frequent turning off of the compressor Elevation of the pipe temperature due to reduced wind velocity ơ Wrong influence to the system in over load state Corrosion Possible infiltration of moisture highly humid area Corrosion of heat exchanger ơ Reduced opera tion efficiency ơ Transfer of troubles to other parts Ɯ When the front back has a wall 1 side Ɯ When ...

Page 48: ...igerant Frequent turning on off of the compressor by the high low pressure protection logic Accumulated refrigerant elevates the tem perature and reduces the pressure Wrong oil collection elevates the outlet tem perature of the compressor and damages the compressor Bending Blocking of a pipe Checking SVC Valve Bending of a pipe Check pipes SVC Valve Check EEV Check Replacing a part of or the entir...

Page 49: ...re 2 Power on for 12 hours or less 1 The compressor stops and same error appears again 2 If output voltage of the inverter is stably output Note 1 3 If output voltage of the inverter is unstable or it is 0V When incapable of using a digi tal tester Go to No 2 Go to No 2 after applying power for designated time 12 hours Check IGBTM may fail Check coil resistor and insulation resistor If normal rest...

Page 50: ...f insulation resistance between the compressor and panel 2 Measurement of phase resistance 3 Wiring Check ƅ How to check the compressor wiring error W U U V W V W W W U U U U U U V V V W W W Compressor Inverter PCB V V V 1 Check Inv PCB U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reassemble if abnormality f...

Page 51: ... right side tables 2 Check insulation resistance between compressor terminal and pipe over 50m Replace compressor if abnormality found Are there any power wire connections normal No Yes 1 Check R S T N Wiring Condition Rewire them if abnormality found Is Inv PCB normal No Check Inv PCB IGBTM normality Refer to P 53 Replace Comp PCB assembly if abnormality found Is compressor Wire connection condit...

Page 52: ...mality Ex W ƥ P Ex R ƥ P Ex R ƥ N Ex W ƥ N Check Inv PCB Bridge Diode normality Tester Mode Check Point Result Action Resistor P U P V P W 0 Ω Short or Hundreds MΩ Open Replace Inv PCB U N V N W N Diode P U P V P W 0 4 V 0 6 V U N V N W N Tester Mode Check Point Result Action Resistor P L1 P L2 P L3 0 Ω Short or Hundreds MΩ Open Replace Inv PCB L1 N L2 N L3 N Diode P L1 P L2 P L3 0 4 V 0 6 V L1 N ...

Page 53: ...me to start heating mode operation and at the time of standby after operation Ɯ Checking the output voltage of CN 4way refer to next page Ɯ Check the 4 way valve coil resistance 1 Set the tester in AC Voltage Mode and check the current 2 Check the output voltage between both ends of CN 4Way Connector 3 The standard of normal voltage is 220V 10 4 If the measurement is different from the standard re...

Page 55: ... 55 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting LGMV Display 8IFO FBUJOH UVSO PO 8IFO PPMJOH UVSO PGG ...

Page 56: ...EEV for 17 sec If LEDs do not turn on or are in on state continuously then driving circuit is abnormal Check and replace outdoor unit control board EEV locking 1 If EEV is locked in no load state the driving motor rotate and clicking sound always occurs Replace EEV EEV Motor coil short or misconnection 1 Check the resistance between coil terminal red white red yellow red orange red blue 2 If the e...

Page 57: ...S T N wiring conditions Rewire them if abnormality found Is Inv PCB normal No Check Inv PCB IGBTM normality Check Inv PCB IGBTM normality Refer to P 53 Replace Comp PCB assembly if abnormality found Is bridge diode normal No 1 Check joining condition of bridge diode and heatsink 2 Check bridge diode joining again or replacing bridge diode if abnormality found Yes Yes Is Inv PCB bridge diode joinin...

Page 58: ...right 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting Check DC_Link Connector joining condition Measuring input voltage S R Q չ ո ...

Page 59: ...allation Overload Installation fault closing of SVC valve under over charging with refriger ant infiltration of water into refrigerant outdoor device shielding outdoor fan fault EEV valve fault and sensor fault or assembling error Compressor Short between compressor coil and sash abrasion of compressor and short opening of compressor coil PCB Assembly Input current detection circuit fault Others I...

Page 60: ... 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 Inv PCB normal No Check Inv PCB IGBTM normality Replace Inv PCB Are the resistance Between each phase and insulation resistance of Inverter compressor normal No 1 Check resistance between each terminal of...

Page 61: ...cs Inc All right reserved Only for training and service purposes LGE Internal Use Only Measuring resistance between each terminal of compressor Compressor wire connector connection Measuring input voltage Check DC_Link Connector joining condition T S R չ ո ...

Page 62: ...me against the generation of over current at the compressor part in the DC Link Low Voltage condition Condition for Generation Detected DC Link Voltage is less than the standard Expected Causes Installation Installation fault and input of low voltage power PCB Assembly Damage of DC link voltage detection circuit and reactor terminal connection error 6 6 Troubleshooting Outdoor Error CH 23 DC Link ...

Page 63: ...conditions Rewire them if abnormality found Is Inv PCB normal No Check Inv PCB IGBTM normality Check Inv PCB IGBTM normality Refer to P 53 Replace Comp PCB assembly if abnormality found Is bridge diode normal No 1 Check joining condition of bridge diode and heatsink 2 Check bridge diode joining again or replacing bridge diode if abnormality found Yes Yes Is Inv PCB bridge diode joining condition n...

Page 64: ...Trouble Shooting 64 Copyright 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Check DC_Link Connector joining condition Measuring input voltage S R Q չ ո ...

Page 65: ...ck power and installation condition Yes Are there any power wire connections normal No Yes 1 Check R S T N wiring conditions Rewire them if abnormality found 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 Is Inv PCB bridge diode joining condition normal No Check joining condition ...

Page 66: ...allation Overload Closing of SVC valve under over charging with refrigerant infiltration of water into refrigerant outdoor device shielding outdoor fan fault EEV valve fault and sensor fault or assembling error Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the sash damage of compressor with abrasion and compressor connection fault PC...

Page 67: ...o the right side tables 2 Check insulation resistance between compressor terminal and pipe over 50m Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes No Yes 1 Check Inv PCB U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact ...

Page 68: ...t 2014 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting Measuring resistance between each terminal of compressor Compressor wire connection ...

Page 69: ... Overload Transfer of signals with detection of the flow of over current in PSC PFC Outdoor device shielding Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the sash damage of compressor with abrasion and compressor connection fault PCB Assembly Damage of PSCM PFCM and input current detection circuit fault Others Input of abnormal powe...

Page 70: ... for over shorts Checking compressor wiring Checking power connection state Checking reactor Terminal connection Checking outdoor fan operation Checking compressor phase resistance Checking pipes for Bending blocking Checking compressor insulation resistance Checking EEV for motion Check for AC190 260V Check the reactor terminal insertion state Manifold gauge Flow of trouble diagnosis Distance bet...

Page 71: ...on Overload Transfer of signals with detection of the flow of over current in PSC PFC blocking of a outdoor unit Compressor Open Short of the coil in the compressor insulation breaking between the coil in the compressor and the sash damage of compressor with abrasion and compressor connection fault PCB Assembly Compressor current detection circuit fault DC link detection circuit fault and fault of...

Page 72: ...ssor normal No Yes 1 Check resistance between each terminal of compressor Refer to the right side tables 2 Check insulation resistance between compressor terminal and pipe over 50m Replace compressor if abnormality found Is compressor Wire connection condition normal No Yes 1 Check Inv PCB U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connec...

Page 73: ...ectronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting Measuring resistance between each terminal of compressor Compressor wire connection Measuring input voltage ...

Page 74: ...levated exceeding the standard Expected Causes Installation Installation fault closing of SVC valve under over charging with refriger ant and infiltration of moisture into refrigerant Overload Outdoor device shielding outdoor fan fault and EEV valve fault Compressor Short between compressor coil and sash abrasion of compressor and short opening of compressor coil PCB Assembly Compressor current an...

Page 75: ...ing input voltage Checking outdoor devices for shielding Checking under over charging with refrigerant Checking compressor wiring Checking outdoor fan operation Checking compressor phase resistance Checking pipe blocking Checking compressor insulation resistance Checking the work of EEV Check for AC190 260V Refer to manifold gauge Flow of trouble diagnosis Checking outdoor Temperature sensor 6 6 T...

Page 76: ...1 Input voltage abnormal T N 2 ODU Inv 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 Inv PCB assembly normal No Yes Replace Inv PCB assembly Measuring input vo...

Page 77: ... from the tempera ture sensor Condition for GenerationDamage of temperature sensor Short Open Condition for Generation Classiﬁcation Causes in Detail PCB Assembly Connector open damaged insulation of sash damage of the wire coat ing of temperature sensors Code No Details of Errors 41 Inverter Discharge temperature sensor Open Short 43 High pressure Sensor Error 44 Outdoor air temperature sensor Op...

Page 78: ...he unique resistance by sensor temperature Position Outlet of compressor Sensor value 200kΩ 10 Based on 25 Position Rear part of outdoor device Sensor value 10kΩ 10 Based on 25 Position Compressor inlet and pipe Sensor value 5kΩ 10 Based on 25 ڸ Compressor discharge sensor ں Outdoor temperature sensor ڹ Pipe sensor 200 Ω 5 Ω 5 Ω Compressor inlet sensor Pipe sensor 10 Ω Sensor Checking Methods 6 6 ...

Page 79: ...BUVSF 1PTJUJPO 0VUMFU PG XBZ WBMWF CBTFE PO DPPMJOH NPEF ⴛ Pressure sensor After power supplied the pressure on LGMV is normal before operating Voltage of 5V is output from the PCB The location and connection of connector is normal on PCB PCB checking and replacement Reconnection Replace the pressure sensor Checking start No malfunction of the pressure sensor Yes Yes Yes No No No 6 6 Troubleshooti...

Page 80: ...urce interfering with communication 3FTFUUJOH QPXFS TPVSDF 8BJU GPS NJOVUFT BGUFS UVSOJOH UIF QPXFS PG UIF QSPEVDU PGG Items for checking Sub items for checking Resetting power source Connector Insufficient insertion of housing Damage of wire coating Check the Heat sink and Chassis Panel Checking power source LED Off Damage of wire coating Replacement of inverter PCB Replacement of main PCB Ⲽ U TI...

Page 81: ...vironment interfering PCB communication OK NG 6 6 Troubleshooting Outdoor Error CH 52 PCB Communication Error Main PCB Communication wire Inv PCB Are there any communication wire connections normal Is Inv PCB assembly normal Is there any error when power reset Recheck power and installation condition 1 Check communication wiring conditions 2 Check connector conditions Rewire them if abnormality fo...

Page 82: ...oduct off Items for checking Sub items for checking Resetting power source Outdoor PCB Installation Replacing indoor PCB Check LGMV Communication rate Grounding Wire tongue termination Communication cable length No power Insert Connector Wire connection state Communication cable length Checking for LED Off Normal Operation If length is 50m over Please separate communication wire Damage and install...

Page 83: ...eck reactor connection state ڹ Check fuse state ں Check whether outdoor PCB LED is lighted Purpose Checking whether outdoor PCB is normal Items for checking Lighting of LED fuse damage and reactor connection error Checking Method of Outdoor PCB 6 6 Troubleshooting Outdoor Error CH 05 53 Indoor Outdoor Device Communication Error Detection by indoor devices ...

Page 84: ...ed by wire to wire ethod In case of additional connection connect the wires with soldering as shown below ⴙ Wire tongue termination fault ⴚ The cut section of the wire passes the insulation tape and causes a short with another wire ⴛ Communication noise by oxidized wire arrangement Soldering is required Wire to Wire Neutral Neutral OTUBMMBUJPO FOWJSPONFOU JOUFSGFSJOH XJUI UIF DPNNVOJDBUJPO PG JOEP...

Page 85: ...WPMUBHFT IFDL SFTJTUBODF PNNVOJDBUJPO JWF TIPVME CF JOGJOJUF IFDL SFTJTUBODF PNNVOJDBUJPO FUVSBM TIPVME CF JOGJOJUF IFDL SFTJTUBODF PNNVOJDBUJPO OE TIPVME CF JOGJOJUF 8IFO OQVU 7 IFDL 7 JWF FUVSBM OEPPS 0VUEPPS 0UIFSXJTF BSSBOHF UIF PNNVOJDBUJPO 8JSF IFDL 7 RVJQNFOU VMUJ FUFS 5FTU PEF 7PMUBHF OEPPS 0VUEPPS 5FSNJOBM CMPDL RVJQNFOU VMUJ FUFS 5FTU PEF 3FTJTUBODF IFDL 7PMUBHF OQVU PG 7 O P J U B D J O...

Page 86: ...F PNNVOJDBUJPO JOF BOE 1JQF GUFS 3FNPWJOH 1PXFS JOF 8JSF BOE PNNVOJDBUJPO JOF 8JSF IFDL UIF WPMUBHFT IFDL OGJOJUF 3FTJTUBODF CFUXFFO 1PXFS PNNVOJDBUJPO JOF BOE 1JQF JOF N L Gnd 皻柦 Ω Pipe N L Gnd 皻柦 Ω Pipe Check Resistance and Pipe Line Check Resistance Live and Pipe Check Resistance Neutral and Pipe N L Gnd 皻柦 Ω Pipe Check Resistance Communication Line and Pipe ...

Page 87: ...s Inc All right reserved Only for training and service purposes LGE Internal Use Only 4 Check the condition of N wire connection If N phase wiring is bad correct the N phase wire and check the generation of CH53 one more N phase wire ...

Page 88: ...l right reserved Only for training and service purposes LGE Internal Use Only PNNVOJDBUJPO SBUF PSNBMMZ IFDL 7 PNNVOJDBUJPO SBUF 6 6 Troubleshooting Outdoor Error CH 05 53 Indoor Outdoor Device Communication Error Detection by indoor devices ...

Page 89: ...us are not on or not blinking in outdoor inverter PCBA 2 Causes Noise disturb the outdoor unit communication with indoor unit 3 Improvement Inserting small connector with capacitor in Inverter PCBA of Outdoor Unit 1 Connector can be applied to the list PCBA P No on the next page 2 Guide where you put it on the next page It helps outdoor unit communicate with indoor unit better than before and redu...

Page 90: ...4 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part 4 Trouble Shooting Phenomenon PCBA P NO 1 Red LED off 2 Red LED turn on but not blinking EBR79182301 EBR78088701 ...

Page 91: ...pressor Condition for Generation Resetting power source Wait for 3 minutes after turning the power of the product off Items for checking Sub items for checking Installation Checking N phase Checking for open and reverse phase Fuse damage R and S phases AC load Inverter PCB Checking for power phase loss Refer to 111 page Refer to 112 page Refer to 112 page Main power wiring fault 6 6 Troubleshootin...

Page 92: ...F QBUUFSO ᐮ ᐭ R S T N R S T N R S T N R S T N R S T N R S T N 380 Vac 380 Vac N phase 380 Vac 220 Vac N phase ᐯ ᐰ N phase unavaila ble N phase unavaila ble N phase unavaila ble N phase availab le ᐯ ᐰ R S T N R S T N R S T N R S T N R S T N R S T N 220 Vac 220 Vac N phase 220 380 Vac N phase N phase availa ble N phase availa ble Vac N phase availa ble N phase unavaila ble 6 6 Troubleshooting Outdoo...

Page 93: ...hat does not generate voltage was upgraded Power module requires checking Operation with replacement of R and S phases only Black White Red blue Black White Red blue Black White Red blue Black White Red blue R S T N R S T N R S T N R S T N Vac Vac Vac Vac Vac Vac Judgment Method of R S T phase loss Judgment method of open and reverse phase of R S T R S T N 6 6 Troubleshooting Outdoor Error CH 54 O...

Page 94: ...GPS NJOVUFT BGUFS UVSOJOH UIF QPXFS PG UIF QSPEVDU PGG How to check the EEPROM assembling state of outdoor devices ⴘ IFDL UIF EJSFDUJPO PG 130 4IBQF PG NBSLJOH MJOF BOE EJSFDUJPO PG 130 ⴙ IFDL XIFUIFS 130 JT QFSGFDUMZ BEIFSFE ⴚ IFDL XIFUIFS 130 MFBE JT QVU PVU PG UIF PVUMFU Items for checking EEPROM IC containing the operation data suitable to the product Sub items for checking Power Source Prompt...

Page 96: ...r to start defrosting Shielding environment cycle disorder and sensor unit fault Resetting power source Wait for 3 minutes after turning the power of the product off Installation Cycle Sensor Replacing PCB Whether to shield Pipe blocking Properties of unit Checking service valve for opening Checking EEV for proper working Checking refrigerant for leakage or overcharging Checking fan for working 6 ...

Page 97: ...r Indoor Unit 3 Check EEV Connector Assemble Condition Normal Operation 4 Check Refrigerant Pressure 5 Check Power Wire Connection Condition Reassemble or Manage if abnormality Found 1 Check Inv PCB Screw Connection Condition Reassemble or Manage if abnormality Found No Inv PCB IGBTM Connection Condition Normal Yes 1 Check Outdoor Unit Fan Motor Operation or Lock Reassemble or Manage if abnormalit...

Page 98: ...V at initial state of power supply 1 Input Voltage is abnormal T N 2 ODU Inv PCB damage CT sensing part Are there any power wire Connections normal No 1 Check R S T N wiring conditions 2 Check noise filer wiring conditions Rewire them if abnormality found Check R S S T T R phase voltage 380V 10 R N S N T N phase voltage 200V 10 Check connection condition and wiring if power is abnormal No Is input...

Page 99: ...P NO MFL67478319 February 2015 ...

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