LG Checkpoint-codes. Versie 2.4P-M vervangt U02.3.M

Transcription

1 LG LG Checkpoint-s Versie 2.4P-M vervangt U02.3.M BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THE SERVICEMANUAL. ONLY FOR AUTHORIZED SERVICE PERSONNEL. 1

2 Hoofdstukindeling Single A (vloer- & plafond UV / cassette UT / kanaal UB) Aan / Uit - Inverter UU..(W) - Variabel (aan/uit)...26 AT-C.. / AT-H.. / LB-C.. / LB-D.. / LB-G.. / LB-H.. / LT-B.. / LT-C.. / LT-D.. / LT-E.. / LV-B.. / P..AH Multi-split Inverter FM..AH - Variabel (aan/uit)...92 M..AC/AH 2

3 - Multi-split tot A2-C.. / A3-C.. / A2-H.. / A3-H.. / LM.. RAC Standaard wandunit (aan/uit)...97 LS-J.. / LS-K.. / LS-L.. / S..ACL / S..ACP / S..AH(P) / G..AH - ART COOL Deluxe / Panel (aan/uit)...97 LS-P.. / A09AH* / -12- / -18- / C07AH* / -09- / Standaard wandunit Inverter...99 LS-N.. / LS-Q.. / LS-R.. / S..AN / S..AW - ART COOL Deluxe Inverter C09AW* / C12AW* - ART COOL Deluxe Inverter C18AW* / C24AW* -ART COOL Panel Inverter A09AW* / A12AW* / A09AW1 / A12AW1 3

4 LG Single A (vloer- & plafond UV / cassette UT / UB kanaal) UU..(W) Inverter 1-fase (single-split) Inverter 3-fase (Single-split) Synchro (master/slave) Variabel (aan/uit, single-split) 4

5 6.6 Check Trouble shooting CH01, CH02, CH06 5. Trouble Shooting Title Cause of error Check point & rmal condition 01 Indoor air sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 10KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C(Plugged) Refer to sensor resistance table. 02 Indoor inlet pipe sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 5KΩ/ at 25 C(Unplugged) rmal voltage : 2.5Vdc / at 25 C(Plugged) Refer to sensor resistance table. 06 Indoor outlet pipe sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 5KΩ/ at 25 C(Unplugged) rmal voltage : 2.5Vdc / at 25 C(Plugged) Refer to sensor resistance table. Check Flow Chart Unplug the sensor on Indoor unit PCB Estimate the Voltage of each sensor. Check the Connector connection Is the voltage of the sensor 2.5Vdc at 25 C Correct connection Is it normal? Correct connection Repair or Change the PCB. Unplugged Plugged Estimate the resistance of each sensor. Is the resistance of the sensor 10Ω / 5kΩ at 25 C? Correct connection 10kΩ Ω 2.5Vdc V Plug the sensor on Indoor unit PCB Check the resistance Check the voltage 5

6 5. Trouble Shooting 6.7 Check Trouble shooting CH03 Title Cause of error Check point & rmal condition 03 Communication Error (Wired remote controller) Connector connection error Faulty PCB / Remote controller Connection wire break Connection of wire Main PCB Volt. DC12V ise interference Check Flow Chart Check the wire connection(open / Short / Miswirring) CN-REMO Is it normal? Correct connection Or change connection wire Is the soldering state of connector is normal? Check the volt. of main PCB power source. (DC 12V,DC 5V) Re-soldering component Or change the PCB Wired R/C S 12V GND (YL) (RD) (BR) Indoor Unit 12V S GND (RD) (YL) (BR) Is it normal? Check the installation of wired remote controller. (ise interference) Correct connection Or change the PCB 12Vdc V 12Vdc V Is it normal? Adjust the state of installation Check the Volt. Check the Volt. Copyright 2008 LG Electronics. Inc. All right reserved

7 6.8 Check Trouble shooting CH04 5. Trouble Shooting 04 Title Cause of error Check point & rmal condition Drain pump / Float switch Float switch open. (rmal : short) Water over flow The connection of wire (Drain pump/ Float switch) Drain pump power input. (220V) Drain tube installation. Indoor unit installation. (Inclination) Check Flow Chart Check the level of water (Float moves top position) Is it normal? Check Drain Pump CN-Float CN-Float Is the float switch clean? Clean float switch Drain pump check Check the wire connection (Open, Soldered poorly) Is it normal? Is the resistance of f loat switch normal (short)? Correct connection Or re-soldering PCB Change the float switch Check the wire connection (Open, Soldered poorly) Is it normal? Is the resistance of Drain Pump? rmal ( about 400Ω )? Correct connection Or re-soldering PCB Change the Drain Pump Is the drain pump clean? Clean drain pump Check drain tube installation Copyright 2008 LG Electronics. Inc. All right reserved

8 5. Trouble Shooting 6.9 Check Trouble shooting CH09, CH10 Title Cause of error Check point & rmal condition 09 EEPROM Check sum (Indoor) Check sum error Check the poor soldering. Change PCB 10 BLDC motor fan lock (Indoor) Fan motor break down Fan motor & PCB poor contact Obstruction to the fan Check the indoor fan motor. Check the connection status between PCB and fan motor. Check Flow Chart Check the indoor fan motor. (Fan is locked by obstruction) Is it normal? Remove obstruction Check the connection status between PCB and fan motor Is it normal? Correct connection Or re-soldering PCB Check the DC Motor signal Is it normal? Change Indoor Motor Copyright 2008 LG Electronics. Inc. All right reserved

9 6.10 Check Trouble shooting CH05, CH53 5. Trouble Shooting 05 / 53 Title Cause of error Check point & rmal condition Communication (Indoor Outdoor) The connector for transmission is disconnected. The connecting wires are misconnected. The communication line is break Outdoor PCB is abnormal. Indoor PCB is abnormal. Check power input AC 230V. (Outdoor, Indoor) Check connector for transmission Check wires are misconnecting. Check transmission circuit of outdoor PCB Check transmission circuit of indoor PCB Check Flow Chart Check the input power AC230V (Outdoor, Indoor unit) Is the connection of GND,GND1,GND2, correctly connected? Correct connection Is it normal? ( 230V ±10% ) Needs electric work Change PCB Check the communication wires are correctly connected. Is it normal? Check the resistance between communication line and GND. (rmal : Over 2MΩ) Adjust the connection of wire Confirm the wire of "Live", "Neutral", "Signal" Is it normal? Is connector for communication correctly connected? Correct connection CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit. Copyright 2008 LG Electronics. Inc. All right reserved

10 5. Trouble Shooting 6.11 Check Trouble shooting CH21 Title Cause of error Check point & rmal condition 21 DC Peak Instant over current Over Rated current Poor insulation of IPM An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W Over load condition - Overcharging of refrigerant - Pipe length. Poor insulation of compressor Check Flow Chart Check the wire connection.(u,v,w) Is it normal? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Needs electric work Is it normal? Check the resistance of comp. ( difference at each terminal) Is it normal? Check the electricity leakageof the compressor. (Refer to comp check table) Correct connection Change Compressor Check DC link capacitor Is it normal? (Refer to belows) Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked Change Main PCB Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant Is it normal? Check the input power (Outdoor, Indoor unit) Change Compressor Dc link voltage table DC Link Voltage Model Type n operating Operating 1 Phase AUUW126C PSC DC300V 10% DC280V 10% AUUW186C PSC DC300V 10% DC280V 10% AUUW246D PFC DC300V 10% DC380V 10% AUUW306D PFC DC300V 10% DC380V 10% AUUW366D PFC DC300V 10% DC380V 10% AUUW426D PFC DC300V 10% DC380V 10% AUUW486D PFC DC300V 10% DC380V 10% AUUW606D PFC DC300V 10% DC380V 10% 3 Phase AUUW368D PSC DC540V 10% DC500V 10% AUUW428D PFC DC540V 10% DC680V 10% AUUW488D PFC DC540V 10% DC680V 10% AUUW608D PFC DC540V 10% DC680V 10% Copyright 2008 LG Electronics. Inc. All right reserved

11 5. Trouble Shooting 6.12 Check Trouble shooting CH22 Title Cause of error Check point & rmal condition 22 Max. C/T Over current Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked, Check Flow Chart Check the wire connection.(u,v,w) Is it normal? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Needs electric work Is it normal? Check the resistance of comp. ( difference at each terminal) Is it normal? Check the electricity leakageof the compressor. (Refer to comp check table) Correct connection Change Compressor Check DC link capacitor Is it normal? (Refer to belows) Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked Change Main PCB Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant Is it normal? Check the input power (Outdoor, Indoor unit) Change Compressor Dc link voltage table DC Link Voltage Model Type n operating Operating 1 Phase AUUW126C PSC DC300V 10% DC280V 10% AUUW186C PSC DC300V 10% DC280V 10% AUUW246D PFC DC300V 10% DC380V 10% AUUW306D PFC DC300V 10% DC380V 10% AUUW366D PFC DC300V 10% DC380V 10% AUUW426D PFC DC300V 10% DC380V 10% AUUW486D PFC DC300V 10% DC380V 10% AUUW606D PFC DC300V 10% DC380V 10% 3 Phase AUUW368D PSC DC540V 10% DC500V 10% AUUW428D PFC DC540V 10% DC680V 10% AUUW488D PFC DC540V 10% DC680V 10% AUUW608D PFC DC540V 10% DC680V 10% Copyright 2008 LG Electronics. Inc. All right reserved

12 5. Trouble Shooting 6.13 Check Trouble shooting CH40 Title Cause of error Check point & rmal condition 40 C/T Internal circuit Initial current error Malfunction of current detection circuit. (Open / Short) The voltage of C01N Is 4.0Vdc (25A). Check Flow Chart Check the input power AC230V (Outdoor, Indoor unit) Is it normal? ( 230V±10%) Correct connection TRANS Check C01N Is it normal (4.0Vdc )? Change Main PCB C01N Check Check TRANS Is it normal? Change TRANS Change main PCB V Copyright 2008 LG Electronics. Inc. All right reserved

13 6.14 Check Trouble shooting CH23, CH28 5. Trouble Shooting 23 Title Cause of error Check point & rmal condition DC Link Low voltage. 1ph : DC link volt. is 140Vdc. 3ph : DC link volt. is 250Vdc. Check the power source. Check the components. 28 DC Link High voltage 1ph : DC link volt. is 140Vdc. 3ph : DC link volt. is 250Vdc. Check the power source. Check the components. 25 Input voltage Abnormal Input voltage (140Vac, 300Vac ) Check the power source. Check the components. Check Flow Chart Check DC link voltage Check the wire connection.(u,v,w) V Is it normal? Correct connection Check TRANS1 Is it normal? Is it normal? Check the input power Change Compressor Change Compressor Dc link voltage table CN_TRANS 1 DC Link Voltage Model Type n operating Operating 1 Phase AUUW126C PSC DC300V 10% DC280V 10% AUUW186C PSC DC300V 10% DC280V 10% AUUW246D PFC DC300V 10% DC380V 10% AUUW306D PFC DC300V 10% DC380V 10% AUUW366D PFC DC300V 10% DC380V 10% AUUW426D PFC DC300V 10% DC380V 10% AUUW486D PFC DC300V 10% DC380V 10% AUUW606D PFC DC300V 10% DC380V 10% 3 Phase AUUW368D PSC DC540V 10% DC500V 10% AUUW428D PFC DC540V 10% DC680V 10% AUUW488D PFC DC540V 10% DC680V 10% AUUW608D PFC DC540V 10% DC680V 10% Copyright 2008 LG Electronics. Inc. All right reserved

14 5. Trouble Shooting 6.15 Check Trouble shooting CH24 Title Cause of error Check point & rmal condition 24 Press S/W Open Low / High press S/W open. Check the connection of CN_PRESS Check the SVC V/V open. Check the leakage of refrigerant. Check Flow Chart Is the wire connection normal? Is the soldering state of connector is normal? Is the SVC Valve opened? Check the leakage of refrigerant. Check Pressure of suction pipe Check Pressure of discharge pipe Correct connection Re-soldering component Open SVC Valve Pressure switch table Switch Low pressure switch High pressure switch Spec 0.03 Mpa 4.3 Mpa Model AUUW126C AUUW246D AUUW186C AUUW306D AUUW366D AUUW426D AUUW486D AUUW606D AUUW368D AUUW428D AUUW488D AUUW608D CN_PRESS Is it normal? Change main PCB Re-vaccuming system & Re-charging Copyright 2008 LG Electronics. Inc. All right reserved

15 5. Trouble Shooting 6.16 Check Trouble shooting CH26, CH27 Title Cause of error Check point & rmal condition 26 DC Compressor Position Compressor position detect error Check the connection of comp wire U,V,W Malfunction of compressor Check the component of IPM, detection parts. 27 PSC Fault PFC Fault Over current at IGBT /PFC module Check the component of IGBT /PFC module. Check the components. Check Flow Chart Check the wire connection.(u,v,w) Is it normal? (1 Ph : 230V ±10% 3 Ph : 400V ±10% ) Needs electric work Is it normal? Check the resistance of comp. ( difference at each terminal) Is it normal? Check the electricity leakageof the compressor. (Refer to comp check table) Correct connection Change Compressor Check DC link capacitor Is it normal? (Refer to belows) Check Over load condition - Overcharging of refrigerant - Pipe Length - Condenser is blocked - Outdoor fan is locked Change Main PCB Change DC link capacitor Or Main PCB Remove obstruction Change outdoor fan or motor Change refrigerant Is it normal? Check the input power (Outdoor, Indoor unit) Change Compressor Dc link voltage table DC Link Voltage Model Type n operating Operating 1 Phase AUUW126C PSC DC300V 10% DC280V 10% AUUW186C PSC DC300V 10% DC280V 10% AUUW246D PFC DC300V 10% DC380V 10% AUUW306D PFC DC300V 10% DC380V 10% AUUW366D PFC DC300V 10% DC380V 10% AUUW426D PFC DC300V 10% DC380V 10% AUUW486D PFC DC300V 10% DC380V 10% AUUW606D PFC DC300V 10% DC380V 10% 3 Phase AUUW368D PSC DC540V 10% DC500V 10% AUUW428D PFC DC540V 10% DC680V 10% AUUW488D PFC DC540V 10% DC680V 10% AUUW608D PFC DC540V 10% DC680V 10% Copyright 2008 LG Electronics. Inc. All right reserved

16 4. Trouble Shooting 29 Title Cause of error Check point & rmal condition Inverter compressor over current Inverter compressor input current is over 30A 1. Overload operation (Pipe clogging/covering/eev defect/ref. overcharge) 2. Compressor damage(insulation damage/motor damage) 3. Input voltage low 4. ODU inverter PCB assembly damage Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Is compressor Wire connection condition normal? 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor 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 (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) Replace compressor if abnormality found 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 input voltage normal? Check L~N phase is 220V ±15% Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

17 5. Trouble Shooting 6.17 Check Trouble shooting CH32, CH33 32 Title Cause of error Check point & rmal condition D-pipe (Inverter) temp. high (105 C ) Discharge sensor (Inverter) temp. high Check the discharge pipe sensor for INV. Check the install condition for over load. Check the leakage of refrigerant. Check the SVC V/V open. Refer to sensor resistance table. 33 D-pipe (Constant) temp. high (105 C ) Discharge sensor (Cons.) temp. high Check the discharge pipe sensor for Cons. Check the install condition for over load. Check the leakage of refrigerant. Check the SVC V/V open. Refer to sensor resistance table. Check Flow Chart Check Over load condition - Refrigerant leakage - Condenser is blocked - Outdoor fan is locked Unplug the sensor on Outdoor unit PCB Remove obstruction Change outdoor fan or motor Change refrigerant Is the resistance of the sensor is 200kΩ at 25 C? Plug the sensor on Indoor unit PCB Change the sensor Check the Connector connection Estimate the Voltage of each sensor. Is it normal? Correct connection Is the voltage of the sensor is 4.5Vdc at 25 C Change the sensor Estimate the resistance of each sensor. Repair or Change the PCB. Copyright 2008 LG Electronics. Inc. All right reserved

18 4. Trouble Shooting Title Cause of error Check point & rmal condition 39 Transmission Error Between (PFC Micom INV Micom) Communication Error Between PFC Micom and INV Micom. 1. Micom defect/circuit defect 2. Different Micom S/W Version 3. ODU inverter PCB assembly damage Error Diagnosis and Countermeasure Flow Chart Is PFC Micom & INV Micom S/W Program normal? Upgrade Micom Program Is Inverter PCB assembly normal? Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

19 5. Trouble Shooting 6.18 Check Trouble shooting CH41, CH44, CH45, CH46, CH47, CH65 Title Cause of error Check point & rmal condition D-pipe sensor(inv) D-pipe sensor(cons) Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 200KΩ/ at 25 C (Unplugged) rmal voltage : 4.5Vdc / at 25 C (plugged) Refer to sensor resistance table. 44 Air sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 10KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) Refer to sensor resistance table Condenser Pipe sensor Suction Pipe sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 5KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) Refer to sensor resistance table. 65 Heat sink sensor Connector connection error Faulty PCB Faulty sensor (Open / Short) rmal resistor : 5KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) Refer to sensor resistance table. Check Flow Chart Unplug the sensor on Indoor unit PCB Estimate the Voltage of each sensor. Check the Connector connection Is the voltage of the sensor is 4.5Vdc / 2.5Vdc at 25 C Change the sensor Is it normal? Correct connection Repair or Change the PCB. Unplugged Plugged Estimate the resistance of each sensor. Is the resistance of the Sensor is 200kΩ/10kΩ /5kΩ at 25 C? Change the sensor 10kΩ 2.5Vdc Ω V Plug the sensor on Indoor unit PCB Check the resistance Check the voltage Copyright 2008 LG Electronics. Inc. All right reserved

20 5. Trouble Shooting 6.19 Check Trouble shooting CH51, CH60 Title Cause of error Check point & rmal condition 51 Over capacity Over capacity Combination Check the indoor unit capacity. Check the combination table. 60 EEPROM Check sum Check sum error Check the connection port. Check the poor soldering. Check Flow Chart (CH51) Check the indoor unit combination Check the outdoor unit max combination Is it normal? Check PCB Correct connection Check Flow Chart (CH60) Check the the connection port. Is it normal? Correct connection Change EEPROM Copyright 2008 LG Electronics. Inc. All right reserved

21 Single A: Inverter & Synchro (UU..W & UU72 / 100) Title Cause of error 52 Transmission error between (Inverter PCB Main PCB) Main controller of Master unit of Master unit can t receive signal from inverter controller 4. Trouble Shooting Check point & rmal condition 1. Power cable or transmission cable is not connected 2. Defect of outdoor Main fuse/ise Filter 3. Defect of outdoor Main / inverter PCB Error diagnosis and countermeasure flow chart Is transmission LED (Yellow) of inverter compressor PCB on? Is noise filter or fuse normal? Replace noise filter or fuse Replace inverter compressor PCB Is transmission cable connected correctly? Re-connect transmission cable Is MAIN PCB normal? Replace MAIN PCB Replace inverter compressor PCB Check Point - Check the Transmission connector and LED (Main & Inverter) 48/56k <Inverter PCB> Copyright 2007 LG Electronics. Inc. All right reserved. <MAIN PCB>

22 Troubleshooting Guide 14) Troubleshooting CH54 Title Cause of error Check point & rmal condition 54 3-phase wrong wiring of main outdoor unit 3-phase wrong wiring of outdoor unit (Reverse Phase /omission of phase) Abnormal Main PCB connection of CN_Phase Changed R, S, T connection order Check Point 1. Check the connection condition of R,S,T wire. 2. Check the connection condition of CN_Phase. 3. Check the outdoor main fuse. 22

23 6.20 Check Trouble shooting CH61, CH62 5. Trouble Shooting Title Cause of error Check point & rmal condition 61 Condenser pipe sensor temp. high condenser pipe sensordetected high temp.(65 C) Check the load condition. Check the sensor of Condenser pipe sensor. rmal resistor : 5KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (Plugged) 62 Heat sink sensor temp. high heat sink sensor detected high temp. (85 C) Check the load condition. Check the sensor of heat sink. rmal resistor : 10KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (Plugged) Check Flow Chart Check Over load condition - Refrigerant leakage - Condenser is blocked - Outdoor fan is locked Unplug the sensor on Outdoor unit PCB Remove obstruction Change outdoor fan or motor Change refrigerant Is the resistance of the Sensor is 5kΩ /10kΩ at 25 C? Plug the sensor on Indoor unit PCB Change the sensor Check the Connector connection Estimate the Voltage of each sensor. Is it normal? Correct connection Is the voltage of the sensor is 4.5Vdc / 2.5Vdc at 25 C Change the sensor Estimate the resistance of each sensor. Repair or Change the PCB. Copyright 2008 LG Electronics. Inc. All right reserved

24 4. Trouble Shooting 73 Title Cause of error Check point & rmal condition AC input instant over current error (Matter of software) Inverter PCB input power current is over 48A(peak) for 2ms 1. Overload operation (Pipe clogging/covering/eev defect/ref.overcharge) 2. Compressor damage (Insulation damage/motor damage) 3. Input voltage abnormal (L, N) 4. Power line assemble condition abnormal 5. Inverter PCB assembly damage (input current sensing part) Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? 1.Check Pipe clogging/distortion 2.Check Covering (Indoor/Outdoor Unit) 3.Check EEV connector assemble condition/normal operation 4.Check refrigerant pressure Reassemble or manage if abnormality found Is input voltage normal? Check L~N phase voltage is 220V ± 10% Check connection condition and wiring if power is abnormal Is AC input Wire connection condition normal? 1.Check L,N connection condition 2.Check wire disconnection and wiring Reassemble if abnormality found 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 inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

25 Troubleshooting Guide 16) Troubleshooting CH67, CH105 Title Cause of error Check point & rmal condition 67 Outdoor fan lock Outdoor fan is not operating Check the fan condition. Check the fan connector 105 Communication error between main PCB and fan PCB Communication error between main PCB and fan PCB Short or fusing of communication line Poor outdoor unit PCB Power input when the DC link capacitor discharges Check Point CH Check the install condition for fan. CH Is communication line between the main PCB and the fan PCB normal? 2. Is the communication LED on? 25

26 Single A Aan / uit, Single-split AT-C.. / AT-H.. LB-C.. / LB-D.. / LB-E.. / LB-G.. / LB-H.. LT-B.. / LT-C.. / LT-D.. / LT-E.. LV-B.. P03AH / P05AH / P08AH 26

27 Troubleshooting Guide 1) Troubleshooting CH01, CH02, CH06 Title Cause of error Check point & rmal condition 01 Indoor air sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 10K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 02 Indoor inlet pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 06 Indoor outlet pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 10k. 2.5Vdc. V Check the resistance Check the voltage Check Point 1. Unplug the sensor on Indoor unit PCB. 2. Estimate the resistance of each sensor. 3. If the resistance of the sensor is 10K. / 5K. at 25 C, then sensor is normal. 4. If the resistance of the sensor is 0 K. or 8, then sensor is abnormal. Change the sensor. 5. Plug the sensor on Indoor unit PCB and Power ON. 6. Estimate the voltage of each sensor. 7. If the voltage of the sensor is 2.5Vdc at 25 C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. Repair or Change the PCB. 27

28 Troubleshooting Guide 2) Troubleshooting CH03 03 Title Cause of error Check point & rmal condition Communication Wired R/C Open / Short Wrong connection Connection of wire Main PCB Volt. DC12V ise interference Wired R/C 12V S GND Indoor Unit 12V S GND CN-REMO 12Vdc 12Vdc V V Check the Volt. Check the Volt. Check Point 1. Check the wire connection. (Open / Short) Repair the connection 2. Check the soldering state of connector. (Soldered poorly) Repair or Change the PCB. 3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) Repair or Change the main PCB. 4. Check the installation of wired remote controller. (ise interference) Adjust the state of installation 28

29 Troubleshooting Guide 3) Troubleshooting CH04 04 Title Cause of error Check point & rmal condition Drain pump / Float switch Float switch Open. (rmal : short) The connection of wire(drain pump/ Float switch) Drain pump power input. (220V) Drain tube installation. Indoor unit installation. (Inclination) CN Float 0. CN-Float CN-D/PUMP. Check the resistance Check Point 1. Check the wire connection. (Open, Soldered poorly) Repair the connection or change the PCB. 2. Check the resistance of float switch (Abnormal : Open, rmal : short) Check the float switch. 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) Repair or Change the main PCB. 29

30 Troubleshooting Guide 4) Troubleshooting CH05, CH53 05 / 53 Title Cause of error Check point & rmal condition Communication (Indoor Outdoor) Communication poorly Power input AC 220V. (Outdoor, Indoor) The connector for transmission is disconnected. The connecting wires are misconnected. The GND1,2 is not connected at main GND. The communication line is shorted at GND. Transmission circuit of outdoor PCB is abnormal. Transmission circuit of indoor PCB is abnormal. Check Point 1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. Adjust the connection of wire Confirm the wire of Live, Neutral 3. Check the resistance between communication line and GND. (rmal : Over 2M. ) 4. Check the connector for communication is correctly connected. 5. Check the connection of GND1, GND2, and main GND. 6. 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 at outdoor unit. 30

31 Troubleshooting Guide 5) Troubleshooting CH21 21 DC Peak Title Cause of error Check point & rmal condition Instant over current Over Rated current Poor insulation of IPM An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W Over load condition - Overcharging of refrigerant - Pipe length. Poor insulation of compressor Comp U Resistance(. ) at 20 C V W. Terminal U-V V-W W-U Inverter comp Constant comp Comp Copper pipe. Resistance(. ) at 20 C Terminal U-GND V-GND W-GND Inverter comp. 2M. 2M. 2M. Constant comp. 2M. 2M. 2M. Check Point 1. Check the wire connection. (U,V,W) 2. Check the load condition. (Refrigerant, Pipe length, ) Adjust the load condition 3. Check the electricity leakage of the compressor. rmal : Over 2M.. 4. Check the resistance of compressor. rmal : (INV), 0.8. (Cons.) difference at each terminal. 5. Check the insulation from water at IPM part. Check the trace of water. 6. Check the IPM circuit. 31

32 Troubleshooting Guide 6) Troubleshooting CH21, CH22 21 Title Cause of error Check point & rmal condition Max. C/T Over current (14A ) Malfunction of compressor Blocking of pipe Low voltage input Refrigerant, pipe length, blocked, 22 C/T Internal circuit Initial current error Malfunction of current detection circuit. (Open / Short) The voltage of C01N Is 4.0Vdc(25A). V Check Point 1. Check the power source. 2. Check the fan operation is right. 3. Check the current Check the install condition. 5. Check the internal circuit. (C/T, Diode, Resistor) 108 Universal System Air Conditioner

33 Troubleshooting Guide 8) Troubleshooting CH24, CH25 Title Cause of error Check point & rmal condition 24 Press S/W Open Low / High press S/W open. Check the connection of CN_Press. Check the components. 25 Input voltage Abnormal Input voltage (140Vac, 300Vac. Check the power source. Check the components. TRANS1 50Hz, DC12V CN PRESS CN TRNAS1 Check Point CH Check the connection of CN_PRESS 2. Check the install condition for over load. 3. Check the SVC V/V open. 4. Check the leakage of refrigerant. CH Check the power source. 2. Check the components (Trans1, B/Diode, Diode, Resistance) 110 Universal System Air Conditioner

34 Troubleshooting Guide 10) Troubleshooting CH32, CH33 32 Title Cause of error Check point & rmal condition D-pipe (Inverter) temp. high (105 C ) Discharge sensor (Inverter) temp. high Check the discharge pipe sensor for INV. Check the install condition for over load. Check the leakage of refrigerant. Check the SVC V/V open. 33 D-pipe (Constant) temp. high (105 C ) Discharge sensor (Cons.) temp. high Check the discharge pipe sensor for Cons. Check the install condition for over load. Check the leakage of refrigerant. Check the SVC V/V open. D-Pipe temp. Toff(105) C T2(95) C T1(90) C COMP Frequency (Hz) rmal rmal OFF LEV Openness (Pulse) rmal rmal OFF Control Check Point CH Check the install condition for over load. 2. Check the SVC V/V open. 3. Check the leakage of refrigerant. CH Check the install condition for over load. 2. Check the SVC V/V open. 3. Check the leakage of refrigerant. 4. Check the constant compressor. (same with CH21) 34

35 Troubleshooting Guide 11) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65 Title Cause of error Check point & rmal condition 41 D-pipe sensor (Inverter) Open / Short Soldered poorly Internal circuit error rmal resistor : 200K. / at 25 C (Unplugged) rmal voltage : 4.5Vdc / at 25 C (plugged) 44 Air sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 10K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 45 Condenser Pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 46 Suction Pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 47 D-pipe sensor (Constant) Open / Short Soldered poorly Internal circuit error rmal resistor : 200K. / at 25 C (Unplugged) rmal voltage : 4.5Vdc / at 25 C (plugged) 65 Heat sink sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 10K. / at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged). Check Point 1. Estimate the resistance of each sensor.(unplugged) 2. Estimate the voltage of each sensor.(plugged) 3. If the resistance of the sensor is 0 k. or 8, then sensor is abnormal. If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal. 35

36 Troubleshooting Guide 12) Troubleshooting CH51, CH60 Title Cause of error Check point & rmal condition 51 Over capacity Over capacity Combination Check the indoor unit capacity. Check the combination table. 60 EEPROM Check sum Check sum error Check the PCB ASM P/. Check the poor soldering. Model Gross max. capacity Max. single indoor unit capacity AUUW126B 21k 12k AUUW186B AUUW246B 24k 12K AUUW306B AUUW366B 33k 18K AUUW k 18K AUUW k 24K Check Point CH Check the indoor unit capacity. CH Check the insertion condition of EEPROM. 2. Check the poor soldering 36

37 Troubleshooting Guide 13) Troubleshooting CH61, CH62 Title Cause of error Check point & rmal condition 61 Condenser pipe sensor temp. high Condenser pipe sensor detected high temp.(65 C) Check the load condition. Check the sensor of Condenser pipe sensor. 62 Heat sink sensor temp. high Heat sink sensor detected high temp.(85 C) Check the fan is locked. Check the sensor of heat sink. Heat Sink temp. Toff C T2 C T1 C COMP Frequency (Hz) rmal rmal OFF rmal Check Point CH Check the install condition for over load. (Refrigerant, Pipe length, Blocked, ) CH Check the fan is locked. 2. Check the Outdoor temp. is very high. 37

38 Troubleshooting Guide Troubleshooting CH54 Title Cause of error Check point & rmal condition 54 Phase error Phase change Check the Main power Check the CN_PHASE connector U V W Phase_A Phase_B 5.3 msec Phase_C Check Point 1. Check the Main power. 2. Check the connecting state of connector CN_3PHASE on the outdoor pcb ass'y. 38

39 LG Multi-split Inverter FM..AH 39

40 6.6 Troubleshooting Indoor Error 4. Trouble Shooting Title Cause of error Check point & rmal condition 01 Indoor air sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 10KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 02 Indoor inlet pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 06 Indoor outlet pipe sensor Open / Short Soldered poorly Internal circuit error rmal resistor : 5KΩ/ at 25 C (Unplugged) rmal voltage : 2.5Vdc / at 25 C (plugged) 10kΩ 2.5Vdc Ω V Check the resistance Check the voltage Check Point 1. Unplug the sensor on Indoor unit PCB. 2. Estimate the resistance of each sensor. 3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25 C, then sensor is normal. 4. If the resistance of the sensor is 0 KΩ or, then sensor is abnormal. Change the sensor. 5. Plug the sensor on Indoor unit PCB and Power ON. 6. Estimate the voltage of each sensor. 7. If the voltage of the sensor is 2.5Vdc at 25 C, then sensor is normal. 8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. Repair or Change the PCB. Copyright 2007 LG Electronics. Inc. All right reserved

41 4. Trouble Shooting 03 Title Cause of error Check point & rmal condition Communication Wired R/C Open / Short Wrong connection Connection of wire Main PCB Volt. DC12V ise interference Wired R/C 12V S GND Indoor Unit 12V S GND CN-REMO 12Vdc 12Vdc V V Check the Volt. Check the Volt. Check Point 1. Check the wire connection. (Open / Short) Repair the connection 2. Check the soldering state of connector. (Soldered poorly) Repair or Change the PCB. 3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) Repair or Change the main PCB. 4. Check the installation of wired remote controller. (ise interference) Adjust the state of installation Copyright 2007 LG Electronics. Inc. All right reserved

42 4. Trouble Shooting 04 Title Cause of error Check point & rmal condition Drain pump / Float switch Float switch Open. (rmal : short) The connection of wire(drain pump/ Float switch) Drain pump power input. (220V) Drain tube installation. Indoor unit installation. (Inclination) CN Float 0Ω CN-Float CN-D/PUMP Ω Check the resistance Check Point 1. Check the wire connection. (Open, Soldered poorly) Repair the connection or change the PCB. 2. Check the resistance of float switch (Abnormal : Open, rmal : short) Check the float switch. 3. Check the level of water 4. Check the volt. Of Drain pump power supply. (AC 230V) Repair or Change the main PCB. Copyright 2007 LG Electronics. Inc. All right reserved

43 4. Trouble Shooting 6.7 Troubleshooting Outdoor Error FM15AH t/m FM25AH 05 / 53 Title Cause of error Check point & rmal condition Communication (Indoor Outdoor) Communication poorly Power input AC 220V. (Outdoor, Indoor) The connector for transmission is disconnected. The connecting wires are misconnected. The GND1,2 is not connected at main GND. The communication line is shorted at GND. Transmission circuit of outdoor PCB is abnormal. Transmission circuit of indoor PCB is abnormal. Check Point 1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. Adjust the connection of wire Confirm the wire of Live, Neutral 3. Check the resistance between communication line and GND. (rmal : Over 2MΩ) 4. Check the connector for communication is correctly connected. 5. Check the connection of GND1, GND2, and main GND. 6. 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 at outdoor unit. Copyright 2007 LG Electronics. Inc. All right reserved

44 Multi-split: Inverter FM..AH 4. Trouble Shooting FM27AH t/m FM57AH Title 05 / 53 Title Communication (Indoor Outdoor) Cause of error Communication poorly Check point & rmal condition Power input AC 220V. (Outdoor, Indoor) The connector for transmission is disconnected. The connecting wires are misconnected. The communication line is shorted at GND. Transmission circuit of outdoor PCB is abnormal. Transmission circuit of indoor PCB is abnormal. Check Point 1. Check the input power AC230V. (Outdoor, Indoor unit) 2. Check the communication wires are correctly connected. Adjust the connection of wire Confirm the wire of "Live", "Neutral" 3. Check the resistance between communication line and GND. (rmal : 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 at outdoor unit. 6. If all indoor unit is displayed CH05 but outdoor PCB not display CH53 : Check the CN_COM and CN_POWER is correctly connected. L N < TERMINAL BLOCK > 27/30/40k 1. In Case of CH53, Check the Connection L, N at the terminal block 48/56k 1. In Case of CH05, Check the Connection CN-POWER, CN-COMM at the Main PCB 2. In Case of CH53, Check the Connection CN-COMM at the Main PCB L, N at the terminal block L N N L N CN-COMM CN-Power < MAIN PCB > Copyright 2007 LG Electronics. Inc. All right reserved

45 4. Trouble Shooting 21 Title Cause of error Check point & rmal condition DC PEAK (IPM Fault) Instant over current Over Rated current Poor insulation of IPM An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W Over load condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop Poor insulation of compressor Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Is compressor Wire connection condition normal? 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor 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 (1.083~1.123Ω ±5%) 2. Check insulation resistance between compressor terminal and pipe (over 50M ) Replace compressor if abnormality found 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 inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Comp checking method Comp U Resistance(Ω) at 20 C Ω Terminal Inverter comp. V W U-V V-W W-U Comp Copper pipe Ω Resistance(Ω) at 20 C Terminal U-GND V-GND W-GND Inverter comp. 50MΩ 50MΩ 50MΩ Copyright 2007 LG Electronics. Inc. All right reserved. 45

46 Multi-split: Inverter FM..AH FM15AH t/m FM25AH 4. Trouble Shooting 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN-L1(R), CN-L2(S), CN-L3(T) and CN-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). P U V W Nu Nv Nw P U V W Nu Nv Nw ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM check U, V, W R S T CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. Copyright 2007 LG Electronics. Inc. All right reserved. 46

47 4. Trouble Shooting 21 Title Cause of error Check point & rmal condition DC PEAK (IPM Fault) Instant over current Over Rated current Poor insulation of IPM An instant over current in the U,V,W phase - Comp lock - The abnormal connection of U,V,W Over load condition - Overcharging of refrigerant Pipe length. Outdoor Fan is stop Poor insulation of compressor Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Is compressor Wire connection condition normal? 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor 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 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 inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Comp checking method V Comp U W Ω Resistance(Ω) at 20 C Terminal U-V V-W W-U Inverter comp Constant comp Comp Copper pipe Ω Resistance(Ω) at 20 C Terminal U-GND V-GND W-GND Inverter comp. 2MΩ 2MΩ 2MΩ Constant comp. 2MΩ 2MΩ 2MΩ Copyright 2007 LG Electronics. Inc. All right reserved

48 Multi-split: Inverter FM..AH 4. Trouble Shooting FM27AH t/m FM41AH LED01M LED02M U,V,W CONNECTOR U V W 1. Wait until inverter PCB DC voltage is discharged 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). P U V W Nu Nv Nw P U V W Nu Nv Nw ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM chec U, V, W R S CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. Copyright 2007 LG Electronics. Inc. All right reserved. 48

49 Multi-split: Inverter FM..AH 4. Trouble Shooting FM49AH t/m FM57AH U V W LED01M LED02M CN(L)_BRWON CN(N)_BLUE U,V,W CONNECTOR 1. Wait until inverter PCB DC voltage is discharged after main power off. 2. Pull out CN(L), CN(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 damaged). P U V W Nu Nv Nw P U V W Nu Nv Nw ~ 0.6 V 0.4 ~ 0.6 V PFC_IPM chec U, V, W R S CAUTION In case that the control box is opend and before checking electrical parts, it should be checked that the LED 01M, 02M turned off(wait 7 minutes after main power OFF), otherwise it may cause electrical shock. Copyright 2007 LG Electronics. Inc. All right reserved

50 4. Trouble Shooting Title Cause of error Check point & rmal condition 22 Max. C/T Input Over Current 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Is compressor Wire connection condition normal? 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor 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 1.083~1.123Ω ±5% 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) Replace compressor if abnormality found 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 inverter PCB assembly power connection normal? Check connection between inverter PCB assembly and bridge diode(misconnection, disconnection) wiring again if abnormality found 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 power is abnormal. Is inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

51 Check Point 1. Check the power source.(200~240v) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (Check output pin 1.2 of the CT Sensor : 5V ) 4. Trouble Shooting Tester CT Sensor Output (at the INVERTER PCB) Copyright 2007 LG Electronics. Inc. All right reserved

52 4. Trouble Shooting 22 Max. C/T Title Cause of error Check point & rmal condition Input Over Current(27/30/40k-17A 48/56k-29A ) 1. Malfunction of Compressor 2. Blocking of Pipe 3. Low Voltage Input 4. Refrigerant, Pipe length, Blocked... Error Diagnosis and Countermeasure Flow Chart Is installation condition normal? Are the resistance Between each phase and insulation resistance of Inverter compressor normal? Is compressor Wire connection condition normal? 1. Check Pipe clogging/distortion 2. Check Covering (Indoor/Outdoor 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 (0.188 ±7%) 2. Check insulation resistance between compressor terminal and pipe (over 50MΩ ) Replace compressor if abnormality found 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 inverter PCB assembly power connection normal? Check connection between inverter PCB assembly and bridge diode(misconnection, disconnection) wiring again if abnormality found Is input voltage normal? Check L~N phase is 220V ±15% Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal? Check inverter PCB assembly IPM normality Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

53 FM27AH t/m FM57AH Multi-split: Inverter FM..AH 4. Trouble Shooting Check Point 1. Check the power source.(220v ±15%) 2. Check the fan operation is right. 3. Check the current. 4. Check the install condition. 5. Check the CT Sensor Output signal (27/30/40k - Check output the CT Sensor : DC 2.5±0.2V) (48/56k - Check output pin 1.2 of the CT Sensor : 5V ) Vdc < Input Power Source Check Point > < Main PCB> <CT Sensing Check Point> < Inverter PCB> Copyright 2007 LG Electronics. Inc. All right reserved. <CT Sensing Check Point>

54 4. Trouble Shooting Title Cause of error Check point & rmal condition 23 DC Link Low voltage DC Link volt is below 300V Check point & rmal condition Check the TAB1 is connect. At not operating : DC Link voltage(260v ) At Comp operating : DC Link voltage(500v ) Error Diagnosis and Countermeasure Flow Chart Is DC Link voltage under 380V? Check the DC link Voltage AD Input of Inverter PCB If AD Input is strange, change the Inverter PCB (refer the next page.) Is input voltage normal? R~S/S~T/T~R phase voltage is 400V ±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? Check connection from terminal block to Inverter PCB assembly CN_L1(R), CN_L2(S), CN_L3(T) Is Inverter PCB rmal? Replace inverter PCB assembly Recheck power and installation condition Copyright 2007 LG Electronics. Inc. All right reserved

55 FM15AH t/m FM27AH Multi-split: Inverter FM..AH 4. Trouble Shooting Check Point 1. Check the Tab1 connection condition. (Refer to outdoor wiring diagram) 2. Check the CN_L1(R), CN_L2(S), CN_L3(T) connection condition 3. Check the DC Link voltage at not operating(380v ) 4. Check the DC Link voltage at Comp operating(500v ) 5. Check DC Link Sensing Signal (Refer the Picture) Vdc 500Vdc ±10% + GND <INVERTER PCB> <DC Link Voltage Check Point> GND Tester DC Link Voltage oltage INV <INPUT VOLTAGE Check Point> Copyright 2007 LG Electronics. Inc. All right reserved