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1. O gt Check the another indoor unit CHO5 is displayed at indoor unit CH53 is displayed at out POWER TO INDOOR door unit SUPPLY UNIT Copyright 2008 LG Electronics Inc All right reserved 57 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 3 Troubleshooting CH21 paba Title Cause of error Check point 4 Normal condition e An instant over current in the U V W phase Comp lock e Instant over current The abnormal connection of U V W 21 DC Peak e Over Rated current e Over load condition e Poor insulation of IPM Overcharging of refrigerant Pipe length e Poor insulation of compressor Comp 7 N Resistance Q at 20 C 68 F Terminal Inverter comp Constant comp 0 64 0 8 0 64 0 8 Copper 0 64 0 8 Resistance Q at 20 C 68 F Terminal Inverter comp Constant comp U GND 2MQ 2MQ V GND 2MQ 2MQ W GND Check Point 1 Check the wire connection U V W 2 Check the load condition Refrigerant Pipe length 2MQ 2MQ gt Adjust the load condition 3 Check the electricity leakage of the compressor gt Normal Over 2MQ 4 Check the resistance of compressor gt Normal 0 65Q INV 0 8Q Cons gt No difference at each terminal 5 Check the insulation from
2. Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting E Error Indicator e The function is to self diagnoisis airconditioner and express the troubles identifically if there is any trouble e Error mark is ON OFF for the operation LED of evaporator body in the same manner as the following table e If more than two troubles occur simultaneously primarily the highest trouble fo error code is expressed e After error occurrence if error is released error LED is also released simultaneously e To operate again on the occurrence of error code be sure to turn off the power and then turn on e Having or not of error code is different from Model E 9 12kBtu h Model Display Indoor Outdoor 1 time ttime ttime ttime ttime e Indoor Temp sensor error Sensor open or short O 2times 2times 2times gj 2times Error Indicator Cause of Error e Outdoor Temp sensor error Sage Gene Sensor open or short L LO e Heat Sink sensor error qp Sensor open or short 23sec Heat Sink temp is over 95 5times 5times I d e Communication error 3sec ec e DC Peak error e Over current error CT2 e Indoor fan lock error BLDC fan model only Sie Ve Outdoor fan lock error 3 sec BLDC fan model only e D Pipe TH is short or open 4 LED Model j i j 46 Copyright 2008 LG Electronics Inc All right reserved LGE Interna
3. Model CT1 CT1 CT kBtu h Cooling Heating 9 7 5A 9A 10A 12 7 5A 9A 10A LGE Internal Use Only Part2 Functions 8 Controls 5 9 2 18 24 30kBtu h Model 1 Detection check the output DC voltage of Current Transformer CT 2 Current Transformer Sensing Error a In initial power input if the CT output is over 4 0V 25A it shows Error Code 40 defect in CT sensing 3 CT 1 detection a If total current exceeds CT1 value reduce 1 step of operating Hz Step down 10Hz from current step If new Hz is below the minimum frequency 15Hz then turn off the compressor b After step down H the total current exceed 1 for more than 5 sec then step down 1 more step c If the current continue below 1 for more than 1 min return the Hz to setting Hz 4 CT 2 detection a If total current exceeds CT2 turn off compressor And after 3 min turn on the compressor and check the current again b If CT2 occurs 5 times in 1 hour stop the operation and shows Error Code 22 Model CT 1 CT1 CT kBtu h Cooling Heating 18 11A 12A 14A 24 14A 12A 15 5A 30 11A 12A 14A Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 25 LGE Internal Use Only Part2 Functions 8 Controls 5 10 DC Peak control 5 10 1 DC Peak Current Error by a fault signal of IPM e H the operating current of IPM reaches 35A 3A the compressor stops instantly e If DC P
4. V Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1 C at least J When in air circulation mode compressor outdoor fan is stopped d Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange EVA a When displaying Error code refer to the trouble shooting guide Q Check the main power source AC 208V 230V Check the trouble shooting guide error code 6 9 Q Turn off main power J Check the electrical wiring diagram of Outdoor side Check the open or short of connecting wires between Indoor and Outdoor Copyright 2008 LG Electronics Inc All right reserved 43 LGE Internal Use Onl Only for training and service purposes y Part4 Trouble Shooting Trouble 4 The Compressor Qutdoor Fan don t operate 18 24 30kBtu h Model Turn on the main power J Operate Cooling Mode by setting the disired temperature of the remote controller is less than one of the Indoor temperature by 1 C at least Q When in air circulation mode compressor outdoor fan is stopped d Check the sensor for Indoor temperature is attatched as close as to be effected by the themperature of Heat Exchange EVA Q When displaying Error code refer to the troubl
5. e Air volume is controlled SH H Med Low by the remote con troller e LL step is selected automatically in Hot start operation 4 4 Natural Air Control Auto Wind e When the Auto Step is selected and then operated the high medi um or low speed of the airflow mode is operated for 2 15 sec ran domly by the Chaos Simulation 4 5 Chaos Swing Step Description LL Very low In heating mode L Low M Med H High SH Super high Auto Natural wind e By the Chaos swing key input the horizontal vane automatically operates with the Chaos swing or it is fixed to the desired direction 4 6 Sleep mode Auto control e When the set sleep time is reached set time of 1 2 3 4 5 6 7hour input by the remote control during the operation the operation of the appliance stops e When the appliance is on pause the sleep timer mode cannot be input 4 6 1 Sleep timer operation for cooling cycle e While in cooling mode 30 min after the start of the sleep timer the setting temperature increases by 1 C 2 F After another 30minutes lapse it increases again by 1 C 2 F Setting temp C Cooling ON temp Setting temp 0 5 C 1 F Cooling OFF temp Setting temp 0 5 C 1 F Sleep time hour NOTE Some Models are different by swing width and swing pattern Copyright 2008 LG Electronics Inc All right reserved 14 Only for training and service purposes
6. e The operating condition is set according to the outdoor temp and intake air temperature as follows tti f Indoor temp Operating Mode Setting temp ka ie S over 24 C 75 2 F Cooling 22 C 71 6 F 21 24 C 69 8 75 2 F Healthy Dehumidification 23 C 73 4 F High speed below 21 C 69 8 F Heating 24 C 75 2 F e The unit select the last operation mode in 3 hours e Operating procedures when the remote control can t be used is as follows The operation will be started if the ON OFF button is pressed If you want to stop operation re press the button The ON OFF switch is on the display PCB or side of indoor unit 4 2 Auto cleaning operation e Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor e Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion e The function is easy to operate as it is accessed through the Remote controller 1 Heat pump Model 2 Cooling only Model ON OFF ON OFF Cooling CYCLE Fan Heating Fan Cooling CYCLE Fan pi 13 Min 60 Sec 120 Sec GEN ON 30 Min omp ON OFF ON OFF a kaa Indoor Fan Setting Step LL LL LL Indoor Fan Setting Step Low Copyright 2008 LG Electronics Inc All right reserved 13 Only for training and service purposes LGE intemal Use Only Part2 Functions 8 Controls 4 3 Air volume control e Indoor fan motor control have 6 steps
7. 15V 10 Replace the P C B Module SMPS 3 ICO1D LD1085 ICO4D 7805 DC 5V 41 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part4 Trouble Shooting Trouble 2 Product doesn t operate with the remote controller 9 30kBtu h Model Turn on main power LL While the compressor has been stopped the compressor does not operate owing to the delaying function for 2 minutes after stopped LS When the compressor stopped Indoor Fan is driven by a low speed At this point the wind speed is not controlled by the remote controller When operated in the Sleeping Mode the wind speed is set to the low speed as force Sie LS Caused by the remote controller Caused by other parts except the remote controller EE E When the mark 4 is displayed in LCD screen replace battery Check the contact of CN DISP 1 2 connector mit Check DISP P C B Ass y Voltage between CN DISP1 DC 5V Check point e Check the connecting circuit between MICOM PIN and CN DISP1 PIN e Check receiver ass y Copyright 2008 LG Electronics Inc All right reserved 42 LGE Internal Use Onl Only for training and service purposes y Part4 Trouble Shooting Trouble 3 The Compressor Outdoor Fan don t operate 9 12kBtu h Model Turn on the main power
8. C 194 C Check Point e CH 32 e CH 33 1 Check the install condition for over load 1 Check the install condition for over load 2 Check the SVC V V open 2 Check the SVC V V open 3 Check the leakage of refrigerant 3 Check the leakage of refrigerant 4 Check the constant compressor same with CH21 e CH 40 1 If the resistance of the sensor is only co the check Is possible 2 If the error occurs again after the reset change the PCB Copyright 2008 LG Electronics Inc All right reserved 63 Only for training and service purposes EGE nema ee Only Part4 Trouble Shooting 9 Troubleshooting CH41 CH44 CH45 CH46 CH47 CH65 Gre Title Cause of error Check point amp Normal condition e Open Short e Normal resistor 200kQ at 25 C 77 F Unplugged 41 e e dee S SE e Normal voltage 4 5VDC at 25 C 77 F plugged e Open Short 44 Air s nsor GE Ge e Normal resistor 10kQ at 25 C 77 F Unplugged internal circuit eir r e Normal voltage 2 5VDC at 25 C 77 F plugged sapa Normal resistor 5kQ at 25 C 77 F Unplugged 4 Pi e Soldered poor i S eh e Internal Seed Gage e Normal voltage 2 5VDC at 25 C 77 F plugged Apan oten N resistor 5kQ at 25 C 77 F Unplugged tion Pi e Soldered poorl e Normal resistor a nplugge bi SE EES e Internal Se on e Normal voltage 2 5VDC at 25 C 77 F plugged E Normal resistor 200kQ at 25 C 77 F Unp
9. C 32 F and D pipe temperature lt 0 C 32 F Outdoor Temperature Running Time sec 5 6 Sump Heater Control 9 12kBtu h Model Only 5 C 23 F 0 C 32 F 90 10 C 14 F 5 C 23 F 180 Under 10 C 14 F 300 With low outdoor temperature the sump heater located on base panel prevents icing that may cause drain blockage and fan damage Heater on conditions Outdoor temp lt 0 C 32 F and heating mode Heater out conditions Outdoor temp gt 1 C 34 F Copyright 2008 LG Electronics Inc All right reserved 17 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 5 5 Automatic defrost 5 5 1 9 12kBtu h Model e While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit e Defrosting control is available 40 minutes later since heating cycle started and the difference of the pipe tem perature of outdoor unit reaches above option 1 e The defrosting control is available without reference to heating operation time only if the pipe temperature of outdoor unit reaches below option 2 The mean outdoor temperature 10 C 14 F less than 10 5 C 14 23 F between 5 0 C 23 32 F between 0 C 32 F more than Option 1 gt 4 gt 5 gt 5 The minimum Time of Heating sec Expected hea
10. Check indoor unit remove obstacles in indoor unit fan assembled correctly Description Check soldering state of CN Motor1 amp assembling state of DC Fan connector Check DC Fan Driving circuit Soldering state amp Direction RO1F RO9F CO1F CO3F ICO1F ICO3F Q01F Q02F ZD01F Cause of error Outdoor fan is locked BLDC fan model only Check flow YES e Outdoor fan is locked by an obstacle ex branch of tree bar etc e Fan connector is not connected to outdoor pcb assembly e Defective in DC fan driving circuit YES Outdoor fan is rotating 1 Outdoor fan is rotating 2 DG fan driving circuit is right Check outdoor unit Check connector is not remove obstacles in connected to outdoor pcb outdoor unit assembly CN FAN2 Check DC Fan driving circuit Soldering state amp Direction RO1F RO5F CO1F CO3F Q01F Q04F ZD01F Copyright 2008 LG Electronics Inc All right reserved 54 Only for training and service purposes LGE Internal Use Only Description Part4 Trouble Shooting Cause of error D Pipe TH is short or open eD pipe TH is short or open eD pipe TH is not connected to the outdoor pcb assembly e Damage or defect on the sensing circuit of outdoor pcb assembly Check flow YES D PIPE TH is connected to Outdoor pcb assembly Connect to CN D PIPE in outdoor pcb assembly Copyright 2008 LG Electronics Inc All right reserved
11. F All amount of refrigerant leaked out Check refrigeration cycle Refrigerant leakage Clog of refrigeration cycle Defective compressor Excessive amount of refrigerant Normal Temperature difference between intake and discharge air depends on room air humidity When the room air humidity is relatively higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger Copyright 2008 LG Electronics Inc All right reserved 40 Only for training and service purposes LGE Internal Use Only 6 Electro Part4 Trouble Shooting Trouble 1 The Product doesn t operate at all 9 30kBtu h Model Turn off the main power and wait until LED on outdoor PCB is off Turn on the main power again Does Beeping sound is made from the indoor unit Does Lighting LED is mounted on the outdoor PCB Check the voltage of power AC 208 230V 60Hz e The voltage of main power e The voltage applied to the unit e The connecting method of Indoor Outdoor connecting cable each color e The P W B Ass y Fuse Noise Filter Power Module SMPS ICO1D IC04D NG e Primarily the operating condi tion of Micom is O K e Check CN DISP1 The operation check of the P C B Ass y Procedure Specification Remedy 1 The input voltage of Power DC 220V 390V Module SMPS 2 The output voltage of Power
12. Outdoor piping temperature is below than 6 C 21 2 F Option for starting defrosting operation Constant Comp Option Defrosting Comp Fregency Control B bs bs Invert Comp 30 2 i Hz 350 Pulse Control Outdoor EEV Reversing Valve Hot gas bypass Option Oil separator Bypass valve Indoor Fan ON OFF Outdoor Fan Hi speed s Model kBtu h Defrosting Comp Frequency EEV 18 90Hz 350 24 77Hz 350 30 90Hz 350 19 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part2 Functions 8 Controls e Defrosting Control Algorithm 1 Lowering the compressor frequency when starts the defrosting operation Constant speed compressor is ON after 10 seconds from the arrival time of 30 Hz Option frequency and is speed up its revolution till 100 Hz Option 2 Every EEV have 350 pulse Option of opening when starts defrosting operation 3 Reversing valve is OFF after 5 seconds from arriving the compressor operating frequency of 30 Hz and then fans of indoor units turn OFF including the indoor unit with being OFF except the remote controller is being OFF 4 After 5 seconds from the time arriving 30 Hz fans of outdoor unit turn OFF and Hot Gas bypass Oil separator valve turn ON NOTE Comp frequency and EEV pulse is different each models e Control algorithm of defrost
13. 8 50 122 3 5 60 140 1 2 60 140 2 5 70 158 0 9 70 158 1 7 80 176 0 6 80 176 1 2 90 194 0 4 90 194 0 9 100 212 0 3 100 212 0 7 110 230 0 5 120 248 0 4 10 Troubleshooting CH51 CH60 po Title Cause of error Check point amp Normal condition 60 EEPROM e Check sum error e Check the PCB ASM P No Check sum e Check the poor soldering Check Point e CH 60 1 Check the insertion condition of EEPROM 2 Check the poor soldering Copyright 2008 LG Electronics Inc All right reserved 65 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 11 Troubleshooting CH61 CH62 pita Title Cause of error Check point 4 Normal condition 61 Condenser e Condenser pipe sensor e Check the load condition Pipe ZE detected high e Check the sensor of Condenser pipe sensor temp hig temp 65 C 149 F 62 Heat sink sensor Oe e Check the fan is locked t high e i emp hig temp 85 C 185 F Check the sensor of heat sink Heat Sink temp Normal Check Point e CH 61 e CH 62 1 Check the install condition for over load 1 Check the fan is locked Refrigerant Pipe length Blocked 2 Check the Outdoor temp is very high Copyright 2008 LG Electronics Inc All right reserved 66 Only for training and service purposes LGE Internal Use Only P NO MFL41161601 JAN 2008
14. C 77 F then sensor is normal If the resistance of the sensor is O KQ or then sensor is abnormal gt Change the sensor If the voltage of the sensor is 2 5VDC at 25 C 77 F then sensor is normal If the resistance of the sensor is O or 5VDC then sensor is abnormal gt Repair or Change the PCB LGE Internal Use Only Part4 Trouble Shooting 2 Troubleshooting CH05 CH53 pia Title Cause of error Check point amp Normal condition e Power input AC 208 230V Outdoor Indoor 05 e The connector for transmission is disconnected Booths The connecting wires are misconnected C t zing s i i Fee e Communication poorly e The GND1 2 is not connected at main GND 53 e The communication line is shorted at GND e Transmission circuit of outdoor PCB is abnormal Transmission circuit of indoor PCB is abnormal Check Point 1 Check the input power AC 208 230V Outdoor Indoor unit 2 Check the communication wires are correctly connected RY C COMP Adjust the connection of wire gt Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MQ 4 Check the connector for communication is correctly connected Check the connection of GND1 GND2 and main GND If one indoor unit is operated normally outdoor PCB is no problem a
15. LGE Internal Use Only Part2 Functions 8 Controls 4 6 2 Sleep timer operation for heating cycle e While in heating mode 60 min after the start of the sleep timer the setting temperature decreases by 1 C 2 F After another 60minutes lapse it decreases again by 1 C 2 F Setting temp C Heating ON temp Setting temp Heating OFF temp Setting temp 4 0 C 8 F Kab 1 2 Sleep time hr 4 7 Auto restart e When the power comes back after a sudden power failure during operation the mode before the power failure is kept on the memory of the appliance and it automatically operates in the saved mode on the memory e Operation mode that is kept on the memory State of operation ON OFF Operation mode setting temp selected airflow speed Sleep timer mode remaining time of sleep timer Chaos Swing 15 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part2 Functions 8 Controls 5 1 Five Seconds Stand by fan e The indoor unit fan rotates after 5 seconds when unit is turned on 5 2 Two Minutes Stand by comp e Compressor starts two minutes later after it is turned off 5 3 Hot start e When unit starts in the heating mode to prevent cold wind blowing the indoor fan does not rotate until the temp of heat exchanger reaches 30 C 86 F model by model 5 4 Freeze prevention Protection of the evaporator pipe
16. PCB assembly Right pcb is right Connect to CN TH2 in a aaah of TH Check soldering state of outdoor PCB assembl i RO1H RO2H CO1H about 10kQ at 25 C 77 F SES 9k 12kBtu h Model Heat sink Thermistor resistans check R T Graph 120 100 80 60 40 Resistance kQ 20 0 20 30 40 50 60 70 80 90 100110120 130 Temperature C Copyright 2008 LG Electronics Inc All right reserved 50 Only for training and service purposes LGE Intemal Use Only Error code Description Communication Error Check flow YES Wiring connection Indoor Outdoor Part4 Trouble Shooting Cause of error e Wrong or missing wiring between indoor and outdoor unit cable e Defect of communication components in indoor pcb assembly e Defect of communication components in outdoor pcb assembly e Defect of power supply components in outdoor pcb assembly e No ground connection in air conditioner unit affected by noise in power source YES Is the voltage of T Block in outdoor about 2 SE AC 208 230V Is the voltage of GND A DCS5V in Outdoor pcb about DC 5V 1 BR 1 BR Check power connector Check FUSE NF01 02J PTC 2 BL 2 BL Is not connected to the Power Module BD 01S in 3 GN YL 3 GN YL T Block in indoor unit Outdoor pcb assembly 4 RD 4 RD YES Communication circuit of indoor amp outdoor pcb Is right Check IC01K ICO2K D01K D03K ZD01K ZD03K RO1K R10K C01K C04K Copyright 2008 L
17. are automatically changed for com fortable sleep Auto Restart Function When power returns after a power failure Unit restarts in the previous operating mode Protection Controls amp Functions Five Second Delay Fan For noise prevention Two Minutes Stand by Comp For overload prevention Hot Start To prevent cold wind blow on heating mode start Freeze prevention Evaporator frost prevention Compressor Pre Heating To protect compressor Sump Heater Control To protect fan from accumulated ice at base panel 9 12k Model Only Automatic Defrost Condenser frost prevention Power Relay Control Over current prevention Inverter with inverter power control Modulation of voltage amp frequency Overheating Protection Power Module To protect power module Total Current Control Over Current Protection To protect power device DC Peak Control To protect power module Discharge Pipe Temp Control For overheating protection Low Ambient Function For operation at low temp Oil Return Control To protect compressor Oil Equalizing Control To protect compressor NOTE The Exploded View SVC Manual has the particular Function table for each model Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 2 1
18. h Model 1 There can be two situations a Sensor is failed Error Code 41 b Abnormal high temperature discharge temperature error code for high discharge will be generated Both cases unit will stop 2 Compressor working a If discharge pipe temperature T1 No limitation on compressor frequency b T2 lt discharge pipe temperature T off Hysteresis control Compressor frequency down by 5Hz and expan sion valve up by 10 pulse in every 1 min c Discharge pipe temperature gt Toff Compressor will be off System will stop if this situation occurs 5 times in 1 hour and error code will be generated D Pipe temp Toff 105 C 221 F Bs T2 95 C 203 F L ae T1 90 C 194 F Ka Na 5 Hz lege Copyright 2008 LG Electronics Inc All right reserved 27 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 5 11 3 Constant Compressor only 30kBtu h Model 1 There can be two situations a Sensor is failed Error Code 41 b Abnormal high temperature discharge temperature error code for high discharge will be generated Both cases unit will stop 2 Compressor working a If discharge pipe temperature lt T1 Compressor ON EEV on time control b T2 lt discharge pipe temperature lt Toff Hysteresis control Expansion valve up by Bpulse every 1 min If EEV is in the starting control it will follow it as it is c Discharge pipe temperature gt Toff Compressor w
19. is no force pulling the cable from the connection terminals Improper or loose connections can cause heat generation or fire Do not touch operate or repaire the product with wet hands Holding the plug by hand when taking out Otherwise there is risk of electric shock or fire GO 9 be 44CAUTION Do not turn on the breaker when the front panel and cabinet are removed Be sure to ground the air conditioner with an earthing conductor connected to the earthing terminal Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently Otherwise working on the unit the hot refrigerating cycle section can cause burns Do not tilt the unit while removing panels Otherwise the water inside the unit can spill and wet floor Do not use the welder in a well ventilated place Using the welder in an enclosed room can cause oxygen deficiency Be sure to turn off power switch before connecting or disconnecting connector or parts damage may be occur gt oO oe Copyright 2008 LG Electronics Inc All right reserved 5 Only for training and service purposes LGE Internal Use Only Part1 General Information 1 2 Inspections after Repair A WARNING Check to see if the power cable plug is not dirty or loose If the plug is dusty or loose it can cause an electrical shock or fire Do not use a joined power cable or extension cable or share
20. operates at low speed or comes to a stop 2 4 Auto changeover operation e The air conditioner changes the operation mode automatically to keep indoor temperature steady e When room temperature vary over 2 C 4 F with respect to setting temperature air conditioner keeps the room tem perature in 2 C 4 F with respect to setting temperature by changing the mode from cooling to heating and vice versa 4 C 8 F Switching point 2 C 4 F 0 5 C 1 F Setting Temp 0 5 C 1 F 2 C 4 F Heating thermo off Cooling thermo off Switching point Cooling Mode operation Heating operation l l l Cooling operation Copyright 2008 LG Electronics Inc All right reserved 11 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 3 Spec 3 1 Jet Cool operation e In the heating mode or Fuzzy operation the Jet cool function does not work When it is input while in other mode of operation cooling dehumidification ventilation the Jet cool operation takes place e In the Jet cool mode the indoor fan is operated at super high speed for 30 min at cooling mode operation e In the Jet cool mode the room temperature is maintained at a setting temperature of 18 C 64 4 F e When the sleep timer mode is input during the Jet cool operation the Jet cool mode has the priority e When the Jet cool button is pressed the horizontal vane of the uni
21. the same power outlet with other electrical appliances otherwise it can cause an electrical shock excessive heat generation or fire Do not insert hands or other objects through the air inlet or outlet while the prod uct is operating There are sharp and moving parts that could cause personal injury GO oO GO SG Do not block the inlet or outlet of air flow It may cause product failure 44CAUTION Check to see if the parts are mounted correctly and wires are connected Improper installation and connections can cause an electric shock or an injury Check whether the installation platform or frame has corroded Corroded installa tion platform or frame can cause the unit to fall resulting in injury Be sure to check whether the earth wire is correctly connected After the work has finished be sure to do an insulation test to check whether the resistance is 2 Mohm or more between the charge 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 SUE e e Check the drainage of the indoor unit after the repair If drainage is faulty the water may enter the room and wet floor Copyright 2008 LG Electronics Inc All right reserved 6 Only for training and service purposes LGE Internal Use Only Part1 General Information A s W 1 2 6 4 G G 1 1 2 3
22. 2 way and 3 way valves are set to the open position Remove the valve stem caps and confirm that the valve stems are in the raised position Be sure to use a hexagonal wrench to operate the valve stems 2 Operate the unit for 10 to 15 minutes 3 Stop operation and wait for 3 minutes then connect the charge set to the service port of the 3 way valve Connect the charge hose with the push pin to the service port 4 Air purging of the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the 2 way valve to the closed position Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cating 3 to 5kg cm g 8 Disconnect the charge set and mount the 2 way and 3 way valve s stem nuts and the ser vice port nut Use torque wrench to tighten the service port nut to a torque of 1 8 kg m Be sure to check for gas leakage 37 LGE Internal Use Only Part4 Trouble Shooting Outdoor unit e Procedure 1 Connect the vacuum pump to the center hose 3 Close the valve Lo side on the charge set of charge set center hose turn off the vacuum pump and confirm t
23. 4 5 6 7 3 9 10 Code Type Code of Model Meaning 1 Production Center A Z L Chang won R22 Refrigerant A Chang won R410A 2 Product Type A Z S Split Type Air Conditioner 3 Cooling Heating Inverter A Z C Cooling Only H Heat Pump X C O E Heater Z H P E Heater V AC Inverter C O N AC Inverter H P Q DC Inverter C O W DC Inverter H P 4 5 Capacity 0 9 Cooling Heating Capacity Ex 09 gt 9 000 Btu h 6 Electric Range 1 9 1 115V 60Hz A Z 2 220V 60Hz 3 208 230V 60Hz 5 200 220V 50Hz 6 220 240V 50Hz 7 110V 50 60Hz 7 Chassis A Z Name of Chassis 8 Look A Z Look Color Artcool Model 9 10 Function A Z A Basic B Basic 4Way C Plasma Filter D Plasma Filter 4 Way E Tele LCD F Tele LCD Nano plasma 4Way G NBF F A changeove A clean Low A H NBF F A changeove A clean 4way Low A l Tele LED 4way J Internet K Plasma F 4Way Oxygen generator L NBF F A changeove A clean M NBF F A changeove A clean 4way N NBF F A changeove A clean PTC P NBF F A changeove Autoclean 4way PTC Q NBF F A changeove A clean 4way Low A PTC R Negative ion A Clean S Nano Plasma Negative ion A Clean T 4way Nano Plasma F Negative ion A Clean U Nano Plasma F 4Way A changeove A clean Oxygen generator V 4way Nano Plasma F Negative ion A Clean Oxygen generator W Dry contact Y Basic Low A 11 Serial No 1 9 LG Model Development Serial No Copyright 2008 LG E
24. Cooling Mode 0 5 C 1 F Thermo ON Setting Temp 0 5 C 1 F Thermo OFF INV Comp Frequency High lt gt Low Comp OFF High lt Low e Operating frequency of compressor depends on the load condition like the difference between the room temp and the set temp frequency restrictions e If the compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds not emergency conditions e Compressor turned off when intake air temperature is in between 0 5 C 1 F of the setting temp limit for three minutes continuously intake air temperature reaches below 1 0 C 2 F of the temperature of setting temp e Compressors two minutes time delay After compressor off the compressor can restart minimum 2 minutes later 2 2 Heating Mode 5 C 9 F Thermo OFF 2 C 3 6 F Setting Temp Thermo ON INV Comp Frequency High 3p Low Comp OFF High lt Low Comp OFF e Operating frequency of compressor depend on the load condition The difference between the room temp and set temp frequency restrictions e If compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 sec onds e Condition of compressor turned off When intake air temperature reaches 5 C 9 F above the setting temperature e Condition of compressor turned on When intake air t
25. EAK occurs 5 times within 1 hour the appliance turns off and displays Error Code 6 9 12kBtu h Model Error Code 21 18 24 30kBtu h Model 5 10 2 DC Peak Current Error by the compressor lock e If the DC LINK voltage below DC 140V occurs 5 times within 1 hour while the compressor is operating the appliance turns off and display Error Code 6 9k 12k Model Error Code 23 18k 24k 30k Model 5 10 3 DC Peak Current Error by the Outdoor Fan Lock e If this problem occurs 5 times within 1 hour in case of the temperature of outdoor pipe TH is over 65 C 149 F while the compressor is operating the appliance turns off and displays Error Code 6 9 12kBtu h Model Error Code 61 18 24 30kBtu h Model 5 11 Discharge Pipe Temp Control 5 11 1 9 12kBtu h Model e If the temperature of the discharge pipe of compressor reaches over 130 C 266 F or below 30 C 22 F the com pressor stops instantly e The compressor operating frequency is limited according to the compressor dome TH Refer to below Fig e Temperature range of COMP SPEC varies by 10 C 50 F D Pipe Temp zl S e Si ee NS T3 12 AT 13 C 8 6 CF COMP Freq Fhmin Free 2 Feil Free T off 110 C 230 F T2 100 C 212 F Copyright 2008 LG Electronics Inc All right reserved 26 Only for training and service purposes LGE Intemal Use Only Part2 Functions amp Controls 5 11 2 Inverter Compressor 18 24 30kBtu
26. G Electronics Inc All right reserved Only for training and service purposes YES Ground connection is installed power outlet or outdoor chassis Earth port Install ground connection from outdoor unit In case power outlet has no earth port 51 S LGE Internal Use Only Part4 Trouble Shooting Description Cause of error e Supplied power is not normal e Comp Connector CN U V W is disconnected or inserted to wrong position e Compressor is damaged coil short 3 replace compressor e Too much Refrigerant e Defect in outdoor pcb assembly 3 replace pcb assembly DC Peak Error Check flow YES YES Supplied voltage to Is connector CN U V W Outdoor pcb is about connected to compressor and N Refrigerant pressure is right AC 208 230V inserted to pcb in right position Check CN U V W connector U RD V BL W YL Check refrigerant pressure and adjust Check power source YES YES Inverter components in outdoor pcb assembly are Is th ight i s the compressor rig right Check resistance 9 K 12K Model Between U V V W U W port Check gt Short Open circuit Short of SPM3 pins GND P U V W pin Comp motor coil error Direction of D01Z D03Z C08Z 10Z 12Z 16Z normal 1 2Q Assembling state of RO1P R21P 8 ICO1P Between U V W and Body Assembling state of screw between INV IC A normal over 10MQ Heat sink DC 15V output of Power module C
27. Only for training and service purposes D PIPE TH is right YES Sensing circuit of outdoor pcb is right Check D PIPE TH Measure resistance of TH about 200kQ at 25 C 77 F Check soldering state of R07H RO8H C04H 55 LGE Internal Use Only Part4 Trouble Shooting E Troubleshooting Guide 18 24 30kBtu h Model 1 Troubleshooting CH01 CH02 CH06 pie Title Cause of error Check point amp Normal condition e Open Short 01 Indoor air sensor e Soldered poorly Normal resistor 10kQ at 25 C 77 F Unplugged s Internal circuit error Normal voltage 2 5VDC at 25 C 77 F plugged e Open Short d Normal resistor 5kQ at 25 C 77 F Unplugged 02 lndoorinler pipe sensor S KE Normal voltage 2 5VDC at 25 C 77 F plugged 1a Aoh rl Normal resistor 5kQ at 25 C 77 F Unplugged 06 Indoor outlet pipe sensor H er Ee Gen Normal voltage 2 5VDC at 25 C 77 F plugged 10kQ 2 5VDC Q V II sii Check the resistance Check the voltage ka aka Point 1 Unplug the sensor on Indoor unit PCB DJ O 0 FW N Copyright 2008 LG Electronics Inc All right reserved Estimate the resistance of each sensor Plug the sensor on Indoor unit PCB and Power ON Estimate the voltage of each sensor Only for training and service purposes 56 If the resistance of the sensor is 10kQ 5kQ at 25
28. be different for each model After the system is stopped by CT cut or heat sink cut off then the cycle returns to the normal condtiond control Outdoor pipe temp T2 0 C T1 0 C O D fan Set speed Model T1 C F T2 C F 18kBtu h 18 64 18 24kBtu h 16 61 16 30kBtu h 0 32 0 Copyright 2008 LG Electronics Inc All right reserved 29 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 5 13 Oil return control 30kBtu h Model 5 13 1 Operating Contion 1 When the continuous running time is over 3hr option oil returning operation is made for 3min In case of the initial operation oil returning operation is made after completing initial operation 2 After defrost and oil returning operation the continuous running time is resetted 5 13 2 Operation Process 1 2 3 4 EEV Full open Hot gas bypass valve On Compressor Step 70HZz Constant Comp On Option Reversing valve Off Process of Off On follows defrost operating we KA na ma Outdoor Fan Low step 5 14 Oil equalizing control 30kBtu h Model Operating condition 1 When the continuous inverter compressor running time at under 40 Hz option is over 2 hours option in 2 com pressor system oil restoring operation is made 2 If compressor operating Hz is below 40 Hz by the safety control the accumulated time will be cleared and oil restoration is not made 3 During this
29. ce 28 High voltage 420VDC J Check the DC Link Voltage Check Point REACTOR 26 8mH 9A vc 1 Check the power source NOY e i 2 Check the DC Link Voltage BDOIS D2 nM O ava SPS j H cos C02S BK J AS ment ot ue DS L Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 60 LGE Internal Use Only Part4 Trouble Shooting 6 Troubleshooting CH24 CH25 pia Title Cause of error Check point amp Normal condition 24 Press S W Open e Low High press e Check the connection of CN Press S W open e Check the components e Abnormal Input voltage e Check the power source Input volt a Ee 140VAC 300VAC f Check the components TRANS1 60Hz DC12V 5V 4 DOZC ROTC A Dt 1N4148 1K 1 4 1N4007 5 W Wt INPUT VOLT Gi cose J K LO RO6C ae ug 102 Check Point e CH 24 e CH 25 1 Check the connection of CN_PRESS 1 Check the power source 2 Check the install condition for over load 2 Check the components 3 Check the SVC V V open Trans1 B Diode Diode Resistance 4 Check the leakage of refrigerant Copyright 2008 LG Electronics Inc All right reserved 61 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 7 Troubleshooting CH26 CH27 paba Title Cause of error Check point amp Normal condition e Check the connec
30. completion 1 Frequency of compressor lowering to 30 Hz and maintain constant speed operation with 30 Hz for 75 seconds and then stating operation If the constant speed compressor is OFF it will be receive OFF signal after 5 sec onds from the arrival time of 30 Hz 2 3 4 5 The EEV will open with the standard previous pulse after 5 seconds from the time of 30 Hz Reversing valve is ON after 15 seconds from the time of 30 Hz of compressor frequency Fan of outdoor unit is ON with high speed and maintain it after 5 seconds from the time of 30Hz e AH AK a Hot Gas bypass valve Oil separator bypass valve make OFF after 75 seconds from the time of 30Hz NOTE Comp frequency and EEV pulse is different each models Copyright 2008 LG Electronics Inc All right reserved 20 Only for training and service purposes LGE Intemal Use Only Part2 Functions 8 Controls 5 6 Power Relay Control e Power relay turns on 1 second later after the power is supplied to the outdoor unit e Control sequence power on gt PTC operating gt power relay on 5 7 Inverter 1 The single phase power AC is converted into DC 2 The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency 3 When the frequency changes the rotation speed of the compressor changes resulting in an changed refrigerant circu lation This leads to changeable amount of the heat exchange per unit Copyright 2008 LG Ele
31. ctronics Inc All right reserved 21 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 5 8 Overheating Protection Power Module 5 8 1 9 12kBtu h Model e If the temperature of the heat sink thermistor reaches over Toff the Compressor stop instantly e The compressor operating frequency is limited according to the heat sink thermistor refer to below FIG e It will blink 4 times when the thermistor is open or short also when the temperature is over T off AT T off T on 3 Heat Sink Temp T1 Ton AT T2 Ton 2 AT T on 85 C 185 F Model by Model T off 95 C 203 F Model by Model s933 Copyright 2008 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Part2 Functions 8 Controls 5 8 2 18 24 30kBtu h Model e Function Power module failure protection by checking the temperature of heat sink There is a temperature sensor for checking the heat sink temperature e Heat sink sensor failure error Short Check if temperature gt 130 C 266 F Open Check if temperature lt 30 C 22 F System will go in self diagnosis Error code 65 is displayed and product stops e Heat sink temperature control a Heat sink temperature lt T2 No limitation on compressor frequency b T2 lt heat sink temperature lt Toff Compressor frequency down by 5 Hz c Heat sink temperature gt Toff Compressor wi
32. e purposes LGE Internal Use Only Part4 Trouble Shooting LED01G LED02G Outdoor Contents Red Green Case of error Status CT Circuit open short 4 times Q O CT Circuit malfunction D pipe sensor INV open short 4 times 1 time Open Short Air sensor open short 4 times Q 4 times Open Short Cond Pipe sensor open short 4 times Q 5 times Open Short Suction pipe sensor open short 4 times Q 6 times Open Short D pipe sensor Cons open short 4 times Q 7 times Open Short Communication Indoor Outdoor 5times 3 times Communication Poorly EEPROM check sum 6 times O Check sum mismatching Cond Pipe sensor temp high 6 times 1 time Cond Temp high Heat sink sensor temp high 6 times 2 times Heat sink temp high Heat sink sensor open short 6 times Gf 5 times Open Short Copyright 2008 LG Electronics Inc All right reserved 48 Only for training and service purposes LGE Intemal Use Only Part4 Trouble Shooting E Troubleshooting Guide 9 12kBtu h Model Description Cause of error e Indoor TH sensor is short or open Indoor TH is short or e Indoor TH sensor is not connected to the indoor pcb assembly open e Damage or defect on the sensing circuit of indoor pcb assembly RO1H RO2H RO3H RO4H CO1H CO2H Check flow YES YES Indoor TH is connected to Indoor TH
33. e shooting guide Q Check the main power source AC 208V 230V Check the trouble shooting guide error code 21 26 Check that CN_FAN A B supplied voltage to outdoor PCB is about AC 208V 230V Q Turn off main power Q Check the electrical wiring diagram of Outdoor side Check the open or short of connecting wires between Indoor and Outdoor Copyright 2008 LG Electronics Inc All right reserved 44 Only for training and service purposes LGE Intemal Use Only Part4 Trouble Shooting Trouble 5 When indoor Fan does not operate 9 30kBtu h Model Tum off main power Q Check the connection of CN FAN Q Check the Fan Motor 4 Check the Fuse AC250V T2A J Check the related circuit of indoor Fan Motor e The pin No 8 of micom and the part for driving SSR Q01M e Check the related pattern e Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF Q Turn on the main power J Check the SSR high speed operation by remote control the Indoor Fan Motor is connected The voltage of Pin No 1 orange and 3 black of CN FAN About AC 160V over About AC 50V over SSR is not damaged Check SSR Copyright 2008 LG Electronics Inc All right reserved 45
34. emperature reaches 2 C 3 6 F above the setting temperature Condition of indoor fan turned off While in compressor on indoor pipe temp lt 20 C 68 F While in compressor off indoor pipe temp lt 30 C 86 F e While in defrost control the indoor and outdoor fans are turned off e Compressor 2minutes delay After compressor off the compressor can restart minimum 2 minutes later Copyright 2008 LG Electronics Inc All right reserved 10 Only for training and service purposes LGE Intemal Use Only Part2 Functions 8 Controls 2 3 Healthy Dehumidification operation e When the dehumidification operation is set by the remote controller the intake air temperature is detected and the set ting temp is automatically set according to the intake air temperature Intake air Temp Setting Temp 26 C 78 8 F s intake air temp 25 C 77 F 24 C 75 2 F lt intake air temp lt 26 C 78 8 F intake air temp 1 C 2 F 22 C 71 6 F lt intake air temp lt 24 C 75 2 F intake air temp 0 5 C 1 F 18 C 64 4 F lt intake air temp lt 22 C 71 6 F intake air temp intake air temp lt 18 C 64 4 F 18 C 64 4 F e When intake air temp is 1 C 2 F above the setting temp condition of compressor is same as in cooling mode operation e When intake air temperature reaches 1 C 2 F below the setting temp compressor operates in step1 step3 and the indoor fan speed again
35. from frosting e If the indoor pipe temperaure is below 0 C 32 F in 7 min after the compressor operates without pause while in cool ing cycle operation mode 3 compressor outdoor fan are turned off e When indoor pipe temp is 7 C 44 6 F or higher after 2 min pause of compressor gt compressor outdoor fan is turned on according to the condition of the room temperature Indoor pipe temp 7 C 44 6 F Comp free 6 C 42 8 F 3 C 37 4 F T1 Comp Step 4 Comp Step 2 T1 0 2 C 32 35 6 F NOTE Some Models are different by T1 Copyright 2008 LG Electronics Inc All right reserved 16 Only for training and service purposes LGE Intemal Use Only 5 5 Compressor Preheating 5 5 1 9 12kBtu h Model Part2 Functions 8 Controls With low outdoor temperature It preheats the compressor to maintain the oil viscosity before the unit starts Preheating Mode preheats the compressor motor coil by electric current without compressor running Mode in conditions Outdoor temp lt 0 C 32 F and D pipe temp lt 15 C 59 F Mode out conditions Outdoor temp gt 5 C 41 F or D pipe temp lt 25 C 77 F or Compressor on 5 5 2 18 24 30kBtu h Model When the unit starts with low outdoor temperature It preheats the compressor to maintain the oil viscosity If it is under the following conditions the compressor runs with 15Hz for a specific time Conditions heat sink temperature lt 0
36. hat the gauge needle does not move approxima 2 Evacuation for approximately one hour tely 5 minutes after turning off the vacuum Confirm that the gauge needle has moved pump toward 0 8 Torr 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Copyright 2008 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Intemal Use Only Part4 Trouble Shooting Charging cylinder Outdoor unit e Procedure 1 Connect the charge hose to the charging cylinder Connect the charge hose which you dis con nected from the vacuum pump to the valve at the bottom of the cylinder If you are using a gas cylinder also use a scale and reverse the cylinder so that the sys tem can be charged with liquid 2 Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air Be careful of the liquid refriger ant The procedure is the same if using a gas cylinder 3 Open the valve Lo side on the charge set and charge the system with liquid refrigerant If the system can not be charged with the spec ified amount of refrigerant it can be charged with a little at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is n
37. he main power supply Copyright 2008 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Intemal Use Only Part3 Test Run Copyright 2008 LG Electronics Inc All right reserved 33 Only for training and service purposes START Test operation for indoor unit Operate the unit in cooling mode g Refer to part4 7 Electric part Does Test operation start Yes Is cold air discharged for more than 3 minutes Yes Refer to part4 5 Cycle part Is there any temperature difference between intake and discharged air Yes Is the operating current No Check the load In Out Temp normal Check pipe length and amount of Yes refrigerant Check for abnormal sound in outdoor unit comp Fan others Operation mode change to Heating mode Is hot air discharged No Refer to Troubleshooting After Hot Start Guide Yes Normal NOTE When outdoor temperature is low the unit is operated to Heating mode LGE Internal Use Only Part3 Test Run 1 Check that all tubing and wiring have been properly con nected 2 Check that the gas and liquid side service valves are fully open Settlement of outdoor unit e Anchor the outdoor unit with a bolt and nut 10mm tightly and horizontally on a concrete or rigid mount e When installing on the wall roof or rooftop anchor the mounting base securely with a nail or wire assuming the influence of wi
38. http biz Igservice com Room Air Conditioner MODEL General Wall Mounted Inverter Type CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Air Conditioner Service Manual CONTENTS Part 1 General Information 1 SaleTy Precautions E 4 2 dw EVEN 7 Part2 Functions 4 Controls T List Of Functions amp CON NI binan AA 9 2 Basic Mode Control aaa NN ANN ANAN AA NA 10 3 Special Mode Controls EE 12 A Utility FUNCHONS kaanak green gEe eeegehEEEEENE EE eebr NeeEeEeeeec 13 5 Protection Functions 4 Comtrols ssscsssscccssecssseessnsesssseessssesssenessseesssseensenesssoees 16 Part3 Test Run 1 Check before Test Run 3 KEEN ccc NANA dana ANA ANA eeh 32 2 TeSt RuniFlow Charina ANNA AE Se dea coe Tee dba asr a oie Cdi idi aask 33 3 TESERUN Detail MAGANDA NAAANINAG ARAMA NAN 34 Part4 Trouble Shooting Guide US E E EVA IC 36 2 Pumping DONNA AANGAT ANG 37 3 Evacuation All amount of refrigerant leaked amannnanuaanunannunauaananunana0n 38 4 Gas Charging After Evacuation ccsccssecesesseesseeesseeeseeesseeeneesesneeneeeeseessenensaeenes 39 5 Cycle Troubleshooting Guide ciscsssiciceeccctetecsvinssdsstenseantsscsssecesdderiseasevenssancceccorsatadie 40 6 Electric Parts Troubleshooting Guide sccccscceeesseeeseeeeneeseeeeeeeeeeeeeneeeeseeseeenseeeees 41 7 Selt diagnosis FUNCTION kapakanan AKIRA AASA 46 Copy
39. ill be OFF System will stop if this situation occurs 5 times in 1 hour and error code will be generated Error Code 33 Toff 105 C 221 F D Pipe temp a T2 95 C 203 F T1 90 C 194 F Expansion On time On time valve control control Copyright 2008 LG Electronics Inc All right reserved 28 Only for training and service purposes LGE Intemal Use Only Part2 Functions 8 Controls 5 12 Low Ambient control 5 12 1 9 12kBtu h Model e If outdoor temperature drops below certain temperature liquid back is prevented by On Off control of outdoor fan e It can prevent frosting of evaporator and keep cooling operation Model Mode in Condition Mode out Condition 2 EE Outdoor fan on time 2 3 min Outdoor fan off time 2 5 min palda Ge And Outdoor pipe temp lt 4 C 39 F Or Outdoor pipe temp lt 20 C 68 F And Outdoor temp lt 10 C 50 F And Outdoor temp 10 C 50 F Moden eumd Comp on time 2 5 min Outdoor fan off time 2 5 min esch d E And Indoor pipe temp lt 4 C 39 F Or Indoor pipe temp lt 4 C 39 F EP p And Outdoor temp lt 10 C 50 F And Outdoor temp gt 10 C 50 F 5 12 2 18 24 30kBtu h Model Low ambient cooling case In this situation outdoor fan works in ON OFF control If the pipe temperature 0 C 32 F and it is falling rapidly in that case compressor will run for 5 min amp then it will go in low ambient control 3 Temp value can
40. is right Sensing circuit of indoor Indoor pcb assembly SI pcb is right Check Indoor TH Connect to CN TH1 in Measure resistance of TH Check soldering state of indoor pcb assembly air about 10kQ at 25 C 77 F RO1H RO4H CO1H C02H pipe about 5kQ at 25 C 77 F Description Cause of error e Outdoor TH sensor is short or open Outdoor TH is short or e Outdoor TH sensor is not connected to the outdoor pcb assembly open e Damage or defect on the sensing circuit of outdoor pcb assembly RO3H RO6H CO2H CO3H Check flow YES YES Outdoor TH is connected to ae Sensing circuit of outdoor outdoor pcb assembly GEES pcb is right Check outdoor TH Connect to CN TH1 in Measure resistance of TH Check soldering state of outdoor pcb assembly air about 10kQ at 25 C 77 F R03H RO6H C02H CO3H pipe about 5kQ at 25 C 77 F Copyright 2008 LG Electronics Inc All right reserved 49 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting Description Cause of error e Heat sink TH is damaged short or open Heat sink Temp is over 95 C 203 F e Heat sink Temp is over 95 C 203 F Heat sink TH a is open or short e Damage or defect on the sensing circuit of outdoor pcb assembly H RO1H RO2H C01H Check flow YES YES Heat sink TH is connected to Heat sink TH in INV IC is Sensing circuit of outdoor outdoor
41. l Use Only Only for training and service purposes Part4 Trouble Shooting E 18 24 30kBtu h Model Indoor Error Error code Descrition INV TPS LENI LENA iere Red Green Status 00 No Error e ON 01 Indoor Room themistor error o itime 9 OFF 02 Indoor in piping sensor error e 2times OFF 05 Communcation error between in and out e 5times OFF 06 Indoor Out Piping sensor error e 6times A OFF Outdoor Error Ex Error Code 21 IPM Fault 2 Times 2 Times 2 Times LED01G RED ig gt tga i leo 11 Sec i 4Sec 1 i1Sec i 1 Time i 1 Time LED02G GREEN LED01G LED02G Outdoor Contents Red Green Case of error Status IPM Fault Compressor Over current 2 times 1 time Compressor malfunction IPM Fault Off CT 2 Max Current 2 times Oh 2 times Current is 14A t Off DC Link Low Volt 2 times 3 times DC Link volt Is 140V 4 Off Low High press 2 times Q 4 times Low High press switch OPEN Off AC Low AC High Volt 2 times Q 5 times Abnormal AC volt Input Off DC Compressor Position 2 times 6 times Q PSC Fault 2 times Q 7 times Q DC Link High Volt 2 times Q 8 times Q Discharge Pipe Temp High INV 3 times Q 2 times Q Discharge Pipe Temp High Cons 3 times Q 3 times Q Copyright 2008 LG Electronics Inc All right reserved 47 Only for training and servic
42. l right reserved 35 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 2 way Valve Liquid Side 3 way Valve Gas Side Hexagonal wrench 4mm Flare nut Open position Closed position To piping connection To outdoor unit Shaft position Valve cap Open position Closed position Flare nut Pin To piping f l connection Service Service portcap port To outdoor unit Works Shaft position Service port Shippin Closed Closed Closed pping with valve cap with valve cap with cap Air purging Open Closed Open 1 Installation counter clockwise clockwise push pin or with vacumm pump Open Open Closed Operation p with valve cap with valve cap with cap Pumping down Closed Open Open 2 Transfering clockwise counter clockwise connected manifold gauge Evacuation Open Open Open 3 Servicing with charging cylinder Gas charging Open Open Open 4 Servicing with charging cylinder Pressure check Open 5 Servicing Open Open with charging cylinder Gas releasing Open 6 Servicing Open Open with charging cylinder Copyright 2008 LG Electronics Inc All right reserved 96 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting Purge the wal Outdoor unit e Procedure 1 Confirm that both the
43. lectronics Inc All right reserved 7 Only for training and service purposes LGE Internal Use Only a Part 2 Functions 4 Controls Te Listof Controls amp Functions diene Eu 9 2 Basic Mode Control ege ste gueeegerrser gees nioena sanaat aaaeeeaa atakua res iuda Piui e adunau 10 3 Special Mode GontrolS AANGAL ARINA NANANA 12 4 Utility FUNCOMS aaa AA AA AA AG 13 5 Protection Functions amp Conte mun nabaan an ANAKAN ILANG 16 Copyright 2008 LG Electronics Inc All right reserved 8 Only for training and service purposes LGE Intemal Use Only Part2 Functions 8 Controls Category Function Description Remark Cooling Mode Cooling operation Heating Mode Heating operation Basic mode EE h controls Healthy Dehumidification Dry operation Auto Changeover Cooling mode is automatically changed to heating mode and vice verse Jet Cool Powerful cooling mode Special Mode Jet Heat Powerful heating mode controls Energy saving Air volume amp set temp are automatically selected for saving energy in cooling mode Cooling Mode Only Utility Functions Forced operation Operation without remote controller Auto Clean After cooling operation this function makes the evaporator dry Air volume control Indoor Fan speed Control Natural Air control Air volume control Program Chaos Swing Vertical Airflow Direction control Sleep mode Auto control Air volume amp set temp
44. ll be off System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will start If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation occurs system stops and give error code If the temperature reached Toff condition system will count 5 times after that and system will stop with error code Heat Sink temp Toff 85 C 185 F T2 75 C 167 F T1 70 C 158 F COMP Set 5 Hz Set 5 Hz OFF Set Hz frequency Down frequency Down frequency Copyright 2008 LG Electronics Inc All right reserved 23 Only for training and service purposes LGE Internal Use Only Part2 Functions 8 Controls 5 9 Total Current Control Over Current Protection 5 9 1 9 12kBtu h Model 1 CT1 control e If the operating current reaches 11 the operating frequency of the compressor decreases e After decreasing the operating frequency by 1step if operating current is below 11 for 60 seconds continuously the operating frequency of compressor increases by 1step 2 CT2 control e If the operating current of the appliance reaches 12 the compressor stop instantly and two minutes later the compres sor restarts again e H CT2 occurs 5 times within one hour the appliance turn off and displays ERROR CODE 7 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 24
45. lugged D pi Constant Soldered poorly e Normal resistor a nplugge a KEE e Internal circuit error e Normal voltage 4 5VDC at 25 C 77 F plugged e Open Short 65 Heat sink sensor e Soldered poorly e Normal resistor 10kQ at 25 C 77 F Unplugged e Internal circuit error e Normal voltage 2 5VDC at 25 C 77 F 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 O kQ or then sensor is abnormal Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 64 If the voltage of the sensor is 0 V or 5VDC then sensor is abnormal LGE Internal Use Only Part4 Trouble Shooting Inverter Constant D Pipe R T Table Air R T Table Temperature C F Resistance kQ Temperature C F Resistance kQ 20 68 244 20 68 12 5 30 86 164 8 30 86 8 40 104 114 40 104 5 3 50 122 80 6 50 122 3 6 60 140 58 3 60 140 2 5 70 158 42 9 70 158 1 7 80 176 32 1 80 176 1 2 90 194 24 4 90 194 0 9 100 212 18 9 100 212 0 7 110 230 14 8 120 248 11 7 Condenser Suction Pipe Pipe R T Table Heatsink R T Table Temperature C F Resistance kQ Temperature C F Resistance kQ 20 68 6 3 20 68 12 5 30 86 4 30 86 8 40 104 2 6 40 104 5 3 50 122 1
46. nd and earthquake e In the case when the vibration of the unit is conveyed to the hose secure the unit with an anti vibration bushing Tubing connection Evaluation of the performance Operate unit for 15 20 minutes then check the system refrigerant charge 1 Measure the pressure of the gas side service valve 2 Measure the temperature of the intake and discharge air 3 Ensure the difference between the intake temperature and the discharge is more than 8 C 46 F Cooling or Heating a Discharge temperature 4 For reference the gas side pressure of optimum condition is as below Cooling Outside ambient The pressure of the gas side Refrigerant TEMP service valve R22 35 C 95 F 4 5kg cm G 56 8 71 0 P S I G R410A 35 C 95 F 8 5 9 5kg cm2G 120 135 P S I G Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes NOTE If the actual pressure is higher than shown the system is most likely over charged and charge should be removed If the actual pressure are lower than shown the system is most likely undercharged and charge should be added The air conditioner is now ready for use PUMP DOWN This is performed when the unit is to be relocated or the refrigerant circuit is serviced Pump Down means collecting all refrigerant in the outdoor unit without loss in refrigerant gas CAUTION Be su
47. nt 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 perform ventilation If the refrigerant gas comes in contact with a fire poisonous gas generates A case of leakage of the refrigerant and the closed room full with gas is dangerous because a short age of oxygen occurs Be sure to perform ventilation When removing the front panel or cabinet execute short circuit and discharge between high voltage capacitor terminals If discharge is not executed an electric shock is caused by high voltage resulting in a death or injury Do not turn the air conditioner ON or OFF by plugging or unplugging the power plug There is risk of fire or electrical shock OP e ec D Copyright 2008 LG Electronics Inc All right reserved 4 Only for training and service purposes LGE Intemal Use Only Part1 General Information 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 tightly and the cable should be routed properly so that there
48. operation if operating Hz couldn t be changed by safety control stop this operation Operating process Raise the operating HZ up to 70 and after 20 sec option recover to the last value Copyright 2008 LG Electronics Inc All right reserved 30 Only for training and service purposes LGE Intemal Use Only Part3 Test Run BW Part3 Test Run 1 Check before Test uni aa ANA SEAN 32 2 TESURUN FIOW chamba ANAN Nana ee Eege 33 3 lEStiRUN Detalll NA AA AA A ein a 34 Copyright 2008 LG Electronics Inc All right reserved 31 Only for training and service purposes LGE Internal Use Only Part3 Test Run 1 Check to see whether there is any refrigerant leakage and check whether the power or transmission cable is connected properly Check whether the liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Confirm that 500 V megger shows 2 0 MQ or more between power supply terminal block and ground Do not operate in the case of 2 0 MQ or less NOTE Never carry out mega ohm check over terminal control board Otherwise the control board may break Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground maydecrease to approx 2 0 MQ as a result of refrigerant accumulation in the internal compressor If the insulation resistance is less than 2 0 MQ turn on t
49. opyright 2008 LG Electronics Inc All right reserved 52 Only for training and service purposes LGE Intemal Use Only Description Part4 Trouble Shooting Cause of error CT2 Check flow YES Supplied voltage to Outdoor pcb is about AC 208 230V Check power source YES e Supplied power is not normal Over current Error e Indoor outdoor fan is locked e Too much refrigerant e Defect in current sensing circuit in outdoor pcb assembly YES Does indoor outdoor fan work normally Refrigerant pressure is right Check indoor outdoor fan and Check refrigerant pressure adjust and adjust Current sensing circuit is right Check current sensing circuit check CT is damaged in outdoor pcb output wire is disconnected to pin or not BDOIN is inserted in right position refer marking on pcb and component Spec of ROIN 1kQ RO2N 1 65kQ is correct Direction of diode DO1N DO2N is right Copyright 2008 LG Electronics Inc All right reserved 53 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting Description Cause of error Indoor fan is locked BLDC fan model only Check flow YES e Indoor fan is locked or separated e Fan connector is not connected to indoor pcb assembly e Defective in DC fan driving circuit YES Indoor fan is rotating 1 Indoor fan is rotating 2 DC fan driving circuit is right
50. ot suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes This is different from previous procedures Because you are charging with liquid refrigerant from the gas side absolutely do not attempt to charge with larger amounts of liquid refrigerant while operating the air conditioner 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while operating the air conditioner turn off the air conditioner before disconnecting the hose 5 Mount the valve stem nuts and the service port nut Use torque wrench to tighten the service port nut to a torque of 1 8 kg m Be sure to check for gas leakage 39 LGE Internal Use Only Part4 Trouble Shooting Trouble analysis 1 Check temperature difference between intake and discharge air and operating current Temp difference approx 0 C 1 F m Current less than 80 of rated current Temp Difference Temp difference approx 8 C 16 F Current less than 80 of rated current Operating Current Temp difference less than 8 C 16 F Current near the rated current Temp difference over 8 C 16
51. re to perform Pump Down procedure with the unit in cooling mode Pump Down Procedure 1 Connect a low pressure gauge manifold hose to the charge port on the gas side service valve 2 Open the gas side service valve halfway and purge the air from the manifold hose using the refrigerant gas 3 Close the liquid side service valve all the way in 4 Turn on the unit s operating switch and start the cooling operation 5 When the low pressure gauge reading becomes 1 to 0 5kg cm G 14 2 to 7 1 P S I G fully close the gas side valve stem and then quickly turn off the unit At that time Pump Down has been completed and all refrigerant gas will have been collected in the outdoor unit 5 Check operating current 6 Change operation mode and check 34 LGE Internal Use Only Part4 Trouble Shooting P Part4 Trouble Shooting 1 2 Way EVA IC 36 2 PUMIDINIG HR WEE 37 3 Evacuation All amount of refrigerant leaked 1 000manu nanan unananuunasunanusunwanana 38 4 Gas Charging After Evacuation cccccceseecseesseeeeeeeeeenenseeeneseeeeeneeeseneaseeeeseeneneeneanees 39 5 Cycle Troubleshooting Gulden caiicscassssisescescecscencsssaisvesceentectendesiecceedsescendeviendundseacerntewaie 40 6 Electronic Parts Troubleshooting Guide eccseceseseseesseeseneeseeeseneeseeeeseeessenseeeneenees 41 Te Self diagnosis EH rett eege eegene Neben 46 Copyright 2008 LG Electronics Inc Al
52. right 2008 LG Electronics Inc All right reserved 2 Only for training and service purposes LGE Intemal Use Only g Part1 General Information T Safety PVECAUTONS E 4 2 Nomenclaluk pu mana dE ERR SEeE Ee BANAS 7 Copyright 2008 LG Electronics Inc All right reserved 3 Only for training and service purposes LGE Internal Use Only Part1 General Information To prevent injury to the user or other people and property damage the following instructions must be followed E Incorrect operation due to ignoring instruction will cause harm or damage The seriousness is classified by the follow ing indications AWARNING This symbol indicates the possibility of death or serious injury ACAUTION This symbol indicates the possibility of injury or damage to properties only E Meanings of symbols used in this manual are as shown below D Be sure not to do Q Be sure to follow the instruction AN Dangerous Voltage 1 1 Cautions in Repair AWARNING Be sure to disconnect the power cable plug from the plug socket before disas sembling the equipment for a repair Internal components and circuit boards are at main potential when the equipment is connected to the power cables This high voltage is extremely dangerous and may cause death or severe injury if come in contact with it Do not touch the discharging refrigerant gas during the repair work The discharging refrigerant gas The refrigera
53. t is reset to those of the initial cooling mode and then operate so that the air outflow could reach further 3 2 Jet Heat operation e While in cooling mode or Fuzzy operation the Jet Heat function does not work When it is input while in the Heating mode operation dehumidification the Jet Heat mode operation takes place e In the Jet Heat mode the indoor fan operated at super high speed for 60 min at Heating mode operation e In the Jet Heat mode the room temperature is maintained at a temperature of 30 C 86 F e When the sleep timer mode is input during the Jet Heat mode operation the Jet Heat mode has the priority e When the Jet Heat button is pressed the horizontal vane of the unit is the unit reset to those of the initial Jet heating mode and then operates so that the air outflow could reach under flow 3 3 Energy saving operation in cooling mode e During cooling and dehumidification mode of operation the Energy saving button can be input e In this operation before we feel cold the set temperature and air volume is set automatically to save energy Copyright 2008 LG Electronics Inc All right reserved 212 Only for training and service purposes LGE Intemal Use Only Part2 Functions 8 Controls 4 1 Forced operation e To operate the appliance manually in case when the remote control is lost the forced operation selection switch is on the main unit of the appliance and operate the appliance in the standard conditions
54. ting operating time And Heating operating t ime 40 minutes Option 2 Minimum Time Of Heating Setting Freq Bee 5seci Operating Freq Of Comp Comp off Inapplicable Operating Freq Of Comp Comp off Applicable Setting Freq The Degree of Superheat EEV Control Open step 4 Way Setting Speed Indoor FAN Setting Speed Indoor FAN Pre Heat LED Deice STEP 30 Main Deice time 30sec 10sec i Model kBtu h Compressor Frequency 25 1min Setting Freq Starting Step Hi Speed Hot Setting Speed i Super low speed o low speed 9 65Hz Step 5 12 Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 80Hz Step 5 18 LGE Internal Use Only Part2 Functions 8 Controls 5 5 2 18 24 30kBtu h Model e Starting to the defrosting operation 1 Defrost operation will be start when the conditions below are matched a Accumulation time of operation and the period after completion of defrost 35 min b After 10 minutes from re starting the compressor In case of being over 35 minutes of accumulated operating time defrosting operation starts after 10 minutes c Piping temperature of the outdoor heat exchanger maintain below defrost starting temperature for 4 minutes after 35 minutes continuous operation d In case of passing 10 minutes after oil recovery operation 2
55. tion of comp wire U V W e Malfunction of compressor Position iti position detect error Check the component of IPM detection parts Check the Reactor spec 18k 30k 10A 26 8mH 24k 13A 13mH 2 27 PSC Fault e Over current at IGBT Check AC input voltage Check outdoor fan locking operating Check input current Check Point e CH 26 e CH 27 Check the connection of U V W Check the IGBT short point B Check the short check point A Check with the error code 21 Copyright 2008 LG Electronics Inc All right reserved 62 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 8 Troubleshooting CH32 CH33 CH40 pata Title Cause of error Check point 4 Normal condition D pipe Inverter e Check the discharge pipe sensor for INV 32 temp high e Discharge sensor e Check the install condition for over load 105 C 221 F Inverter temp high e Check the leakage of refrigerant 1 e Check the SVC V V open D pipe Constant e Check the discharge pipe sensor for Cons temp high e Discharge sensor e Check the install condition for over load 33 105 C 221 F 1 Cons temp high e Check the leakage of refrigerant e Check the SVC V V open e Open Short 40 CT Sensor e Soldered poorly e Normal resistor about 02 e Internal circuit error D Pipe temp Toff 105 C 221 F T2 95 C 203 C T1 90
56. water at IPM part gt Check the trace of water 6 Check the IPM circuit Copyright 2008 LG Electronics Inc All right reserved Only for training and service purposes 58 LGE Internal Use Only Part4 Trouble Shooting 4 Troubleshooting CH21 CH22 Error F re parad Title Cause of error Check point amp Normal condition Check the compressor locking Check the compressor insulation and motor wire Compressor output 21 DC Peak S resistance cient Oven ORs Check outdoor fan locking operating Check the IPM short Check AC input voltage Check outdoor fan locking operating C T NM Check input current 22 d Bee Initial current error Check the CO1N DC voltage From the condition where the electricity is entering and Before the product operates Normality Vdc value is 2 5V 0 2V CTOIN Check Point 1 Check the power source 2 Check the fan operation is right 3 Check the current 4 Check the install condition 5 Check the internal circuit Copyright 2008 LG Electronics Inc All right reserved 59 Only for training and service purposes LGE Internal Use Only Part4 Trouble Shooting 5 Troubleshooting CH23 CH28 paba Title Cause of error Check point 4 Normal condition 23 DC Link e DC link volt is e Check the power source Low voltage 140VDC e Check the DC Link Voltage DC Link e DC link volt is e Check the power sour

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