LG Multi-Inverter Type Service Manual Download

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4. Trouble Shooting

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Summary of Contents for Multi-Inverter Type

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

Page 2: ...e 11 Part 2 Functions Controls 13 1 List of Functions Controls 14 2 Air Flow 16 3 Air Purifying 18 4 Installation Functions 19 5 Reliability 23 6 Convenience Functions Controls 24 7 Special Function KIT 36 Part 3 Test Run 39 1 Check before Test Run 40 2 Test Run Flow chart 41 3 Test Runing 42 Part 4 Trouble Shooting Guide 45 1 Self diagnosis Function 46 2 Pump Down 50 3 Evacuation 51 4 Gas Chargin...

Page 3: ... 2 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 1 Safety Precautions 3 2 Model Line Up 6 3 Nomenclature 11 Part 1 General Information ...

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

Page 5: ... ventilated place Using the welder in an enclosed room can cause oxygen deficiency Be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred Do not use a defective or underrated circuit breaker Use the correctly rated breaker and fuse Otherwise there is a risk of fire or electric shock Install the panel and the cover of control box securely Otherwise t...

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

Page 7: ...s Capacity kW kBtu h Chassis Wall mounted ART COOL Mirror 4 way Ceiling cassette S4 AMNH07GD4L0 MS07AH N40 AMNH12GD4L0 MS12AH N40 S5 AMNH18GD5L0 MS18AH N50 AMNH24GD5L0 MS24AH N50 AMNH07GDZ 0 MC07AH NZ1 AMNH12GDU 0 MC12AH NU1 AMNH18GD3 0 MC18AH N31 AMNH24GD3 0 MC24AH N31 SE S8 AMNH09GDE 1 MC09AH NE1 AMNH18GD8 1 MC18AH N81 AMNH24GD8 1 MC24AH N81 AMNH07GDE 1 MC07AH NE1 AMNH12GDE 1 MC12AH NE1 TC1 AMNH...

Page 8: ...atic pressure Slim Category Type Model names Capacity kW kBtu h Chassis 2 05 7 2 64 9 3 52 12 5 28 18 7 03 24 BH AMNH186BHA0 MB18AH NH0 AMNH246BHA0 MB24AH NH0 Low static pressure BT AMNH096BTG0 MB09AHL NT0 AMNH126BTG0 MB12AHL NT0 AMNH186BTG0 MB18AHL NT0 Built in BP AMNH096BPA0 MB09AHB NP0 AMNH126BPA0 MB12AHB NP0 VE AMNH096VEA0 MV09AH NE0 AMNH126VEA0 MV12AH NE0 VB AMNH186VBA0 MV18AH NB0 AMNH246VBA0...

Page 9: ... 8 79 indoor units kBtu h 21 24 30 Power supply 1ø 220 240V 50Hz Chassis 2 2 Outdoor units Heat pump A3UW216FA3 FM21AH UE3 A4UW246FA3 FM25AH UE3 A4UW276FA3 FM27AH UE3 No of connectable indoor units Max 3 Max 4 Total capacity index of connectable kW 9 67 11 4 12 0 indoor units kBtu h 33 39 41 Power supply 1ø 220 240V 50Hz Chassis Heat pump A5UW306FA3 FM30AH UE3 A5UW406FA3 FM38AH UH3 No of connectab...

Page 10: ...ts kBtu h 46 54 62 Power supply 3ø 380 415V 50Hz Chassis Heat Pump A9UW548FA3 FM57AH U33 No of connectable indoor units Max 9 Number of BD units to be connected Max 3 Total capacity index of connectable kW 21 4 indoor units kBtu h 73 Power supply 3ø 380 415V 50Hz Chassis 3 phase Heat Pump A7UW406FA3 FM40AH UH3 A8UW486FA3 FM48AH U33 A9UW566FA3 FM56AH U33 No of connectable indoor units Max 7 Max 8 M...

Page 11: ...d service purposes LGE Internal Use Only No of connectable indoor units Max 2 Max 3 Max 4 Model name PMBD3620 PMBD7220 PMBD3630 PMBD7230 PMBD3640 Connectable indoor unit capacity kW 2 05 7 03 5 28 10 6 2 05 7 03 5 28 10 6 2 05 7 03 kBtu h 7 24 18 36 7 24 18 36 7 24 BD unit 2 3 BD Branch distributor units ...

Page 12: ...ling floor Function A Basic L Nano plasma Wall Mounted C Plasma ceiling cassette G Low static motor ART COOL Mirror type front panel color B Blue C Cherry D Wood M Metal R Mirror V Silver W White wood E Red G Gold H White Silver 1 KISS Indicates that this is multi system outdoor unit using R410A Ex A4U Connectable max 4 indoor units A6U Connectable max 6 indoor units Model type W DC inverter heat ...

Page 13: ... refrigerant A R410A Cooling heating capacity Ex 7 000 Btu h 07 18 000 Btu h 18 Type of indoor units S Wall mounted A ART COOL C ART COOL Mirror B Ceiling concealed duct T Ceiling cassette V Ceiling Floor Model type M Multi type air conditioner FM 19 A H Model Ttype C Cooling only H Heat pump Type of refrigerant A R410A Cooling heating capacity Ex 18 000 Btu h 18 48 000 Btu h 48 Model type FM Free...

Page 14: ... E S P External Static Pressure Setting 19 4 2 High Ceiling operation 22 5 Reliability 23 5 1 Hot start 23 5 2 Self diagnosis Function 23 5 3 Soft dry operation 23 6 Convenience Functions Controls 24 6 1 Auto changeover operation 24 6 2 Auto cleaning operation 28 6 3 Auto Operation Fuzzy Operation 29 6 4 Auto restart Opeartion 30 6 5 Child Lock Function 31 6 6 Forced operation 31 6 7 Group Control...

Page 15: ...ction control Indoor Fan speed Control Indoor Fan speed Control by chaos pattern Powerful cooling mode Distribute stir the Air inside Air filtration using Deodorizing filter Air filtration using plasma filter Air filtration using pre filter Drain water pump Changeable External Static Pressure Electric heater Function to Control the Air Volume by Ceiling Height To prevent cold wind blow on heating ...

Page 16: ...rt Optional Test function Category Function Description Remark Network Solution LGAP PDI power distribution indicator Network control using PI 485 Internet control the operation of the Air conditioning unit where each zone For operation at low temp Vanes angle can be controlled by pair Grille is automatically down to clean Condenser frost prevention Detect high pressure for safety Detect low press...

Page 17: ...flow direction control key input the left right louver automatically operates with the auto swing or it is fixed to the desired direction 2 2 Auto swing up down By the auto swing key input the upper lower vane automatically operates with the auto swing or it is fixed to the desired direction 2 3 Chaos swing up down By the Chaos swing key input the upper lower vane automatically operates with the c...

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

Page 19: ...stem not only removes microscopic contaminants and dust but also removes house mites pollen and pet fur to help prevent allergic diseases like asthma This filter that can be used over and over again by simply washing with water 3 Air purifying Ionizer Photo Catalyst Coated Mesh Dust particles Odour Dust electrode discharge Odour molecule Generating plasma Polluted Air Purified fresh Air 4 8KV disc...

Page 20: ...lt set With Zone System 1 Position V H Maximum E S P setting Fan speed is varied according to the state of dampers by micom 2 Position F H Maximum E S P setting Fan speed doesn t vary according to the opening closing of dampers 3 Position V L Minimum E S P setting Fan speed is varied according to the state of dampers by micom Maximum 8mmAq Minimum 0mmAq 4 1 3 Move the slide switch to set position ...

Page 21: ...ost Filter Humidify Out door Set no Time 01 03 05 07 09 11 13 15 17 19 21 23 FAN SPEED HI Time SUB FUNCTION SET TEMP OPERATION AUTO SWING Preheat ZONE Operation unit Program set Room T MED LO AUTO JET Heater Defrost Filter Humidify Out door Set no Time emp 01 03 05 07 09 11 13 15 17 19 21 23 FAN SPEED HI 2 Timer 1 2 3 5 4 Timer Push the On Off button The unit will start Push the Timer and Wind but...

Page 22: ... 114 7 5 CMM 69 77 88 99 110 15 CMM 90 97 105 114 122 13 5 CMM 82 90 99 109 119 11 5 CMM 75 84 93 103 114 17 CMM 110 117 125 129 15 CMM 100 107 115 121 127 13 5 CMM 90 97 105 114 122 AMNH09GB1A0 1 MB09AHL N10 1 AMNH12GB1A0 1 MB12AHL N10 1 AMNH18GB2A0 1 MB18AHL N20 1 AMNH24GB2A0 1 MB24AHL N20 1 E S P setting value reference Static pressure mmAq 0 2 4 Model name Step Hi Med Lo Setting value 10 5CMM ...

Page 23: ...ust low rpm of indoor fan motor On the other hand if the height of the installation is high you can adjust high rpm of indoor fan motor Selection of speed can be done by slide switch at the back of the LCD wired remote Installation on the normal height ceiling installation on the higher ceiling Elevation Choice Conditions of Release Low Standard Hi When the elevation is low lower than 2 4m in heig...

Page 24: ...ooting guide 5 3 Soft dry operation When the dehumidification operation input by the remote control is received the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature While compressor off the indoor fan repeats low airflow speed and stop While the intake air temp is between compressor on temp and compressor off temp 10 min dehumidif...

Page 25: ... conditioner changes the operation mode automatically to keep indoor temperature When room temperature vary over 2 C with respect to setting temperature air conditioner keeps the room tempera ture in 2 C with respect to setting temperature by auto change mode SET Temp 0 5 C 0 5 C 2 C 4 C 2 C Cooling operation Heating operation Cooling operation Cooling thermo off Heating thermo off Switching point...

Page 26: ...ds on the load condition like the difference between the room temp and the set temp frequency restrictions If the compressor operates at some frequency the operating frequency of compressor cannot be changed within 30 seconds not emergency conditions Compressor turned off when intake air temperature is in between 0 5 C of the setting temp limit for three minutes continuously intake air temperature...

Page 27: ...temperature reaches 4 C above the setting temperature Condition of compressor turned on When intake air temperature reaches 2 C above the setting temperature Condition of indoor fan turned off While in compressor on indoor pipe temp 20 C While in compressor off indoor pipe temp 30 C While in defrost control between the indoor and outdoor fans are turned off Compressor 2minutes delay After compress...

Page 28: ...door unit Heat Exchanger temperature 1min Minimum 3min 1min 3min Setting fan speed Setting fan speed Setting fan speed ON ON ON ON Low Low Low Low Low Lo Off Off Off ON OFF OFF Low fan during 10sec A A B B Intake Air Temperature Compressor off interval While the indoor Heat Exchanger temperature is higher than 40 C fan operates at low speed when it becomes lower than 40 C fan stops For eluminating...

Page 29: ...d bad odor Used after the Cooling Operation before turning the unit off clean the Evaporator and keep it dry for the next opera tion The function is easy to operate as it is accessed through the Remote controller Unit Operation 13 14 minutes 1 minute 2 3 minutes ON OFF Comp Indoor Fan ON OFF ON OFF Setting step OFF L Low Setting step Unit Operation ON OFF Comp Indoor Fan ON OFF ON OFF Setting step...

Page 30: ...ke Air Temp 25 C 24 C Intake Air Temp 26 C Intake Air Temp 1 C 22 C Intake Air Temp 24 C Intake Air Temp 0 5 C 18 C Intake Air Temp 22 C Intake Air Temp Intake Air Temp 18 C 18 C When the Fuzzy key Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automati...

Page 31: ...ey Temperature Control key is input after the initial setting temperature is selected the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically accord ing to the Fuzzy rule While in Fuzzy operation the airflow speed of the indoor fan is set to the high or the medium according to the intake air temperature and the setting temperatur...

Page 32: ...ion and will be indicated as CL on the indication monitor At that time remote control doesn t switch to the selected mode and CL appears on the indication monitor for 3 seconds if you press another button However it normally performs the actions of the room temperature indication function and wireless remote control 1 Press the preset and minute setup button over 3 seconds at the same time In that...

Page 33: ...s linked to each of the indoor equipments for communication A specific control device is connected to each of them and this control device can control the same function Group control function is enabled by cutting an optional jump wire in the wired remote control At this time the main system will not respond in order to prevent data collision While executing group control command use the random da...

Page 34: ...ion unit ZONE 1 2 3 4 Humidify JET AUTO AUTO SWING OPERATION FAN SPEED Program set SUB FUNCTION SET TEMP Room Temp HI MED LO Heater Defrost Filter Preheat Out door Time Timer On Set no Time Off 01 03 05 07 09 11 13 15 17 19 21 23 Indoor Unit 1 Terminal Local Supply Block Terminal Local Supply Block Terminal Local Supply Block Main PCB 1 Main PCB 2 Main PCB 16 Wired Remote Controller Slide Switch O...

Page 35: ...ance starts to operate The timer LED is on when the on timer is input It is off when the time set by the timer is reached If the appliance is operating at the time set by the timer the operation continues While in Fuzzy operation the airflow speed of the indoor fan is automatically selected according to the temperature 6 9 2 Off Timer Operation When the set time is reached after the time is input ...

Page 36: ...by the thermistor of the main body Position 2 The room themperature is controlled by the thermistor of the wired remote controller control the temperature according to the position of wired remote controller Position 3 The room temperature is controlled by lower temperature between the temperature of main body and of remote controller sensor 6 11 3 Move the slide switch to set position 6 11 4 Clos...

Page 37: ...ditioning 7 Special Function KIT Zone control sub PCB ABZCA Room1 Thermostat Damper Motor Damper Motor Damper Motor Damper Motor Room2 Thermostat Room3 Thermostat Room4 Thermostat 7 2 Low Ambient control This Function is for cooling operating in outdoor low temperature If outdoor temperature drops below certain temperature liquid back is prevented by reducing outdoor fan speed It can prevent frost...

Page 38: ...tion Grille makes you cleaning the filter easily ELEVATION GRILL REMOTE CONTROLLER_Accessory How to Use Remote Controller Main Components of Lift Grill As for operation of Remote Controller use it by directing the trans mitter part of Remote Controller to the receiver part of front panel directly under front panel Do not drop it down or into water Or else there is worry about trouble failure Do no...

Page 39: ...ic Stop Distance of Grill Ceilingheight Low Medium High Height 3 4m Automatic stop distance 1 5 0 5m 2 5 0 5m 3 5 0 5m Depress the down button Then suction grill descends and stops automatically at a certain distance You may stop it at wanted distance point by depressing the stop but ton when descending Depress the up button Then suction grill goes up and enters into the front panel 1 Stop the Air...

Page 40: ...Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 3 Test Run 3 Test Run 1 Check before Test Run 40 2 Test Run Flow chart 41 3 Test Running 42 ...

Page 41: ...e between power supply terminal block and ground Do not operate in the case of 2 0 MΩ 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 app...

Page 42: ...tart Refer to part4 6 Electric part Yes No Yes Refer to part4 5 Cycle part No Is hot air discharged After Hot Start Yes No Is there any temperature difference between intake and discharged air Yes No Is the operating current normal Yes Normal Refer to Troubleshooting Guide No Check the load In Out Temp Check pipe length and amount of refrigerant Check for abnormal sound in outdoor unit comp Fan ot...

Page 43: ...d 18 minutes later auto matically The forced operation is started by pressing button for 2 seconds Cassette Type The test run is started by pressing button for 5 sec onds Cassette Type The test run is started by pressing timer cancel button five times continuously Room type To cancel the test run press any button 3 1 3 Settlement of outdoor unit Anchor the outdoor unit with a bolt and nut ø10mm ti...

Page 44: ...he BOTTOM state 2 In case the indoor unit is installed under the ceiling please change the slide switch which is on the Main PCB Assembly to the CEILING state The initial state of the slide switch is set for the bottom installation 3 2 1 Connection of power supply 1 Connect the power supply cord to the independent power supply Circuit breaker is required 2 Prepare the remote control Insert two bat...

Page 45: ...n and down timer button for 3 seconds at the same time To cancel the test run press any button 3 3 2 CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE After completing work be sure to measure and record trial run properties and store measured data etc Measuring data are room temperature outside temperature suction temperature blow out temperature air velocity air volume voltage current prese...

Page 46: ...nc All right reserved Only for training and service purposes LGE Internal Use Only 4 Trouble Shooting 4 Trouble Shooting 1 Self diagnosis Function 46 2 Pump Down 50 3 Evacuation 51 4 Gas Charging 52 5 Cycle Part 53 6 Electronic Parts 54 ...

Page 47: ...r number of error code is first displayed After error occurs if error is released error LED is also released simultaneously 1 Time 1 Time 1 Time 2 Times 2 Times 2 Times 10 digit LED 1 digit LED 1 Sec 2 Sec 2 Sec 1 Sec 1 Sec 1 digit 10 digit Ex Error 21 DC Peak 1 2 Indoor Error Case of error Contents Error code Open Short Outlet pipe sensor 06 Different operation mode Different operation mode 07 Co...

Page 48: ...rrent 2times 9times Over Inverter Compressor Current Off 31 CT Error 3times 1time Low Current Off 32 D Pipe High INV 3times 2times Off Off 33 D Pipe High Normal 3times 3times Off Off 40 CT Sensor Open Short 4times O CT Circuit Malfunction Off 41 INV D Pipe Th Error 4times 1time Open Short Off 44 Outdoor Air Th Error 4times 4times Open Short Off 45 Cond Pipe Th Error 4times 5times Open Short Off 46...

Page 49: ...n Pump error 4times OFF 05 Communcation error between in and out 5times OFF 06 Indoor Out Piping sensor error 6times OFF 07 Differnt mode operation 7times OFF Outdoor Error 21 DC Peak IPM Fault 2times 1time Off 22 CT 2 Max CT 2times 2times Off 23 DC Link Low Volt 2times 3times Off 24 L_P H_P Switch 2times 4times Off 25 Low Voltage Over Voltage 2times 5times Off 26 DC Compressor Position Error 2tim...

Page 50: ...EPROM Check Sum Error 6times O Off 61 Cond Pipe Th High 6times 1time Off 62 Heatsink Th High 6times 2times Off 63 Cond Pipe Th Low 6times 3times Off 65 Heatsink Th Error Open Short 6times 5times Off 67 Outdoor BLDC Fan Lock 6times 7times Off 73 PFC Fault Error S W 7times 3times Off Error code Description LED 1 Red LED 2 Green Indoor Status ...

Page 51: ...ush 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 6 Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the 3 way valve to the closed position Do this quickly so that the gauge ends up indi cat...

Page 52: ...moved toward 0 8Torr 3 Close the valve Lo side on the charge set turn off the vacuum pump and confirm that the gauge needle does not move approxima tely 5 minutes after turning off the vacuum pump 4 Disconnect the charge hose from the vacuum pump Vacuum pump oil If the vacuum pump oil becomes dirty or depleted replenish as needed Lo Open Open Vacuum pump 3 Way valve Outdoor unit Liquid side Indoor...

Page 53: ...ge 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 not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from th...

Page 54: ...nce between intake and discharge air depends on room air humidity When the room air humidity is relativery higher temperature difference is smaller When the room air humidity is relatively lower temperature difference is larger 2 Check temperature and pressure of refrigeration cycle in cooling mode 1 The suction pressure is usually 8 5 9 5kg cm2G Cooling at normal condition R410A 2 The temperature...

Page 55: ...edy 1 Check the power outlet 2 Replace P C B Ass y 4 Replace P C B Ass y 5 Replace P C B Ass y Turn on the main power again Turn off the main power and wait for 10 seconds Yes No A Beeping sound is made from the indoor unit Check the voltage of power supply AC220V AC240V 50Hz and check for the following The voltage of main power supply The voltage applied to the unit The connecting method of Indoo...

Page 56: ...s made from the indoor unit Refer to 10 1 Check the voltage of power AC220V AC240V 50Hz Is it possible to turn on the unit by ON OFF button on display Yes No Is the remote controller working properly Yes When the mark is displayed in LCD screen replace battery No Check the contact point of CN DISP 1 2 connector Re connector Check display P C B Assembly Voltage between CN DISP1 should be DC 5V If p...

Page 57: ...in bad connection or are not engaged Compressor Outdoor fan is stopped Check the related circuit of R02H 12 1K R01H 1K R04H 6 2K R03H 1K C01H 102 C02H 102 Micom pin No Check the Indoor temperature sensor is disconnected or not about 10K at 25 C Check the Relay RY PWR RY START for driving Compressor Check the voltage between brown and blue cable of terminal to connect the Outdoor About AC220V 240V ...

Page 58: ...in power Check the connection of CN FAN Check the Fan Motor Check the Fuse AC250V T2A Turn on the main power Check the related circuit of indoor Fan Motor The pin No 38 of micom and the part for driving SSR Q01M Check the related pattern Check the SSR SSR Open Indoor Fan Motor never operate SSR short Indoor Fan Motor always operates in case of ON or OFF The voltage of Pin No 1 orange and 3 black o...

Page 59: ...onnector Check the soldering condition on PCB of CN U D or CN0L R Connector Check the operating circuit of the vertical louver Confirm that there is DC 12V between pin of CN U D CN0L R and GND Confirm that there is a soldering short at following terminals Between 1 2 3 and 4 of MICOM Between 17 18 19 and 20 of MICOM Between 4 5 6 and 7 of IC01M Between 5 6 7 and 8 of IC01M 6 5 When the louver does...

Page 60: ...ged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Display code Title Cause of error Check point Normal condition 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 resi...

Page 61: ...g connection Connection of wire Main PCB Volt DC12V Noise interference Display code Title Cause of error Check point Normal condition 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 o...

Page 62: ...Drain pump Float switch Drain pump power input 220V Drain tube installation Indoor unit installation Inclination Display code Title Cause of error Check point Normal condition 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 Normal short Check the float switch 3 Check the level of water 4 Check...

Page 63: ...D Transmission circuit of outdoor PCB is abnormal Transmission circuit of indoor PCB is abnormal Display code Title Cause of error Check point Normal condition 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 ...

Page 64: ...tion 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 Display code Title Cause of error Check point Normal condition 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 le...

Page 65: ...r Malfunction of compressor Blocking of pipe Low voltage input Refrigerant pipe length blocked Malfunction of current detection circuit Open Short The voltage of C01N Is 4 0Vdc 25A Display code Title Cause of error Check point Normal condition 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 C T D...

Page 66: ...ing V 23 28 DC Link Low voltage DC Link High voltage DC link volt is 140Vdc DC link volt is 420Vdc Check the power source Check the components Check the power source Check the components Display code Title Cause of error Check point Normal condition Check Point 1 Check the power source 2 Check the components B Diode Reactor PSC Parts ...

Page 67: ...ormal Input voltage 140Vac 300Vac Check the connection of CN_Press Check the components Check the power source Check the components Display code Title Cause of error Check point Normal condition Check Point CH 24 1 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 25 1 Check the power source 2 Check the compo...

Page 68: ...rrent at IGBT Check the connection of comp wire U V W Malfunction of compressor Check the component of IPM detection parts Check the component of IGBT Check the components Display code Title Cause of error Check point Normal condition Check Point CH 26 1 Check the connection of U V W 2 Check the insulation of IPM part 3 Check the compressor same with CH21 CH 27 1 Check the component of IGBT 2 Chec...

Page 69: ...ischarge pipe sensor for INV Check the install condition for over load Check the leakage of refrigerant Check the SVC V V open 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 Display code Title Cause of error Check point Normal condition Check Point CH 32 1 Check the install condition for over load 2 Check t...

Page 70: ...r Normal resistor 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resistor 10KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resist...

Page 71: ...indoor unit capacity Check the combination table Check the PCB ASM P No Check the poor soldering Display code Title Cause of error Check point Normal condition Check Point CH 51 1 Check the indoor unit capacity CH 60 1 Check the insertion condition of EEPROM 2 Check the poor soldering Model Gross max capacity Max single indoor unit capacity A2UW146FA3 21k A2UW166FA0 A2UW166FA1 24k 12k A3UW186FA0 A...

Page 72: ...nk sensor detected high temp 85 C Check the load condition Check the sensor of Condenser pipe sensor Check the fan is locked Check the sensor of heat sink Display code Title Cause of error Check point Normal condition Check Point CH 61 1 Check the install condition for over load Refrigerant Pipe length Blocked CH 62 1 Check the fan is locked 2 Check the Outdoor temp is very high COMP Frequency Hz ...

Page 73: ...e connection of wire Confirm the wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly con nected 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 ...

Page 74: ...mality found 1 Check resistance between each terminal of compressor 0 34 0 35 7 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wirin...

Page 75: ...s after main power OFF otherwise it may cause electrical shock 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...

Page 76: ... LED 01M 02M turned off wait 7 minutes after main power OFF otherwise it may cause electrical shock 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 t...

Page 77: ...sembly power connection normal No Check connection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Yes Is input voltage normal No Check L N phase is 220V 15 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly Are the resi...

Page 78: ...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 CT Sensing Check Point Inverter PCB ...

Page 79: ...ting DC Link voltage 280V At Comp operating DC Link voltage 340V Display code Title Cause of error Check point Normal condition Error Diagnosis and Countermeasure Flow Chart Is Inverter PCB assembly Power connection normal No Check connection from terminal block to Inverter PCB assembly CN L CN N Yes Is input voltage normal No Yes Is Inverter PCB Normal No Replace inverter PCB assembly Recheck pow...

Page 80: ...the WCN_P L P N Connection condition at the Main PCB Refer to outdoor wiring diagram 2 Check the DC Link voltage at not operating 280V 3 Check the DC Link voltage at Comp operating 340V 4 Check DC Link Sensing Signal 2 4 2 8V Refer the Picture Vdc Main PCB DC Link Voltage Check Point DC_LINK Sensing Check Point Input Power Source Check Point 27 30 40k Vdc ...

Page 81: ...tronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Vdc Vdc Inverter PCB DC Link Voltage Check Point Connection Check Point GND GND GND GND DC_LINK Sensing Check Point N N 48 56k L L DC_LINK DC_LINK DC_LINK ...

Page 82: ...itch connector connected to PCB No Connect securely Is high pressure switch connector short during off time Yes No Is this error appeared again after reset Yes No Is SVC valve open Yes Re check momentary problem or not Open SVC valve No Yes Replace high pressure switch Is high pressure more than 2500kPa at manifold gauge No Replace PCB Yes Is high pressure of LGMV similar as at manifold gauge No R...

Page 83: ...ervice purposes LGE Internal Use Only Check Point 1 Check the connection of H press switch 2 Check short or not at the connector of high pressure switch Normal open Main PCB Connection Check Point Checking the Press switch Main PCB Connection Check Point Checking the H press switch 27 30 40k 48 56k ...

Page 84: ...put voltage 2 5Vdc 10 25 Input voltage Abnormal Input voltage 140Vac 300Vac Check the power source Check the components Display code Title Cause of error Check point Normal condition Is Inverter PCB Normal No Replace inverter PCB assembly Is input voltage normal No Check L N Voltage is 220V 15 Yes Input Power Source Check Point Recheck power and installation condition Yes Error Diagnosis and Count...

Page 85: ...tronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Inverter PCB Input Voltage Sensing Check Point GND GND INPUT V INPUT V INPUT V Inverter PCB Input Voltage Sensing Check Point 27 30 40k 48 56k Vdc Vdc GND ...

Page 86: ...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 Are the resistance Between each phase and insulation resistance of Inverter compressor norm...

Page 87: ... Diagnosis and Countermeasure Flow Chart No 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 installation condition normal Is compressor Wire connection condition normal 1 Check inverter PCB assembly U V W connector connection condition 2 Check wi...

Page 88: ...pplied over 420V 1 Input voltage abnormal L N 2 ODU inverter PCB damage DC Link voltage sensing part Display code Title Cause of error Check point Normal condition Is Inverter PCB assembly Power connection normal Check connection from terminal block to Inverter PCB assembly CN L CN N Yes Is input voltage normal No No Yes Is Inverter PCB Normal No Replace inverter PCB assembly Recheck power and ins...

Page 89: ...e CN_ L CN_ N Connection condition at the Inverter PCB Refer to outdoor wiring diagram 2 Check the DC Link voltage at not operating 280V 3 Check the DC Link voltage at Comp operating 340V 4 Check DC Link Sensing Signal 2 4 2 8V Refer the Picture Vdc Main PCB DC Link Voltage Check Point DC_LINK Sensing Check Point Input Power Source Check Point 27 30 40k Vdc ...

Page 90: ...tronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Vdc Vdc Inverter PCB DC Link Voltage Check Point Connection Check Point GND GND GND GND DC_LINK Sensing Check Point N N 48 56k L L DC_LINK DC_LINK DC_LINK ...

Page 91: ...EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Yes Is input voltage normal No Check L N phase is 220V 15 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly Are the resistance Between each phase and insulatio...

Page 92: ... 10 Is Inverter PCB Normal No Replace inverter PCB assembly Is input voltage normal No Check L N Voltage is 220V 15 Yes Input Power Source Check Point Recheck power and installation condition Yes Error Diagnosis and Countermeasure Flow Chart 40 C T Sensor Error Initial current error Malfunction of current detection circuit Open Short Check CT Sensor output voltage 2 5Vdc 5 Display code Title Cause...

Page 93: ...G Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Inverter PCB CT Sensing Check Point GND GND INPUT CT INPUT CT INPUT CT Inverter PCB CT Sensing Check Point 1 2 3 27 30 40k 48 56k Vdc Vdc GND ...

Page 94: ...e Filter 3 Defect of outdoor Main inverter PCB Display code Title Cause of error Check point Normal condition Error diagnosis and countermeasure flow chart Is transmission LED Yellow of inverter compressor PCB on Yes No Is noise filter or fuse normal Replace noise filter or fuse No Replace inverter compressor PCB Is transmission cable connected correctly Yes No Re connect transmission cable Is MAI...

Page 95: ...damage Display code Title Cause of error Check point Normal condition Error Diagnosis and Countermeasure Flow Chart Is EEPROM insertion normal No Yes Recheck power and installation condition 1 Check EEPROM insert direction connection condition 2 Check EEPROM Check SUM Replace if abnormality found Is inverter PCB assembly normal No Yes Replace inverter PCB assembly Yes MAIN PCB assembly normal No R...

Page 96: ...4 Trouble Shooting 95 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only MAIN PCB Inverter PCB EEPROM Direction Check Point 48 56k ...

Page 97: ...changer 3 Check distance between ODU and obstacles 4 Check pipe distortion and abnormality 5 Check service valve is opened Eliminate causes for abnormal condition Check resistance between NO 19 pin and NO 20 pin of PFC module Check resistance between NO 24 pin and NO 25 pin of PFC module 7KΩ 10 at 25 C Replace PCB if abnormality found Is assemble condition of INV PCB heatsink normal Is PCB tempera...

Page 98: ...ronics Inc All right reserved Only for training and service purposes LGE Internal Use Only PFCM Measuring resistance between No 19 20 pin IPM Measuring resistance between No 24 25 pin PFCM Measuring resistance between No 19 20 pin 27 30 40k 48 56k ...

Page 99: ...ity 5 Check service valve is opened Eliminate causes for abnormal condition Check resistance between NO 19 pin and NO 20 pin of PFC module Check resistance between NO 24 pin and NO 25 pin of PFC module 7KΩ 10 at 25 C Replace PCB if abnormality found Is assemble condition of INV PCB heatsink normal Is PCB temperature sensing part normal No No Yes Check assemble condition between INV PCB heatsink an...

Page 100: ...ronics Inc All right reserved Only for training and service purposes LGE Internal Use Only PFCM Measuring resistance between No 19 20 pin IPM Measuring resistance between No 24 25 pin PFCM Measuring resistance between No 19 20 pin 27 30 40k 48 56k ...

Page 101: ...tion condition Check ODU Fan Motor assemble condition and fan locking Reassemble or replace if abnormality found Is ODU Fan Motor normal No Yes 1 Set the multi tester to diode mode 2 Check voltage between 1pin and 4pin of Fan Motor 1 0 2V 3 Replace Inverter PCB if abnormality found Is wire connection of ODU Fan Motor wire normal No Yes Check wiring between OUD fan motor and Inverter PCB Check if H...

Page 102: ...opyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Tester Fan motor connector Check voltage betwen 1pin and 4pin of fan motor Inverter PCB Main PCB 48 56k 27 30 40k ...

Page 103: ...ndoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Is compressor Wire connection condition normal 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact Reasse...

Page 104: ...pyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Input Power Source Check Point Main PCB wiring Check Point N N L N L N L 27 30 40k Noise Filter wiring Check Point ...

Page 105: ...opyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Noise Filter wiring Check Point Input Power Source Check Point N L L N Inverter PCB wiring Check Point L N 48 56k ...

Page 106: ...wire of Live Neutral 3 Check the resistance between communication line and GND Normal Over 2MΩ 4 Check the connector for communication is correctly con nected 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 1 In Case...

Page 107: ...ble 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 Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Yes 1 Check inverter PCB assembly U V W connector connection condition 2 Check wir...

Page 108: ...cal shock 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 r...

Page 109: ...nnection between inverter PCB assembly and bridge diode misconnection disconnection wiring again if abnormality found Yes Is input voltage normal No Check R S S T T R phase voltage is 380V 10 R N S N T N phase voltage is 220V 10 Check connection condition and wiring if power is abnormal Yes Is inverter PCB assembly normal No Check inverter PCB assembly IPM normality Replace inverter PCB assembly A...

Page 110: ... and service purposes LGE Internal Use Only 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 Tester CT Sensor Output at the INVERTER PCB ...

Page 111: ...sis and Countermeasure Flow Chart Is DC Link voltage under 380V No Yes Yes Yes Recheck power and installation condition Yes Check the DC link Voltage AD Input of Inverter PCB If AD Input is strange change the Inverter PCB refer the next page Is Inverter PCB Normal No Check connection from terminal block to Inverter PCB assembly CN_L1 R CN_L2 S CN_L3 T Replace inverter PCB assembly Is input voltage...

Page 112: ...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 INVERTER PCB DC Link Voltage Check Point GND 500Vdc 10 DC Link DC Link Voltage INV oltage INV INPUT VOLTAGE Check Point GND GND DC Link Voltage INV GND Vdc Tester ...

Page 113: ...rror Check point Normal condition Tester INVERTER PCB INPUT VOL INPUT VOLTAGE INV AGE INV INPUT VOLTAGE Check Point GND GND INPUT VOLTAGE INV GND CH25 Check Point Error Diagnosis and Countermeasure Flow Chart Yes Recheck power and installation condition Yes Is Inverter PCB Normal No Replace inverter PCB assembly Is input voltage normal No R S S T T R phase voltage is 400V 10 R N S N T N phase volt...

Page 114: ...ition normal No Yes Yes Recheck power and installation condition 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...

Page 115: ...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 Service Valve open Check the outdoor fan Display code Title Cause of error Check point Normal condition Check Point 1 Check the install condition for over load 2 Check the Service Valve open 3 Check the outd...

Page 116: ...een PFC Micom and INV Micom 1 Micom defect Circuit defect 2 Different Micom S W Version 3 ODU inverter PCB assembly damage Display code Title Cause of error Check point Normal condition Error Diagnosis and Countermeasure Flow Chart Is Inverter PCB assembly normal No Replace inverter PCB assembly Is PFC Micom INV Micom S W Program normal No Upgrade Micom Program Yes Yes Recheck power and installati...

Page 117: ...or Check point Normal condition Tester CT Sensor Output at the INVERTER PCB INVERTER PCB INPUT INPUT VOL VOLTAGE INV AGE INV GND GND COMP COMP CURRENT CURRENT U V U V W W INPUT VOLTAGE Check Point INPUT VOLTAGE INV GND COMP CURRENT U V W Error Diagnosis and Countermeasure Flow Chart No Check the input voltage source Is nomal the offset of R N T N voltage Is CT Sensor Output is right No If the CT S...

Page 118: ...r Normal resistor 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resistor 10KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 5KΩ at 25 C Unplugged Normal voltage 2 5Vdc at 25 C plugged Normal resistor 200KΩ at 25 C Unplugged Normal voltage 4 5Vdc at 25 C plugged Normal resist...

Page 119: ... the indoor unit capacity Check the combination table Check the PCB ASM P No Check the poor soldering Display code Title Cause of error Check point Normal condition Check Point CH 51 1 Check the indoor unit capacity CH 60 1 Check the insertion condition of EEPROM 2 Check the poor soldering Model Gross Max Capacity Btu h Max Single Indoor Unit Capacity Btu h A7UW428FA3 54k A8UW488FA3 62k 24k A9UW54...

Page 120: ...L3 T CN L3 T CN L1 R CN L2 S CN L3 T R S R S T N G N G Fuse R S R S T N N R S T N R S R S T N N R S T N T N R S T R S T N G Error Diagnosis and Countermeasure Flow Chart No R S S T T R phase voltage is 380V æ 10 R N S N T N phase voltage is 220V æ10 Check connection condition and wiring if power is abnormal Is PCB connection Normal No 1 Check the Connection condition of PCBs 1 Input Output R S T N...

Page 121: ... sensor 10kΩ 10 at 25 C Check that outdoor fan is driving rightly Display code Title Cause of error Check point Normal condition Comp frequecy control accoding to heatsink temp ქኩ ZGy Ⴓ ქኩ Ⴓ ქኩ ཙ ხᄅ ጒ ხᄅ α Gy Cnvm α Gy Cnvm α Gy Cnvm NEE Snee 8 C S1 74 C S0 7 C Gd s Rhmj ပ Comp frequency control according to heat sink temp No Is normal heatsink sensor connecting No Connect the heatsink sensor righ...

Page 122: ...connector Check the fan control part of the INVERTER PCB Display code Title Cause of error Check point Normal condition Error Diagnosis and Countermeasure Flow Chart FAN Motor Connection check Replace inverter PCB assembly Is Fan motor nomal No Change abnomal motor Yes Is fan connector condition right No Do right fan connector condition Yes CH67 Outdoor fan lock occurrence INVERTER PCB connection ...

Page 123: ...P NO MFL36552501 APRIL 2008 ...

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