Window Air Conditioner SVC MANUAL(General)
Contents
1. NO e Check the PCB pattern UA Is the voltage No 20 of IC 1 DC 5V YES Exchange Main PCB Ass y 16 Window Air Conditioner Troubleshooting Guide Possible Trouble 2 The compressor does not operate Is setting Temp set lower than Room e Select the setting Temp to lower Number Temp 0 5 C Is the voltage No 10 Is the voltage NO 7 of Is the Unit for 3 minutes NO of IC7 OV IC 7 DC 5V delay YES YES YES e Check the RY COMP Exchange IC7 Waie3 Minutes e Check the wiring e Exchange MAIN PCB Ass y Diagram Possible Trouble 3 The compressor always operate Is the wire connection of RY COMP all right NO e Connect LEAD Wire to RY COMP again e Check the RY COMP Service Manual 17 Troubleshooting Guide Possible Trouble 4 FAN does not operate Is the voltage NO 2 or 3 NO of IC7 DC 5V Exchange IC1 Is the voltage NO 14 or 15 of IC7 OV YES s e Exchange IC7 e Check the RY High or RY Low e Check the wiring diagram Possible Trouble 5 Remote controller does not operate Is the voltage of Battery NO Exchange the battery about over 2 3V Exchange the battery Is the voltage No 7 NO of CN DISP2 on Main PCB e Check the PCB pattern Ass y DC 5V Is the connection of NO e Connect connector to CN DISP2 all right CN DISP2 exactly a e Exchange Receiver Ass y 18 Window A2. Test capacitor Replace if not within 10 of manufacturer s rating Replace if shorted open or damaged Will not rotate Fan blade hitting shroud or blower wheel hitting scroll Realign assembly Units using slinger ring for condenser fan must have 1 4 to 5 16 inch clearance to the base If it hits the base shim up the bottom of the fan motor with mounting screw s Check fan motor bearings if motor shaft will not rotate replace the motor Fan motor runs intermittently Revolves on overload Check voltage If not within limits call an electrician Test capacitor Check bearings Does the fan blade rotate freely If not replace fan motor Pay attention to any change from high speed to low speed If the speed does not change replace the motor Fan motor noise Fan If cracked out of balance or partially missing replace it Turbo If cracked out of balance or partially missing replace it Loose clamper Tighten it Worn bearings If knocking sounds continue when running or loose replace the motor If the motor hums or noise appears to be internal while running replace motor Compressor will not run but fan motor runs Voltage Check voltage If not within limits call an electrician Wiring Check the wire connections if loose repair or replace the terminal If wires are off refer to wiring diagram for identification and replace Check wire locations
3. DC 5V Main amp Display PCB Is the Knob of SW1 set to left position YES e Reference to OWNER S MANUAL 14 Window Air Conditioner Troubleshooting Guide Possible Trouble 6 Remote controller does not operate Is the voltage of Battery about over 2 3V NO e Exchange the battery Is the voltage No 10 of CN DISP2 on Main PCB Ass y DC 5V NO e Check the PCB pattem e Connect connector to Is the connection of CN DISP2 all right CN DISP2 exactly YES e Exchange Receiver Ass y Possible Trouble 7 It displays abnormally on display PCB Ass y Is the ICO1G all right NO Exchange ICO1G e Connect connector Is the connection of to CN DISP2 exactly CN DISP 2 all right Does the Q12G Q13G Q14G operate normally on main PCB Ass y e Exchange Q12G Q13G Q14G e Exchange the display PCB Ass Service Manual 15 Troubleshooting Guide LWC1264PBG PHG LWC1264VBS QBG Possible Trouble 1 The unit does not operate NO e Check the Fuse 13 oo e Check the wiring diagram e Check the Main Is shorted the Trans output PCB pattern YES e Exchange the Trans NO e Exchange BD1 e Exchange IC2 NO e Exchange IC3 Is the reset circuit all right NO e Exch IC4 C07 The No 16 of IC1 is 5V xchange Is the connection between Main and Display all right NO e Connect connector exactly
4. circuit all right The No 16 of Micom is 5V e Exchange ICO1A C02A pes Is the connection between Main and Display all right e Connect connector exactly Is the voltage No 20 of Micom e Check the PCB DC 5V pattem es Exchange Main PCB Ass y 12 Window Air Conditioner Troubleshooting Guide Possible Trouble 2 The compressor does not operate Is setting Temp set lower than Room Temp 0 5 C e Select the setting Temp to lower Number Is the voltage No 11 NO of ICO1M OV Is the voltage NO 6 of ICO1M DC 5V Is the Unit for 3 minutes delay e Check the RY COMP Exchange ICO1M e Check the wiring Diagram e Exchange MAIN PCB Assy Possible Trouble 3 The compressor always operate Is the wire connection of e Connect LEAD Wire to RY COMP all right RY COMP again e Check the RY COMP Service Manual 13 Troubleshooting Guide Possible Trouble 4 FAN does not operate Is the voltage NO 2 or 3 or 4 of ICO1M DC 5V i e Exchange ICO1M Is the voltage NO 13 or 14 or 15 of ICO1M OV e Exchange ICO1M e Check the RY Hi or RY Med or RY Lo e Check the wiring diagram Possible Trouble 5 The function of Energy Saver does not operate ed e Set the Knob of SW1 to left position Is the voltage No 1 of e Check the SW1 CN DISP 1 of Main PCB e Check the pattern of Ass y
5. 44 50 F 7 10 C Troubleshooting Guide Check of power source Check circuit breaker and fuse Check of control switch i Gas leakage of feeler bulb setting of thermostat Check of control switch Fan only fails to start Improper wiring Defect of fan motor capacitor Compressor only fails to start Drop of power voltage a Improper thermostat setting Defect of compressor capacitor Loose terminal connection Irregular motor resistance Q Irregular motor insulation Q Capacitor check Improper wiring Replacement lt Irregular motor resistance Q Replacement of fan motor Regular but fails to start Irregular motor insulation Q Replacement of compressor locking of rotor metal Replacement of compressor Motor damaged Service Manual 11 Troubleshooting Guide LWC1264PAG PAN PCG LWC1264QAG QAS LWC126CBHKO LWC126CGMM0 CBMM1 LWC096CB MKO Possible Trouble 1 The unit does not operate Is the Trans input power e Check the Fuse AC 220 240V e Check the wiring diagram ps e Check the Main PCB pattern NO Is the Trans output power about AC 13V Is shorted the Trans output ie YES e Exchange the Trans e Exchange D02D D05D tVol fICO1D s output Voltage of ICO e Exchange ICO1D DC 12V Is output Voltage of IC02D DC 5V e Exchange IC 02D Is the reset
6. D 7 AIR BIR GOO KZZZOA ROOM AIR HEAT LOAD p lt x AS Pod gt A a RRA El ES 94 E OUTSIDE COOLING a E AIR FOR REFRIGERANT 4 PASS THROUGH le gt LIQUID PRESSURE LIQUID OUTLET DROP TIA HIGH PRESSURE VAPOR CAPILLARY TUBE BB tiquip REFRIGERANT BOO e SS LOW PRESSURE VAPOR ese Figure 33 Service Manual 9 Troubleshooting Guide In general possible trouble is classified in two kinds The one is called Starting Failure which is caused from an electrical defect and the other is ineffective Air Conditioning caused by a defect in the refrigeration circuit and improper application Unit runs but poor cooling Check cold air circulation for smooth flow Dirty indoor coil Heat exchanger Malfunction of fan Clogged of air filter Obstruction at air outlet Correct above trouble Check clogging in refrigera tion circuit Repair clogging in refrigera tion circuit 10 Window Air Conditioner Ineffective Cooling Check outdoor coil heat exchanger amp the fan operation Check gas leakage Not on separate circuit Repair gas leak Check inside gas Replacement of unit if the pressure unit is beyond repair Check heat load increase Clean condenser Adjusting of refrigerant charged Malfunction of compressor Replacement of compressor Satisfactory operation with temperature difference of inlet amp outlet air
7. If not per wiring diagram correct Rotary Check for continuity refer to the wiring diagram for terminal identification Replace the switch if circuit is open 20 Window Air Conditioner Troubleshooting Guide COMPLAINT CAUSE REMEDY Compressor will not run Thermostat Check the position of knob If not at the coldest set but fan motor runs ting advance the knob to this setting and restart unit Check continuity of the thermostat R eplace thermo stat if circuit is open Thermistor Check the TEMP control If not at the lowest number set TEMP control to this setting and restart the unit Check the continuity of the thermistor Replace the thermistor if the circuit is open Capacitor Discharge capacitor before servicing Check the capacitor Replace if not within 10 of manufacturers rating Replace if shorted open or damaged Compressor Check the compressor for open circuit or ground If open or grounded replace the compressor Overload Check the compressor overload if externally mount ed Replace if open If the compressor temperature is high remove the overload cool it and retest Compressor cycles on Voltage Check the voltage overload If not within limits call an electrician Overload Check overload if externally mounted Replace if open If the compressor temperature is high remove the overload cool and retest Compressor cycles on Fan motor If not running de
8. al 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 OPP GO OBOBPPOP 8 OO 4 Window Air Conditioner Safety Precautions Do not tilt the unit when 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 connect or disconnect connector or parts damage may be occurred gt PO 1 2 Inspections after Repair AWARNING 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 or fire Do not use a joined power cable or extension cable or share 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 Do not block the inlet or outlet of air flow It may cause product failure ACAUTION 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 t
9. e temperature is selected by positioning the knob to the desired position The 5 or 6 position is a normal setting for average conditions OPERATION a 6 o Off 0 Turns the air conditioner off 3 MED FAN CB Permits the medium fan speed operation without 2 i f cooling Uv so Low Cool LOWFAN Permits the low fan speed operation without Thermostat Operation cooling Auto Swing Ey HIGH COOL 3K Permits cooling with the high fan speed oper Med High 5 on off 4 t 6 ation 3 7 ds 5 MED COOL 3K Permits cooling with the medium fan speed 2 8 Low Med 1 g operation Fan Cool Low Cool LOW COOL gt Permits cooling with the low fan speed opera Dem Operanon tion CAUTION A slight heat odor may come from the unit when first switching to HEAT after the cooling season is over This odor caused by fine dust particles on the heater will disap pear quickly 6 Window Air Conditioner 2 Heat Pump Model e HEATER LAMP When the unit sets heating operation condition the green lamp is lighted When the frost settles on the heat exchanger of the outside defrosting is made automatically and the green lamp is unlighted The until it may hiss and the fan motor will stop for 1 to 10 minutes This should not be regarded as trouble After defrosting the heating operation begins again THERMOSTAT Turn the thermostat control to the desired setting The cen
10. he installation platform or frame has corroded Corroded installation plat form or frame can cause the unit to fall resulting in injury Be sure to check the earth wire is correctly connected After the work has finished be sure to do an insulation tset to check the resis tance 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 Check the drainage of the indoor unit after the repair If drainage is faulty the water to enter the room and wet floor gt DOS 0009 Service Manual 5 Operation ll Operation Features e Designed for COOLING ONLY e Built in adjustable THERMOSTAT e Powerful and whispering cooling e Washable one touch filter e Slide in and slide out chassis for the simple instal Compact size lation and service e Reliable and efficient rotary compressor e Side air intake side cooled air discharge Ol 1 Cooling Only Model e VENTILATION The ventilation lever must be in the CLOSE position in order to maintain the best cooling conditions When a fresh air is necessary in the room set the ventilation lever OPEN position 7 The damper is opened and room air is exhausted CLOSE milla VENT alls OPEN THERMOSTAT Thermostat will automatically control the temperature of the room Select a higher number for a cooler tempera ture in the room Th
11. http biz lgservice com Window Air Conditioner MODEL Window CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel Air Conditioner Service Manual CONTENTS Safety Precautions A E la das Spgs secede decid teed ener 3 Operation a a td 6 O teas cut Sel ens ie aes oe ied 6 Control Locations Function of Controls ri 6 Tro blesh otNg Ie eo le e no 9 A II Mensch adden 9 TrOUDlE SNC NUI o o o ado Ate a alia 10 Electrical Parts Troubleshooting Guide cccccccssscceseesceseseeseseeaeeeeseeseeeeseesesesnerseseseataeeaseataes 12 Room Air Conditioner Voltage LING cia a a do as 20 2 Window Air Conditioner Safety Precautions Il Safety Precautions 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 SAFETY PRECAUTIONS 1 When servicing the unit set the main SWITCH to OFF and
12. ir Conditioner Troubleshooting Guide Possible Trouble 6 It displays abnormally on display PCB Ass y Is the IC6 all right e Exchange IC6 YES e Connect connector Is the connection of CN DISP 1 all right to CN DISP1 exactly YES Does the TR1 TR2 TR3 operate normally on main PCB Ass y ves e Exchange the display e Exchange TR1 TR2 TR3 PCB Assy Possible Trouble 7 The function of Auto Restart does not operate Is the Knob of SW1 NO e Set the Knob of SW1 set to left position to left position Is the voltage No 3 of e Check the SW1 CN DISP2 of Main PCB e Check the pattern of Ass y DC 5V Main amp Display PCB e Reference to OWNER S MANUAL Service Manual 19 Troubleshooting Guide NAME PLATE RATING MINIMUM MAXIMUM 220 240 10 198V 264V COMPLAINT CAUSE REMEDY Fan motor will not run No power Check voltage at outlet Correct if necessary Power supply cord Check voltage to rotary switch If none check power supply cord Replace cord if circuit is open Rotary switch Check switch continuity Refer to wiring diagram for terminal identification Replace switch if defective Wire disconnected or con nection loose Connect wire Refer to wiring diagram for terminal identification Repair or replace loose terminal Capacitor Discharge capacitor before testing
13. r is set by 1 hour Ww FAN SPEED SELECTOR Select the fan speed Cooling Model 3 steps High F3 gt Low F1 gt Med F2 gt High F3 Heating Model 2 steps High F2 gt Low F1 gt High F2 A 5 ROOM TEMPERATURE SETTING BUTTON Control the room temperature within a range of 16 C to 30 C The room temperature will be adjusted by 1 C 30min and by 2 C 1 hour later 5 SIGNAL RECEIVER AUTO SWING The vertical louver swings horizontally by the automatic system and stops when you press the button again N 8 Window Air Conditioner Troubleshooting Guide E Troubleshooting Guide CONDENSER CONDENSER COIL 1 COIL FAN CAPILLARY FAN CAPILLARY MOTOR TUBE MOTOR TUBE COMPRESSOR COMPRESSOR BLOWER BLOWER EVAPORATOR COIL EVAPORATOR COIL COOLING CYCLE gt HEATING CYCLE Figure 32 is a brief description of the important components and their function in what is called the refrigeration system This will help you to understand the refrigeration cycle and the flow of the refrigerant in the cooling cycle ROOM AIR CONITIONER CYCLE OF REFRIGERATION EVAPORATOR COILS CONDENSER COILS VAPOR INLET SUCTION LINE COMPLETE LIQUID COOL LOW PRESSURE VAPOR HoT BOIL OFF POINT DISCHARGE
14. remove the POWER SUPPLY cables 2 Observe the original lead dress If a short circuit is found replace all parts which have been overheated or damaged by the short circuit 3 After servicing the unit make an insulation resistance test to protect the cus tomer from being exposed to shock hazards INSULATION RESISTANCE TEST 1 Unplug the power cord and connect a jumper between 2 pins black and white 2 The grounding conductor green or green amp yellow is to be open A 3 Measure the resistance value with an ohm meter between the jumpered lead and each exposed metallic part on the equipment 4 The value should be over 1MQ 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 A main potential when the equipment 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 Service Manual 3 Safety Precautions 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 gas or refrigerating machine oil discharges and it Can cause injury When the refrigerant gas leaks during work execute ventilation If the ref
15. rigerant gas touches to a fire poisonous gas generates A case of leakage of the refriger ant and the closed room full with gas is dangerous because a shortage of oxy gen occurs Be sure to execute ventilation When removing the front panel or cabinet execute short circuit and discharge between high voltage capacitor terminals If discharge is not executed an elec tric shock is caused by high voltage resulted 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 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 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 Hoding the plug by hand when taking out Otherwise there is risk of electric shock or fire ACAUTION Do not turn on the breaker under condition that front panel and cabinet are removed Be sure to earth the air conditioner with an earthing conductor connected to the earthing termin
16. termine the cause Replace if overload required Condenser air flow restric tion Remove the cabinet inspect the interior surface of the condenser if restricted clean carefully with a vacuum Cleaner do not damage fins or brush Clean the interior base before reassembling Condenser fins damaged If condenser fins are closed over a large area on the coil surface head pressures will increase causing the compressor to overload Straighten the fins or replace the coil Compressor cycles on overload Capacitor Test capacitor Wiring Check the terminals If loose repair or replace Refrigerating system Check the system for a restriction Insufficient cooling or heat ing Air filter If restricted clean of replace Exhaust damper door Close if open Unit undersized Determine if the unit is properly sized for the area to be cooled Excessive noise Turbo or fan Check the set screw or clamp If loose or missing correct If the turbo or fan is hitting air guide rearrange the air handling parts Copper tubing Remove the cabinet carefully and rearrange tubing not to contact cabinet compressor shroud and bar rier Service Manual 21 P NO MFL37825901 JANUARY 2007
17. tral position is a normal setting for average conditions You can change this setting if neces sary in accordance with your temperature prefer ence The thermostat automatically controls cooling or heating but the fan runs continuously whenever the air conditioner is in operation If the room is too warm turn the thermostat control clockwise If the room is too cool turn the themostat control counterclockwise OPERATION OFF Turns the air conditioner off LOW FAN e Permits the low fan speed opera tion without cooling or heating LOW COOL x Permits cooling with the low fan speed operation HIGH COOL 3 Permits cooling with the high fan speed operation LOW HEAT x Permits heating with the low fan speed operation HIGH HEAT xt Permits heating with the high fan speed operation Operation P A COOLER WARMER 9 9 Oe j HEATER se M THERMOSTAT OPERATION OF sl Warmer Cooler as Thermostat Operation TYPE2 Service Manual 7 Operation 3 Cooling and Heating Model with Remote Control and Touch Type DISPLAY REMOTE CONTROL POWER BUTTON Operation starts when this button is pressed and stops when you press the button again Nx OPERATION MODE SELECTION BUTTON Select Cooling Heating or Fan mode with this button IN ON OFF TIMER BUTTON Set the time of starting and stopping operation The time
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