LG LS301CE Service Manual Download Page 50

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50 Room Air Conditioner

Troubleshooting Guide

Troubleshooting Guide

Refrigeration Cycle Diagram

INDOOR UNIT

OUTDOOR UNIT

INDOOR UNIT

OUTDOOR UNIT

HEAT
EXCHANGER
(EVAPORATOR)

HEAT
EXCHANGER
(CONDENSER)

COMPRESSOR

ACCUMU
LATOR

Suction Line

3-WAY VALVE

Evaporator Line

3-WAY VALVE

CAPILLARY TUBE

CHECK VALVE

(Heating Model only)

COOLING

HEATING

REVERSING
VALVE
(Heating Model Only)

(1) Cooling Only Models

(2) Cooling & Heating Models

Summary of Contents for LS301CE

Page 1: ...oom Air Conditioner SERVICE MANUAL LG MODELS LS301HE LS301CE CAUTION website http www lgservice com BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL ONLY FOR AUTHORIZED SERVICE PERSONNEL ...

Page 2: ...oor unit 22 Checking the drainage and forming the pipings 23 Checking the drainage 23 Form the piping 24 AIR PURGING 25 Air purging 25 Test Running 27 Operation 28 Operation 28 Functions 28 The function of main control 30 Display Function 36 Self diagnosis Function 36 Name and Function Remote Control Cooling Models 37 Name and Function Remote Control Heat Pump Models 38 Disassembly 39 Indoor Unit ...

Page 3: ...symbol indicates the possibility of death or serious injury This symbol indicates the possibility of injury or damage to properties only Be sure not to do Be sure to follow the instruction Do not use damaged power cords plugs or a loose socket Always use the power plug and socket with the ground terminal There is risk of fire of electric shock There is risk of electric shock Install the panel and ...

Page 4: ... cause injury Be especially care ful of the case edges and the fins on the condenser and evaporator There is risk of fire electric shock explosion or injury Be cautious when unpacking and installing the product For installation always contact the dealer or an Authorized service center For re installation of the installed product always contact a dealer or an authorized ser vice center Do not insta...

Page 5: ...the plug to remove the cord from the outlet Do not touch it with wet hands Do not place a heater or other appliances near the power cable There is risk of fire or electrical shock There is risk of fire and electric shock Do not allow water to run into electrical parts Do not store or use flammable gas or com bustibles near the air conditioner There is risk of fire failure of the product or electri...

Page 6: ...ion may cause water leakage Keep level even when installing the product Use two or more people to lift and transport the air conditioner To avoid vibration or water leakage Avoid personal injury Installation 90 Unplug the unit if strange sounds odors or smoke comes from it Be cautious that water could not enter the product There is risk of electric shock or fire There is risk of fire electric shoc...

Page 7: ... shock or damage to the plastic parts of the product There is risk of personal injury Do not step on or put anyting on the product outdoor units Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in There is risk of personal injury and failure of product There are sharp and moving parts that could cause personal injury Operation Wax Safety Pre...

Page 8: ...e D Indoor Unit This symbol alerts you to the risk of electric shock This symbol alerts you to hazards that could cause harm to the air conditioner This symbol indicates special notes NOTICE Symbols Used in this Manual W mm inch 1 259 49 6 H mm inch 349 13 7 D mm inch 205 8 1 Model Dimension 30k SERIES ...

Page 9: ...iquid side 3 way valve W mm in ch 870 34 3 H mm in ch 800 31 5 D mm in ch 320 12 6 L1 mm in ch 370 14 6 L2 mm in ch 340 13 4 L3 mm in ch 25 1 0 L4 mm in ch 775 30 5 L5 mm in ch 25 1 0 L6 mm in ch 546 21 5 L7 mm in ch 162 6 4 L8 mm in ch 162 6 4 L9 mm in ch 54 2 1 L10 mm in ch 74 5 2 9 L11 mm in ch 79 3 1 30k SERIES ...

Page 10: ...ight Manual Remocon Type Wireless LCD Setting Temperature Range Cooling Mode 64 86 F Temperature Increment 2 F Auto Operation electronic control Yes Self Diagnosis Yes Timer 24hr On Of Sleep Operation Yes Healthy Dehumidification Mode Yes Restart Delay minutes 3 Refrigerant R 22 Charge g oz 2550 89 9 Power cord AWG P mm2 12 3 2 5 Fuse or breaker Capacity A 30A Connecting Cable AWG P mm2 16 4 0 75 ...

Page 11: ...tion Control left right Manual Remocon Type Wireless LCD Setting Temperature Range Cooling Mode 64 86 F Heating Mode 60 86 F Temperature Increment 2 F Auto Operation electronic control Yes Self Diagnosis Yes Timer 24hr On Off Sleep Operation Yes Healthy Dehumidification Mode Yes Restart Delay minutes 3 Defrost Control Yes Hot Start Yes Refrigerant R 22 Charge g oz 2550 89 9 Power cord AWG P mm2 12...

Page 12: ... a place where noise and vibration are minimum Select a place so that the warm air and noise from the air con ditioner do not disturb neighbors Rooftop Installations If the outdoor unit is installed on a roof structure be sure to level the unit Ensure the roof structure and anchoring method are adequate for the unit location Consult local codes regarding rooftop mounting If the outdoor unit is ins...

Page 13: ...and mark the centerline It is also important to use caution concerning the location of the installation plate routing of the wiring to power outlets is through the walls typically Drilling the hole through the wall for piping con nections must be done safely 5 7mm 0 2 0 3 Indoor WALL Outdoor Installation Plate Type A screw 1 D4 0 L38 0 MSR3 FZW 30K Right rear piping Left rear piping 50mm 2 0 ø70mm...

Page 14: ...dropping burrs into the tubing 3 Putting nut on Remove flare nuts attached to indoor and outdoor unit then put them on pipe tube having complet ed burr removal not possible to put them on after flaring work Copper pipe 90 Slanted Uneven Rough Bar Copper pipe Clamp handle Red arrow mark Cone Yoke Handle Bar A Pipe Reamer Point down 4 Flaring work Carry out flaring work using flaring tool as shown b...

Page 15: ...scratch the wall and mat to drop 1 Route the indoor tubing and the drain hose in the direction of rear left 2 Insert the connecting cable into the indoor unit from the outdoor unit through the piping hole Do not connect the cable to the indoor unit Make a small loop with the cable for easy connection later Right side panel Drain hose Main PCB Lower panel Lower panel For left rear piping CAUTION Wh...

Page 16: ... upper portion of the installation plate Engage the three hooks of the rear top and rear lower of the indoor unit with the upper edge and lower edge of the installation plate Ensure that the hooks are properly seated on the installation plate by moving it left and right 5 Connecting the pipings to the indoor unit and drain hose to drain pipe Align the center of the pipings and sufficiently tighten...

Page 17: ...o the rear piping housing sec tion 1 Route the indoor tubing and the drain hose to the required piping hole position 2 Insert the piping drain hose and the connecting cable into the piping hole 3 Insert the connecting cable into the indoor unit Don t connect the cable to the indoor unit Make a small loop with the cable for easy connection later 4 Tape the drain hose and the connecting cable Connec...

Page 18: ...door unit install the drain pipe 7 Wrap the insulation material around the connecting portion Overlap the connection pipe heat insulation and the indoor unit pipe heat insulation material Bind them together with vinyl tape so that there is no gap Wrap the area which accommodates the rear piping housing section with vinyl tape Installation plate Three upper hooks Installation plate Indoor unit Thre...

Page 19: ... section 8 Reroute the pipings and the drain hose across the back of the chassis 9 Reinstall the parts to the original position Refix the lower panel to the original position Connect display conductor Refix the front right side panel to the original position with the two screws Drain hose Vinyl tape narrow Pipe Wrap with vinyl tape wide Lower panel Main PCB Piping for passage through piping hole ...

Page 20: ...s Be sure the rubber the cap is securely fastened so that there is no leakage 1 Align the center of the pipings and sufficiently tighten the flare nut by hand 2 Finally tighten the flare nut with torque wrench until the wrench clicks When tightening the flare nut with torque wrench ensure the direction for tightening follows the arrow on the wrench 1 2 3 4 Outdoor unit Gas side piping Bigger diame...

Page 21: ...4 5 L1 6 L2 1 2 3 Terminals on the outdoor unit POWER INPUT RED BLUE BLACK BLACK BROWN RED Ø 8 5mm 0 33in 20mm 0 79in GN YL AWG 12 20mm 0 79in AWG 20 The power supply cord connected to the outdoor unit should be complied with the following specifications UL and CSA recognized one The connecting cable connected to the indoor and outdoor unit should be complied with the following specifications UL a...

Page 22: ... casing of electrical fittings are liable to come loose from vibrations to which the unit is subjected during the course of transportation Check them and make sure that they are all tightly fastened If they are loose it could cause burn out of the wires 3 Specification of power source 4 Confirm that electrical capacity is sufficient 5 See to that the starting voltage is maintained at more than 90 ...

Page 23: ... drainage Pour a glass of water on the drain pan Ensure the water flows through the drain hose of the indoor unit without any leakage and goes out the drain exit 5 Drain piping The drain hose should point downward for easy drain flow Do not make drain piping Right side panel Downward slope Do not raise Accumulated drain water Tip of drain hose dipped in water Air Waving Water leakage Water leakage...

Page 24: ...se and connecting cable from down to up Secure the tapped piping along the exterior wall using saddle or equivalent 3 In cases where the Outdoor unit is installed above the Indoor unit perform the following Tape the piping and connecting cable from down to up Secure the taped piping along the exterior wall Form a trap to prevent water entering the room Fix the piping onto the wall by saddle or equ...

Page 25: ...nd the gas side service valves on the outdoor unit are kept closed at this stage 2 Leak test Connect the manifold valve with pressure gauges and dry nitrogen gas cylinder to this service port with charge hoses Pressurize the system to no more than 150 P S I G with dry nitrogen gas and close the cylinder valve when the gauge reading reached 150 P S I G Next test for leaks with liquid soap Do a leak...

Page 26: ...nut securely with an adjustable wrench This process is very important to prevent leakage from the system Replace the valve caps at both gas and liquid side service valves and fasten them tight This completes air purging with a vacuum pump The air conditioner is now ready to test run 1 Remove the caps from the gas side and liquid side valves 2 Remove the service port cap from the gas side valve 3 T...

Page 27: ... 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 NOTICE Bolt Tubing connection Outside ambient TEMP The pressure of the gas side service valve 95 F 35 C 4 5kg cm2 G 56 8 71 0 P S I G This is performed when the unit is to be relocated or the refrigerant circuit...

Page 28: ...ited for approx 3 minutes High Med Low and Auto Intermittent operation of fan at low speed Both the indoor and outdoor fan stops during defrosting Hot start will be operated after defrosting ends The indoor fan stops until the indoor pipe temperature will be reached at 82 F 28 C The fan is switched to low Cooling med Heating speed The unit will be stopped after 1 2 3 4 5 6 7 hours The fan is switc...

Page 29: ...el only TEMPERATURE LOW HIGH Cooling Operation Mode Heating Operation Mode Auto Operation Mode Fan Operation Mode Horizontal Airflow Direction Control Button Option Room Temperature Display Setting the Time or Timer ON OFF SET Selecting C F C F CANCEL Fan Speed Selection Low Med High CHAOS High 98 F 39 C Low 54 F 12 C OFF ON OFF ON Fan Operates without cooling or heating Cooling Down to 64 F 18 C ...

Page 30: ...low CLOSED OPEN Cooling Mode 8 CLOSED OPEN Heating Mode 8 1 Time delay Safety Control 3min The compressor operation is delayed for 3 minutes to balance the pressure of cycle Protection of compressor 5sec The indoor fan is delayed for 5 seconds when operating initially to prevent noises occurred by the vertical louver and wind 2min The reversing valve is delayed for 2 minutes to prevent the refrige...

Page 31: ...KE AIR TEMP SETTING TEMP 1 F Compressor OFF SETTING TEMP 1 F Compressor ON COMPRESSOR ON OFF ON OFF INDOOR FAN SPEED The electronic control operation Intake air Temperature Setting Temperature Over 78 F 77 F Over 76 F below 78 F Intake air 1 C Over 72 F below 76 F Intake air 0 5 C Over 68 F below 72 F Intake air temperature below 64 F 64 F Over 64 F below 86 F Electronic control below 64 F 64 F ov...

Page 32: ... down automatically If you want to stop auto swing press chaos swing button again 5 Healthy Dehumidification 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 79 F Intake Air Temp 77 F 75 F Intake Intake Air Temp 79 F Intake Air Temp 2 F 64 F Intake Int...

Page 33: ... indoor pipe temperature is higher than 95 F indoor fan operates at low speed When the indoor pipe temperature becomes lower than 95 F indoor fan stops B point When the indoor pipe temperature is higher than 100 F 38 C fan operates at selected fan speed INDOOR FAN SPEED Low OFF Low Low OFF OFF OFF LOW ON Selecting fan speed INDOOR PIPE TEMP 82 F 78 F 1min INDOOR FAN SPEED COMPRESSOR Hot Start Cont...

Page 34: ...3 4 5 6 7 hours Heating Mode with the Sleep Mode only Heating Model The operation will be stopped after 1 2 3 4 5 6 7 hours INTAKE AIR TEMP SETTING TEMP 1 F Compressor ON SETTING TEMP 1 F Compressor OFF 30 minutes 30 minutes More than 3 minutes 2 F 2 F More than 3 minutes COMPRESSOR ON OFF ON OFF ON INDOOR FAN SPEED Low Low Low Low Low SETTING TEMP 6 F Compressor OFF SETTING TEMP Compressor ON COM...

Page 35: ...ation is the function to operate procedures automatically to the pre vious operating conditions If you want to use this operation The autorestart button is on the main unit of the appliance in the standard condition press the auto restart button to make this function active If you do not want to use this operation free the auto restart button once again If you do not want to use this operation mov...

Page 36: ... model only Auto Restart Mode Lights up during if Restart Button is pressed Auto Restart Button In failure of electric power if the button is pressed the unit runs as previous setting operation when power returns Forced Operation Button Operation starts when this button is pressed and stops when you press the button again 3sec 3sec 3sec once 3sec 3sec twice 3sec 5times Error Code 1 2 5 Error LED I...

Page 37: ... the timer when the desired time is obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation AIR CIRCULATION BUTTON Used to circulate the room air without cooling or heating turns indoor fan on off ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature C F SELECTING BUTTON Choose temperature unit C or F alternatively HORIZONTAL AIRFLOW DI...

Page 38: ...imer when the desired time is obtained and to cancel the Timer operation SLEEP MODE AUTO BUTTON Used to set Sleep Mode Auto operation AIR CIRCULATION BUTTON Used to circulate the room air without cooling or heating turns indoor fan on off ROOM TEMPERATURE CHECKING BUTTON Used to check the room temperature C F SELECTING BUTTON Choose temperature unit C or F alternatively HORIZONTAL AIRFLOW DIRECTIO...

Page 39: ...ve the 2 screws of right side panel Remove the front right side panel by the arrow The connector can be disconnected by pulling it while pressing the connector s hook Remove the 1 screw for fixing low panel Remove the lower panel by the arrow Take care not to scratch the wall and mat to drop Remove the left side pane Remove the 2 screws Main PCB Low panel Lower panel Right side panel Left side pan...

Page 40: ...To remove the Grille pull the lower left and right side of the grille toward you slightly tilted and lift it straight upward 2 To remove the sensor housing connector earth conductor and step motor conductor with sensor holder Motor Evaporator and P C B Power Conductor Step Motor Conductor Motor Conductor Sensor Conductor Earth Conductor 30k 32k ...

Page 41: ...harge grille downward slightly unhook the discharge grille Pull the discharge grille out from the chassis carefully 5 To remove the Evaporator Remove 3 screws securing the evaporator at the left 2EA at the right 1EA Remove 2 screws securing the evaporator clamp Unhook the tab on the right inside of the chassis at the same time slightly pull the evaporator toward you until the tab is clear of the s...

Page 42: ...do not remove Loosen the screw securing the mount motor Separate the fan motor from the cross flow fan Take care not to drop the motor 7 To remove the Cross Flow Fan Loosen the screw securing the holder bearing Lift up the cross flow fan Screw Fan motor Screw Screw Fan motor Mount motor Holder bearing Disassembly ...

Page 43: ...YL OR CN DISP Receiver 9 9 7 8 7 8 10 10 1 1 3 2 3 2 PK BL CN U D 4 4 5 5 KID65004AF IC01G HVB CON 12V 13 16 14 15 R01G R05G 220 9 9 10 11 12 4 3 2 1 8 8 5 6 7 14 15 16 13 KID65004AF IC01M 4 1 2 3 16 10 11 13 12 14 15 9 7 8 Z B 6 4 5 1 3 2 INT1 PK LEFT RIGHT BL 5 5 STEPPING MOTOR OR YL 4 3 4 3 RD 2 1 1 2 C81 RXE250 POLY SW R90C 1K R96C R95C 10K IC10 7812 C04 50V 104 25V 470uF C03 O I TXD OUT DC 5V...

Page 44: ...D2 TEST D4 D6 D7 D5 D3 22 TEST 23 P60 AIN0 DC 5V 25V 0 01 C03H R09H 1K 1 P11 INT1 30 31 29 32 P10 INT0 P67 AIN7 P66 AIN6 33 25 24 P61 AIN1 28 26 27 P64 AIN4 P63 AIN3 P62 AIN2 P65 AIN5 TMP87CH46 P77 P75 P71 P70 P07 8 9 7 P74 P73 P72 6 5 4 3 P76 2 D1 1 MICOM 10k 10K 10K 25V Heat 4way PWM VDD P21 P15 P13 P14 35 34 36 RXD TXD P20 P17 P16 37 38 39 40 P22 41 42 R05H 08H TEST KEY 10Kx6 C09D 0 01 DC 5V R0...

Page 45: ... C06D JP25 C01L JP02 C93C OSC01B C02A JP04 C13M IC01A C01A JP06 JP05 OR2H OR6H OR5H OR4H OR3H OR1H C12M C11M JP07 JP08 JP21 C10M JP24 JP23 JP22 OJ4H OJ1H C02H OJ3H OJ2H CN_MOTOR POLY_SW C07C CN_HVB 1 1 R99C C92C BZ01E JP26 JP09 CN_TH1 1 CN_TH2 1 CN_CON 1 CN_12V CN_U D 1 JP13 JP11 JP12 JP14 1 C07F ASM 6871A20558 PWB 6870A90224A C03H CN_COMM JP20 JP19 JP18 C02N JP17 1 CN_DISP CN_L R2 JP15 CN_L R1 JP...

Page 46: ...3M C90 15V J20 C 0 6 M T R A N S 2 1 3 C07M 5 6 R 0 7 M 13 12 C 0 4 M 9 8 7 L02M L01M C 0 9 M J 0 4 R 0 9 M Q 0 2 M R 0 8 M C 0 2 M L02D C04D Vm R 0 4 M I C 0 3 M C 0 5 M D01M J 0 6 C 8 9 J 0 7 R 0 1 M L04M L03M R Y _ C O M P B LED91 Q 0 1 M R05H C 9 1 R 9 0 D92 R03M J 0 3 COM GND 35 30 C92 10 J 0 2 5 R 0 4 L R 0 6 L R 0 5 L R 0 1 K 15 T E S T _ K E Y IC10 J 0 8 R 0 5 M 25 R02M 22 C 0 1 M R95 IC9 ...

Page 47: ...Service Manual 47 Schematic Diagram DISPLAY P W B ASM Model LS301CE LS301HE ...

Page 48: ...48 Room Air Conditioner Wiring Diagram Schematic Diagram 1 Indoor Unit Cooling Only Models Heating Models ...

Page 49: ...Service Manual 49 Schematic Diagram 2 Outdoor Unit Cooling Only Models Heating Models ...

Page 50: ...EVAPORATOR HEAT EXCHANGER EVAPORATOR HEAT EXCHANGER CONDENSER HEAT EXCHANGER CONDENSER COMPRESSOR COMPRESSOR ACCUMU LATOR Suction Line Suction Line 3 WAY VALVE Evaporator Line Evaporator Line 3 WAY VALVE CAPILLARY TUBE CAPILLARY TUBE CHECK VALVE Heating Model only COOLING HEATING REVERSING VALVE Heating Model Only 1 Cooling Only Models 2 Cooling Heating Models ...

Page 51: ...is of reliability Oil trap should be installed per 5 7 meters 16 4 23 0ft Outdoor unit Indoor unit A B A Oil trap Outdoor unit Indoor unit B In case more than 5m 16 4ft 30k 5 8 3 8 7 5 25 15 50 30 100 30 0 32 50Hz 60Hz Pipe Size Capacity Btu h GAS LIQUID Additional Refrigerant g m oz ft Max Length A m ft Max Elevation B m ft Standard Length m ft ...

Page 52: ...rging of the charge hose Open the low pressure valve on the charge set slightly to air purge from the charge hose 5 Set the liquid side valve to the closed position 6 Operate the air conditioner in cooling mode and stop it when the gauge indicates 1kg cm2 g 7 Immediately set the Gas side valve to the closed position Do this quickly so that the gauge ends up indi cating 3 to 5kg cm2 g 8 Disconnect ...

Page 53: ... to tighten the flare nut on liquid side valve 4 Check for gas leakage Check the flare connections for gas leakage 5 Discharge the refrigerant Close the valve on the gas cylinder and dis charge the refrigerant until the gauge indicates 3 to 5 kg cm2 g 6 Disconnect the charge set and the gas cylin der and set the Liquid side and Gas side valves to the open position Be sure to use a hexagonal wrench...

Page 54: ... the charge set and discharge the refrigerant until the gauge indi cates 0 kg cm2 G If there is no air in the refrigerant cycle the pressure when the air conditioner is not running is higher than 1 kg cm2 G discharge the refrig erant until the gauge indicates 0 5 to 1 kg cm2 G if this is the case it will not be neces sary to apply a evacuatin Discharge the refrigerant gradually if it is dis charge...

Page 55: ...rd 76 cmHg vacuum of 4 mmHg or less 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 Liq...

Page 56: ...e at a time approximately 150g each time while operating the air conditioner in the cooling cycle however one time is not suffi cient wait approximately 1 minute and then repeat the procedure pumping down pin 4 Immediately disconnect the charge hose from the 3 way valve s service port Stopping partway will allow the gas to be dis charged If the system has been charged with liquid refrigerant while...

Page 57: ...r 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 1 The suction pressure is usually 4 5 6 0 kg cm2 G Cooling at normal condition 2 The temperature can be measured by attaching the thermometer to the lo...

Page 58: ...CN POWER Connector related to CN FAN Connector contacting of Outdoor Fan Compressor Display PWB Ass y Check Connector related to CN DC DC Check each load Indoor Outdoor Fan Motor Compressor Stepping Motor and contacting condition of related connector including connecting cable of Indoor Outdoor Unit PCB Board Operation Check Items Power Transformer Outdoor unit Input Voltage Output Voltage IC10 78...

Page 59: ...hen 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 by force Check DISP PWB Ass y Voltage between CN DISP DC 5V When the detect switch double key inside the remote controller door is fault it is impossible to operate temperature regulating and...

Page 60: ...ated circuit of R02H 12 1K R04H 6 2K Micom No 27 Indoor unit Check the indoor temperature sensor is disconnected or not About 10kΩ at 77 F When the temperature around Outdoor PWB Ass y is above 163 F the compressor is stop and only Outdoor Fan is operating Turn off Main Power Check the electrical wiring diagram of outdoor side Check the abnormal condition for the component of Compressor Outdoor Fa...

Page 61: ...ns of outdoor unit PWB Assy s Check the connecting condi tion and disconnection of connecting wires between Indoor and Outdoor unit Check the pattern and the condition of Indoor unit PWB Ass y Check the interference of Indoor Fan Does the voltage of each terminals of CN MOTOR CONNECTOR in Indoor unit corresponds to values in the Table of page 53 Check the motor of Indoor Fan Indoor Fan may be stop...

Page 62: ...oldering condition on PWB of CN UP DOWN Connector Check the operating circuit of the Vertical Louver Confirm that there is DC 12V between pin RED of CN UP DOWN and GND Confirm that there is a soldering short at following terminals Between 60 61 62 and 63 of MICOM Between 3 4 5 and 6 of IC01M Between 11 12 13 and 14 of IC01M Between 1 2 3 4 and 5 of CN UP DOWN If there are no problems after above c...

Page 63: ...ting with the remote controller then taking above 2 minutes Apply the power again after about 10 seconds by the power of Outdoor unit is off Check for the communication error and the operating condition of product after also operating with the remote controller then taking above 2 minutes Check the PWB assembly of Indoor and Outdoor unit Caution If the connecting wires of Indoor and Outdoor unit a...

Page 64: ...erate with a remote controller The operation indicator blinks once on for 0 5 second off for 3 seconds The compressor operates continuously regardless of the setting temperature and the variation of room temperature The operation indicator blinks once on for 0 5 second off for 3 seconds Continuous operation The operation indicator blinks once The compressor and the outdoor fan stop The indoor fan ...

Page 65: ...ted The fuse and Q61 in the Outdoor unit are damaged when the indoor fan is operated No power for Indoor unit The signal input of the remote controller and opera tion of product is impossible The RED indicator of the Outdoor unit blinks 5 times after 2 minutes with applying the power All functions stop The operation with the remote controller forced and test one do not operate The only signal of r...

Page 66: ...AB N CN MOTOR CN DC DC RY COMP A 3 4 RY COMP B BL BK BR RD 4 3 2 1 CN DC DC BL BK BR RD S Hi Hi Med Low Off 1 2 34 3 28 6 27 3 24 5 0 3 2 5 0 5 0 5 0 5 0 5 0 4 2 0 5 0 5 0 5 0 5 5 0 1 2 0 12 0 12 0 12 0 12 0 12 3 2 15 15 15 15 15 4 2 34 3 28 8 27 3 24 5 0 1 2 0 12 0 12 0 12 0 12 0 12 3 2 15 15 15 15 15 4 2 34 7 33 29 1 24 8 0 30K OUTDOO R CN DC DC INDOOR CN DC DC INDOOR CN MOTOR No of pins MODELS ...

Page 67: ... Exploded View 268711 1 135315 152313 267110 354210 35211B 146811 152302 359011 1 135311 342801 268711 3 567480 249951 359011 2 342800 352390 2 346810 733010 135313 135314 135316 352390 1 131410 147581 352150 Option Part Indoor Unit ...

Page 68: ...iew 447910 649950 435512 554031 137213 1 137213 2 559010 435301 430410 546810 349600 437210 435511 552111 567480 1 268711 3 W0CZZ 2 W0CZZ 1 552203 1 552203 2 554160 1 554160 2 550140 1 550140 2 Part for H P Models 2 Outdoor Unit 567502 ...

Page 69: ... 5231A20032F 159901 VANE HORIZONTAL 5990A20003A 5990A20003A 249951 CONTROL BOX ASSEMBLY INDOOR 4995A10115F 4995A10115E 263230 THERMISTOR ASSEMBLY 6323A20002C 6323A20002C 267110 REMOTE CONTROLLER ASSEMBLY 6711A20039M 6711A20039N 268712 PWB PCB ASSY DISPLAY 6871A20108A 6871A20108A 268714 PWB PCB ASSEMBLY MAIN 6871A20588B 6871A20588A 342800 BEARING 4280A20003A 4280A20003A 342801 BEARING 4280A20001A 4...

Page 70: ... ISOLATOR COMP 4H00982E 4H00982E 552111 TUBE ASSEMBLY CAPILLARY 5211A20034X 5211A20034X 552116 TUBE ASSEMBLY REVERSING 5211A20057B 552201 VALVE CHECK 3A01020H 3A01020H 552202 VALVE REVERSING 3A02027J 552203 1 VALVE SERVICE 2A00393H 2A00393H 552203 2 VALVE SERVICE 2A00392N 2A00392N 554031 CONDENSER ASSEMBLY BENT 6140AP2096A 6140AP2096Q 554160 1 COMPRESSOR SET 2520UHAK2AA 2520UHAK2AA 554160 2 COMPRE...

Page 71: ...P No 3828A20390S October 2006 Printed in Korea ...

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LG LS301CE, Service Manual

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