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Copyright ©2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

4.3 TROUBLESHOOTING GUIDE

In general, possible trouble is classified in two causes.
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

Ineffective Cooling

Check of outdoor coil
(heat exchanger) & the fan
operation.

Check gas leakage.

Repair gas leak.

Replacement of unit if the
unit is beyond repair.

Satisfactory operation with
temperature difference of
inlet & outlet air ; 44.6~50

°

F

Check heat load increase.

Unexpected residue

Overloaded Circuit

Check of inside gas
pressure.

Adjusting of refrigerant
charge

Malfunction of compressor

Replacement of
compressor

Check of 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

Stop of auto air-swing

Check clogging in
refrigeration circuit.

Repair clogging in
refrigeration circuit.

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Содержание WG1800R

Страница 1: ...ety precautions in General SVC manual Only for authorized service personnel Internal Use Only http biz lgservice com MODEL LWM1836TAS LWM1836QCG LWN2131QAG Y5USC24 6R WG2400R LWN2432QAS LWN2433TCS WG1800R M1804R Y5USC18 6R LWM1836QAS HBLG1800R HBLG2400R M2403R LWC243NSMM0 LWC243NSMM2 HBLG2350E ...

Страница 2: ...PRESSOR 7 2 3 3 CAPACITOR 7 2 3 4 POWER CORD 8 2 3 5 THERMISTOR 8 2 3 6 SYNCHRONOUS MOTOR 8 2 4 REFRIGERATION CYCLE 9 2 4 1 CONDENSER 9 2 4 2 EVAPORATOR 9 2 4 3 CAPILLARY TUBE 9 3 INSTALLATION 3 1 HOW TO INSTALL THE UNIT 12 3 2 HOW TO USE THE REVERSIBLE INLET GRILLE 12 3 3 WINDOW REQUIREMENTS 13 3 4 INSTALLATION KITS CONTENTS 13 3 5 SUGGESTED TOOL REQUIREMENTS 14 3 6 CABINET INSTALLATION 15 4 TROU...

Страница 3: ... LWM1863QAS Y5USC18 6R LWN2131QAG WG2400R HBLG2400R M2403R LWN2432QAS Y5USC24 6R LWC243NSMM0 LWN2433TCS LWC243NSMM2 HBLG2350E POWER SUPPLY COOLING CAPACITY Btu h INPUT W RUNNING CURRENT A REFRIGERANT CHARGE g OPERATING INDOOR C TEMPERATURE OUTDOOR C FAN INDOOR FAN OUTDOOR FAN SPEEDS FAN COOLING FAN MOTOR OPERATION CONTROL ROOM TEMP CONTROL AIR DIRECTION CONTROL CONSTRUCTION PROTECTOR COMPRESSOR FA...

Страница 4: ... when this button is pressed and stops when you press the button again OPERATION MODE SELECTION BUTTON Select Cooling or Fan or Dehumidification Dry mode with button Dry mode is not to all models ON OFF TIMER BUTTON Set the time of starting and stopping operation The timer is set by 1 hour FAN SPEED SELECTOR Select the fan speed in three steps High F3 Low F1 Med F2 High F3 ROOM TEMPERATURE SETTING...

Страница 5: ...ich fasten the cabinet at back See Fig 2 3 Pull the base pan forward 2 1 3 CONTROL BOX 1 Remove the front grille Refer to section 2 1 1 2 Pull the base pan forward so that you can remove the 2 screws which fasten the cover control at the right side See Fig 3 3 Remove the 3 screws which fasten the control box See Fig 3 4 Discharge the capacitor by placing a 20 000 ohm resistor across the capacitor ...

Страница 6: ...de and the top side See Fig 4 3 Move the evaporator sideward carefully 4 Remove the orifice from the air guide carefully 5 Remove the clamp spring which is clamped to the boss of blower by hand plier See Fig 5 6 Pull the blower outward without touching blades See Fig 6 7 Re install the components by referring to the removal procedure above 2 2 3 FAN 1 Remove the cabinet Refer to section 2 1 2 2 Re...

Страница 7: ...OMPRESSOR 1 Remove the cabinet Refer to section 2 1 2 2 Discharge the refrigerant by using a Refrigerant Recovery System 3 Disconnect the 3 leads from the compressor 4 After purging the unit completely unbraze the suction and discharge tubes at the compressor connections 5 Remove the 3 nuts and the 3 washers which fasten the compressor See Fig 10 6 Remove the compressor 7 Re instill the components...

Страница 8: ...d by the special cord The special cord means the cord which has the same specification marked on the supply cord fitted to the unit 2 3 5 THERMISTOR 1 Remove the control box Refer to section 2 1 3 2 Unfold the control box Refer to section 2 3 3 3 Disconnect the thermistor terminals from main P W B assembly 4 Remove the thermistor 5 Re install the components by referring to the removal procedure ab...

Страница 9: ...erant completely 4 Remove the 3 screws which fasten the evaporator at the left side and the top side 5 Move the evaporator sideward carefully and then unbraze the interconnecting tube at the evaporator connectors 6 Remove the evaporator 7 Re install the components by referring to notes See Fig 16 2 4 3 CAPILLARY TUBE 1 Remove the cabinet Refer to section 2 1 2 2 Remove the brace Refer to section 2...

Страница 10: ...er See Fig 17B Open valve C Discharge the line at the manifold connection 5 The system is now ready for final charging 6 Recharge as follows 1 Refrigeration cycle systems are charged from the High side If the total charge cannot be put in the High side the balance will be put in the suction line through the access valve which you installed as the system was opened 2 Connect the charging cylinder a...

Страница 11: ... Brazing equipment Pinch off tool capable of making a vapor proof seal Leak detector Tubing cutter Hand Tools to remove components Service valve A COMPOUND GAUGE EVAPORATOR LOW PRESSURE SIDE COMPRESSOR CAPILLARY TUBE CONDENSER HIGH PRESSURE SIDE SEE INSETS BELOW MANIFOLD GAUGE B Figure 17A Pulling Vacuum Figure 17B Charging A B EXTERNAL VACUUM PUMP A CHARGING CYLINDER LOW HI B C ...

Страница 12: ...event air and insects from getting into the room 8 The power cord must be connected to an independent circuit The green wire must be grounded 9 Connect the drain tube to the base pan hole in the rear side if you need to drain consult a dealer Plastic hose or equivalent may be connected to the drain tube 3 2 HOW TO USE THE REVERSIBLE INLET GRILLE The grille is designed to clean the filter both upwa...

Страница 13: ... The top and bottom window sashes must open sufficiently to allow a clear vertical opening of 18 from the bottom of the upper sash to the window stool 2 The stool offset height between the stool and sill must be less than 1 1 4 3 4 INSTALLATION KITS CONTENTS 29 to 41 18 min Offset Less than 1 1 4 Sill Exterior Interior wall 26 min Without frame curtain Stool Foam PE Adhesive Backed Foam PE Adhesiv...

Страница 14: ...ff the backing and attach the Foam PE to the underside of the window sash 4 Remove the backing from Foam PE with 3 holes and attach it to the bottom of the Top retainer bar 5 Attach the Top retainer bar onto the top of the cabinet with 3 screws Type A 6 Insert the Frame guides into the bottom of the cabinet 7 Insert the Frame Curtain into the Top retainer bar and Frame guides 8 Fasten the curtains...

Страница 15: ...nd the lock nut Be sure the cabinet slants outward CAUTION Do not drill a hole in the bottom pan The unit is designed to operate with approximately 1 2 of water in bottom pan 4 Pull the bottom window sash down behind the Top retainer bar until they meet NOTE 1 Do not pull the window sash down so tightly that the movement of Frame curtain is restricted Attach the cabinet to the window stool by driv...

Страница 16: ...ut the Foam strip to the proper length and insert between the upper window sash and the lower window sash See Fig 29 9 Attach the Window locking bracket with a screw Type C See Fig 30 10 Attach the front grille to the cabinet by inserting the tabs on the grille into the tabs on the front of the cabinet Push the grille in until it snaps into place See Fig 31 11 Lift the inlet grille and secure it w...

Страница 17: ...heir functions in the refrigeration system Refer to Fig 33 to follow the refrigeration cycle and the flow of the refrigerant in the cooling cycle MOTOR COMPRESSOR OIL LIQUID REFRIGERANT CAPILLARY TUBE OUTSIDE COOLING AIR FOR REFRIGERANT PASS THROUGH SUCTION LINE COOL LOW PRESSURE VAPOR COOLED AIR COMPLETE LIQUID BOIL OFF POINT LIQUID PRESSURE DROP ROOM AIR HEAT LOAD VAPOR INLET HOT DISCHARGED AIR ...

Страница 18: ...tdoor coil heat exchanger the fan operation Check gas leakage Repair gas leak Replacement of unit if the unit is beyond repair Satisfactory operation with temperature difference of inlet outlet air 44 6 50 F Check heat load increase Unexpected residue Overloaded Circuit Check of inside gas pressure Adjusting of refrigerant charge Malfunction of compressor Replacement of compressor Check of cold ai...

Страница 19: ...otor resistance Irregular motor insulation Replacement of fan motor Regular but fails to start Replacement of compressor locking of rotor metal Improper thermistor setting Loose terminal connection Improper wiring Irregular motor resistance Irregular motor insulation Replacement of compressor Motor damaged Drop of power voltage Check capacitor Replacement Only compressor fails to start Defect of c...

Страница 20: ...he voltage No 18 of Micom DC 5V Exchange Main P W B Ass y Is the connection between Main and Display all right Is the reset circuit all right The No 14 of Micom is 5V Check the Fuse Check the wiring diagram Check the Main P W B pattern Exchange the Trans Exchange D02D D05D Exchange IC01D Exchange IC02D Exchange IC01A Connect connector exactly Check the P W B pattern NO NO NO NO NO NO NO YES YES YE...

Страница 21: ...e voltage N0 7 of IC01M DC 5V Check the RY COMP Check the wiring Diagram NO NO NO NO YES YES YES YES Possible Trouble 2 The compressor does not operate Is the wire connection of RY COMP all right Check the RY COMP Connect LEAD Wire to RY COMP again NO YES Possible Trouble 3 The compressor always operate Exchange IC01M Exchange IC01M Is the voltage NO 1 or 2 or 4 of IC01M DC 5V Is the voltage NO 13...

Страница 22: ...P W B Ass y DC 5V Exchange the battery Check the P W B pattern Connect connector to CN DISP1 exactly NO NO NO YES YES YES NO NO YES YES Is the Knob of SW1 set to left position Is the voltage No 1 of CN DISP1 of Main PCB Ass y DC 5V Reference to OWNER S MANUAL Set the Knob of SW1 to left position Check the SW1 Check the pattern of Main Display PCB Possible Trouble 6 Romote controller does not opera...

Страница 23: ...NO NO YES YES YES Is the IC01G all right Is the connection of CN DISP1 all right Exchange the display P W B Ass y Exchange IC01G Exchange Q01G Q02G Q03G Q04G Connect connector to CN DISP1 exactly Does the Q01G Q02G Q03G Q04G operate normally on main P W B Ass y Possible Trouble 7 It displays abnormally on Display P W B Ass y ...

Страница 24: ...l identification Repair or replace loose terminal Capacitor Discharge Test capacitor capacitor before testing 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 Re align assembly Units using slinger ring condenser fans must have 0 22 0 25 inch clearance to the base If necessary shim up the bot...

Страница 25: ...am correct the connections Rotary Check for continuity refer to the wiring diagram for terminal identification Replace the switch if the 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 Check the capacitor capaci...

Страница 26: ...sor to cycle Straighten the fins or replace the coil Capacitor Test the capacitor Wiring Check the terminals If loose repair or replace Refrigeration system Check the system for a restriction Insufficient cooling Air filter If restricted clean or replace Exhaust damper door Close if open Unit undersized Determine if the unit is properly sized for the area to be cooled Excessive noise Blower or fan...

Страница 27: ...CN WORK CN SYNC CN DISP DISPLAY P W B ASM RY SYNC 250V T2A 115V T2A TRANS FORMER ZNR RY COMP MAIN P W B ASM BK BK BR BR RD BL BL OLP RD MOTOR CAPACITOR F R S COMP C C H 3854AR2330P WIRING DIAGRAM RY MID FUSE RD BK PTC 4 3 WH BL POWER INPUT BK BR Ribbed Plain GN YL GN GN YL GN THERMISTOR BK BK BL RD BL RD CN TH YL YL OR BR OR BR OR BR SYNC MOTOR RY LO RY HI CN WORK CN SYNC CN DISP DISPLAY P W B ASM...

Страница 28: ...EEPROM 2 1 A0 A2 SCL SDA GND 4 3 A1 5V Rx 12 Tx 8 9 10 SDA SCL 11 TEST 15 14 13 17 19 18 VSS VAref 16 Osc in Osc out Reset 22 21 20 COMP 4WAY LOW SYNC 24 25 26 23 Pipe TH Option1 Option2 Room TH 5 6 7 1 2 3 SEG c SEG a SEG b 4 MICOM TMP87CH47U SEG d 44 SEG e SEG f 43 42 41 SEG g VDD 39 38 37 KEY0 40 SLIDE SW 27 28 29 ION MED HI 31 32 33 Buzzer 30 Receiver LED out3 36 35 34 LED out0 LED out1 LED ou...

Страница 29: ...9 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only 5 3 COMPONENTS LOCATION FOR MAIN P C B ASM 5 4 COMPONENTS LOCATION FOR DISPLAY P C B ASM ...

Страница 30: ...ice purposes LGE Internal Use Only 6 EXPLODED VIEW 152302 135303 147581B 147581A 135312 552102 554031 148000 352390 349600 346811 130410 354210 147582 349001 359012 349480 559011 267110 149980 554160 352113 35211A 352111 263230 268711A 146812 264110 268711B 237200 238310 249950 130910 ...

Страница 31: ...P NO 3828A20095H FEBRUARY 2008 ...

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