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LG LP126HD3B, Svc Manual

The LG LP126HD3B is a high-performance air conditioner that offers exceptional cooling capabilities. For detailed instructions on installation, maintenance, and troubleshooting, the user manual is available for free download from manualshive.com. The Svc Manual is readily accessible, ensuring a seamless experience with your LG LP126HD3B unit.

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Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes

LGE Internal Use Only

1.3 SELF-DIAGNOSIS

FUNCTION:

If the unit has a malfunction, a green OPERATION LED located on the Display PCB used by the unit to
indicate the 

fault codes

.

USE:

If the customer has to register a complaint to the service center, he can be very clear about registering
the complaint that what is happening & by referring the user's manual the customer can clearly define
the problem.
So that the engineer should go fully prepared with the prescribed tools to be used regarding that
problem. It also keeps the customer aware about the unit.
Here are some of the problems defined below for which the LED indicates by flashing.
The 

fault codes

 are the mentioned which is as follows:

•

 Electrical Controls

•

 Overheating Protection

This feature prevents melting of unit by electrical heater located inside of the unit at the remote
mode (when the unit is connected with wall thermostat). LED on the control panel displays
"OP"

•

 Freeze Protection

This feature prevents freezing of room at low temperature.
LED on the control panel displays "FP"

NOTICE

ON

Normal

OFF

No power / failed board

Fault Codes

CH 01

Indoor Air Thermistor Error

CH 02

Indoor Coil Thermistor Error

CH 07

Themostat Wiring Error

CH 09

EEPROM Check Sum Error

CH 10

Indoor Fan Error

CH 34

High Pressure Switch Error

CH 44

Outdoor Air Thermistor Error (PTHP Only)

CH 45

Outdoor Coil Thermistor Error (PTHP Only)

CH 67

Outdoor Fan Error

Summary of Contents for LP126HD3B

Page 1: ... Conditioner Heat Pump SVC MANUAL Exploded View MODEL LP126HD3B 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: ... Evaporator Rows Column FPI Φ9 2R 10C 19FPI Condensor Rows Column FPI Φ7 3R 17C 20FPI No MM2 3 3 3 12AWG mm 1 066 406 505 inch 42 16 19 7 8 kg lbs 48 105 8 YA Thermistor Prefilter washable anti fungus 2 2 2 Manual Wall Thermostat Cooling 54 86 12 2 30 Heating 54 86 12 2 30 Micom 12h On Off Rear L Look Slide In Out Electric Heater Special Function Auto Operation Micom Control Setting Temperature Ra...

Page 3: ...um of three minutes to have a time of equalizing the refrigerant pressures for optimizing cycling Fan Only Setting High Low The fan can run at HIGH or LOW speed without COOLING or HEATING to provide air circulation and ventilation Indoor Fan Speed Selections High Low The fan can run at HIGH or LOW speed for either COOLING or HEATING Two Fan motors The unit has two fan motors to provide quiet opera...

Page 4: ... unit has a condensate drain valve to prevent water from collecting or freezing in the basepan Quick Heater Recovery The unit is designed to operate the electric heater to warm the room to the temperature set point as soon as heat pump cycle is on in heating This feature has an advantage of reducing the time to reach the set point and improving the temperature increase for better comfort Reverse C...

Page 5: ...sary in the room set the ventilation lever to the OPEN position The damper is opened and outdoor air is drawn into the room This will reduce the cooling or heating efficiency When the air conditioner has performed a cooling or heating operation and is turned off or set to the fan position wait at least 3 minutes before resetting to the cooling operation A slight heat odor may come from the unit wh...

Page 6: ...unit Here are some of the problems defined below for which the LED indicates by flashing The fault codes are the mentioned which is as follows Electrical Controls Overheating Protection This feature prevents melting of unit by electrical heater located inside of the unit at the remote mode when the unit is connected with wall thermostat LED on the control panel displays OP Freeze Protection This f...

Page 7: ...FF 3 OFF 4 OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 ON ON REMOTE OFF ON ON ON Remote Local Energy Saver Temperature Limit 1 Temperature Limit 2 Temperature Limit 3 PTAC PTHP UNIT TYPE LOCAL LOCAL 1 OFF OFF 2 OFF OFF 3 OFF OFF 4 OFF OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 LOCAL LOCAL 1 OFF OFF 2 OFF OFF 3 OFF OFF 4 OFF OFF 5 LOCAL 1 OFF 2 OFF 3 OFF 4 OFF 5 OFF 6 OFF 7 LOCAL LOCAL 1 OFF OFF 2 OFF OFF 3 O...

Page 8: ...ch located at the Front Desk Control panel When the front desk switch is ON the fan operates according to the setting without working compressor and heater When the front desk switch is OFF the unit can operate according to the setting of controls REMOTE WALL THERMOSTAT When the wires are connected the unit will be controlled by a remote wall thermostat The thermostat connections supply the 24 Vol...

Page 9: ...nto place This Room Air Conditioner PTAC discharges air from the top of the unit through reversible 2 position discharge grille louvers The unit is shipped from the factory with the discharge grille louvers at an angle of 40 off vertical In the alternate position the louvers will be at an angle of 15 off vertical To adjust air direction remove the front grille Remove the 4 screws that fasten the d...

Page 10: ...to section 2 1 1 2 Remove the two screws which fasten the control box See Figure 2 3 Pull the control box from the Air guide 4 Remove the control box cover See Figure 3 5 Disconnect wire housings on the control box 6 Pull the control box assembly out from the unit See Figure 4 7 Re install the components by referring to the removal procedure Figure 2 Figure 3 Figure 4 ...

Page 11: ...ectric heater assembly Electric heater model only See Fig 5 5 Loosen the hexagon screw with the Hex wrench See Fig 6 6 Remove the 4 screws which fasten the indoor motor and the earth wire See Fig 6 7 7 Re install the components by referring to the removal procedure above 2 2 2 FAN 1 Remove the brace 2 Remove the 4 screws which fasten the condenser with the shroud and the basepan 3 Move the condens...

Page 12: ...charge the refrigerant system using a refrigerant recovery system If there is no valve to attach the recovery system install one such as a WATCO A 1 before venting the refrigerant Leave the valve in place after servicing the system 2 Disconnect the 3 leads from the compressor 3 After purging the unit completely unbraze the suction and discharge tubes at the compressor connections 4 Remove the 3 nu...

Page 13: ...und connection 7 If the supply cord of this appliance is damaged it must be replaced by an exact replacement part The special cord means the cord which has the same specification marked on the supply cord fitted to the unit 2 3 6 P C B 1 Remove the all screws which fasten P C B cover 2 Disconnect all the leads which connected to the P C B 3 Remove the two screws which fasten the P C B board 4 Re i...

Page 14: ...Discharge the refrigerant completely 3 Remove the control box assembly Refer to section 2 1 2 4 Remove the 4 screws which fasten the evaporator at the left side and the right 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 Figure 16 2 4 3 CAPILLARY TUBE...

Page 15: ... 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 as shown in Figure 16B With valve C open discha...

Page 16: ...ent pinch off tool capable of making a vapor proof seal leak detector tubing cutter hand tools to remove components service valve A COMPOUND GAUGE R410A EVAPORATOR LOW PRESSURE SIDE COMPRESSOR CAPILLARY TUBE CONDENSER HIGH PRESSURE SIDE SEE INSETS BELOW MANIFOLD GAUGE B Figure 16 A Pulling Vacuum Figure 16 B Charging A B EXTERNAL VACUUM PUMP COMPOUND GAUGE R410A A CHARGING CYLINDER LOW HI B C ...

Page 17: ...ront Insulation Strip Rear Sleeve 280 mm 11 Over 20 HEAT RADIATION WALL WALL INSULATION SLEEVE INTAKE AIR COOLED AIR 1 4 Bubble of the level 13 3 4 42 TOP VIEW GRILLE ROOM CABINET Over 20 When installing the sleeve Front grille make certain there is nothing within 20 back front of sleeve front grille that would interfere with heat radiation and exhaust air flow 1 Take out the insulation strip from...

Page 18: ... case may be installed flush with the finished indoor wall Mounting an outdoor grille or louver section to the building face may cause a space between the outdoor coil and the louver section Air splitters aligned with the ends of the outdoor coil must be installed between the outdoor coil inlet and outlet air streams Gaps between the outdoor coil and the louver section may allow condenser air reci...

Page 19: ...mum exterior dimensions are not met refer to FRAME AND BRICK VENEER INSTALLATION The outside edge of the wall case should extend at least 1 4 beyond the outside wall This is necessary for proper caulking to prevent sealing thedrain holes in the rear flange of the wall case and to facilitate the installation of an accessory drain if used 2 The wall case should be secured to the wall at both sides U...

Page 20: ... 20 Copyright 2010 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 21: ...SE OUTDOOR GRILLE CAULK CAULK 1 4 MIN POWER SUPPL Y CONDUIT WALL RECEPTACLE BY OTHERS FINISHED FLOOR OR TOP OF CARPET Caulk around perimeter of wall case all four sides where it joins the building Interior and Exterior CAULK 1 4 CAULK LINTEL ROOM CABINET 2 MIN MOUNTING SCREWS BY INSTALLER WALL CASE OUTDOOR GRILLE SIDE CHANNEL 3 MIN 5 MAX 1 5 16 FINISHED FLOOR OR TOP OF CARPET SUB BASE RAK204 CAULK...

Page 22: ...or See Figure 1 2 Remove the front gille by pulling it out at the bottom to release it then lift it up along the unit top front See Figure 2 3 Slide the unit into the wall sleeve and secure with 6 screws through the unit flange holes See Figure 3 4 Reinstall the front grille by hooking the top over the unit top then pushing it in at the bottom See Figure 4 Figure 1 Figure 2 Figure 3 Figure 4 ...

Page 23: ...GROUNDING INSTRUCTIONS The air conditioner has a three prong grounding plug on its power supply cord which must be plugged into properly grounded three prong wall receptacle for your protection against possible shock hazard FUSE Use a time delay fuse or circuit breaker Refer to the nameplate for proper power supply requirements 265 VOLT UNITS These units are equipped with a three prong grounding p...

Page 24: ...s Figure 22 3 Install the new door assembly with the key lock by bowing the door with both hands and aligning the door hinge pins with their bracket in the front Figure 23 Important Note Personal Risk Hazard Underwriterʼs Laboratories Inc listed For institutional use only where supervisory monitoring is available Any other use may increase the risk of personal injury or property damage Note The in...

Page 25: ...ote it on the delivery receipt Unit must be stored in its original shipping carton in a dry secure place prior to its installation and use Installation The installation and servicing of the equipment referred to in this booklet should be performed by qualified experienced technicians WARNING Hazardous Voltage Disconnect all electric power including remote disconnects before servicing Follow proper...

Page 26: ...7 Then install one of the three rubber elbows ref Figure 31 at the inlet of the spraying tube and through the rubber grommet 10 Place the top cover assembly back into the unit 11 Install tube 1 and tube 2 ref Figure 31 on the pump assembly using the rubber elbows as shown in Figure 28 12 Position pump assembly to the basepan as shown in Figure 29 and fasten the pump bracket to the basepan using th...

Page 27: ...own in Figure 32 34 whichever is applicable Make sure to fasten the pump wire through the wire clip on the back side of the control barrier as shown in Figure 33 15 Assembly the unit back following the reverse order of disassembly NOTE All tube should be inserted into rubber elbows by at least 1 2 Figure 31 Pump assembly Tube 1 Tube 2 Rubber elbows 3 Spraying Tube Figure 32 BL BL Figure 34 Figure ...

Page 28: ...m the sleeve These items may be removed from inside of the building Note The sleeve stiffener must be taken out before the rear sleeve enclosure panel can be removed from the sleeve 2 Prepare the stamped aluminum grille for installation on the sleeve by inserting the six 6 plastic grommets into the square holes located near the outer edges of all four sides of the grille With the grille positioned...

Page 29: ...er before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit Receiving Upon receipt of the product inspect the shipping carton for signs of visible damage Report any damage or shortage to the carrier and note it on the delivery receipt The product must be stored in its original shipping carton in a dry secure p...

Page 30: ... A on the back of blank off plate C and secure the assembly to the left rear of wall sleeve with sheet metal screws provided See Figure 39 for finished left hand side installation If the unit chassis is to be installed right away install the condenser grille to wall sleeve with hardware provided See condenser grille installation instructions If the unit chassis will not be installed right away rep...

Page 31: ...cted to the drain system inside of the building Install the two blank off plates C and gaskets A on the outdoor portion of the wall sleeve as shown in Figure 40 These components may be installed after the sleeve is secured in the wall opening just prior to the installation of the condenser grille and chassis Leveling Legs Model AYLL101 Description Leveling legs are designed to provide extra front ...

Page 32: ...side to side Provide a slight slope one quarter bubble in the sight glass toward the outside Check the level again after the unit has been installed Adjust the legs as needed Installation on Wall Sleeve 1 Drill four 1 8 diameter holes in the wall sleeve two on each side using the leveling legs as a template Caulk around screws to prevent water leaks 2 Attach the legs to the wall sleeve using the s...

Page 33: ...ocedures to ensure the power can not be inadvertently energized Failure to disconnect power before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit CAUTION Use Copper Conductors Only Unit terminals are not designed to accept other types of conductors Failure to use copper conductors may result in equipment da...

Page 34: ...iscard the red lead from the wire assembly 2 Connect the black lead to the center terminal of the fuse holder 3 Connect the white lead to the common C terminal on the capacitor 4 Connect the ground wire to the partition panel where the ground wire on the power cord was located Use the supplied green ground screw 5 Connect the white lead of the wire assembly at the junction box to the white lead of...

Page 35: ... not disconnect all electrical power to this unit CAUTION Use Copper Conductors Only Unit terminals are not designed to accept other types of conductors Failure to use copper conductors may result in equipment damage Important Note All wiring must comply with applicable local and national codes Type and location of fused disconnect switch es must comply with all applicable codes Failure to follow ...

Page 36: ...older Kit Installation With Subbase See previous section for installation in the control panel 1 Remove both knockouts at the fuse holder location Figure 50 2 Install the fuse holders using screws provided The side connector tab on the fuse holders should be towards the left 3 Connect a stripped BK 9 wire to the center of the quick connect tab of the fuse holders Wire nut the other end of this wir...

Page 37: ... performed by qualified experienced technicians WARNING Hazardous Voltage Disconnect all electric power including remote disconnects before servicing Follow proper lockout tagout procedures to ensure the power can not be inadvertently energized Failure to disconnect power before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical ...

Page 38: ...onnects before servicing Follow proper lockout tagout procedures to ensure the power can not be inadvertently energized Failure to disconnect power before servicing could result in death or serious injury Important Note The unit OFF switch does not disconnect all electrical power to this unit CAUTION Use Copper Conductors Only Unit terminals are not designed to accept other types of conductors Fai...

Page 39: ...ring Access Subbase Box Assy Low Voltage Compartment 2 13 16 71 mm 11 13 16 300 mm A B F C E D D E Wall Sleeve Outdoor Side Wall Sleeve Inside Edge Back of Flange A 13 3 4 2 3 4 2 5 8 13 7 8 352 mm 3 1 16 78 mm Left End View Concentric Knockouts In Bottom Ground Screw Location Receptacle Provided Inside subbase Accessory Top View Concentric Knockouts In Rear Field Wiring Line Voltage Field Wiring ...

Page 40: ...1 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 LIME COOL LOW PRESSURE VAPOR COOLED AIR COMPLETE LIQUID BOIL OFF POINT LIQUID PRESSURE DROP ROOM AIR HEAT LOAD VAPOR INLET HOT DISCHARGED AIR LIQUID OUTLET HIGH PRESSURE VAPOR LIQUID PEFRIGERANT LOW ...

Page 41: ...g 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 7 10 C Check heat load increase Unexpected residue Overloaded Circuit Check of inside gas pressure Adjusting of refrigerant charge Malfunction of compressor Replacement of compres...

Page 42: ...capacitor Irregular motor resistance Irregular motor insulation Replacement of fan motor Regular but fails to start Replacement of compressor locking of rotor metal Improper thermostat 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...

Page 43: ... of the fan motor with mounting screw s Check fan motor bearings if motor shaft will not rotate replace the motor Check voltage See limits on this page 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 Check grommets ...

Page 44: ...k the position of knob If not at the coldest setting advance the knob to this setting and restart unit Check continuity of the thermostat Replace thermostat if circuit is open Check the capacitor Replace if not within 10 of manufacturers rating Replace if shorted open or damaged Check the compressor for open circuit or ground If open or grounded replace the compressor Check the compressor overload...

Page 45: ...e closed over a large area on the coil surface head pressures will increase causing the compressor to cycle Straighten the fins or replace the coil Test capacitor Check the terminals If loose repair or replace Check the system for restriction If restricted clean of replace Close if open Determine if the unit is properly sized for the area to be cooled Check the set screw or clamp If loose or missi...

Page 46: ...K VALVE HEAT EXCHANGE CONDENSER COMPRESSOR ACCUMULATOR Cooling Heatig REVERSING VALVE High Pressure S W 41 8 32 6 kgf cm2 G 595 463 lbf in2 G H P HEAT EXCHANGE EVAPORATOR Th1 Th2 LOC Description PCB Connector Th1 Thermistor for indoor Air temperature CN IDAT Th2 Thermistor for evaporating temperature CN IDPT Th3 Thermistor for outdoor Air temperature CN ODT Th4 Thermistor for condenser Air tempera...

Page 47: ...OTOR YL BL WH BK RD YL BL WH BK RD BK BK Pressure Switch BK BK BK BK F HERM BL RD BR OLP R COMP WH TB1 POWER INPUT INDOOR AIR THERMISTOR INDOOR COIL THERMISTOR OUTDOOR AIR THERMISTOR OUTDOOR COIL THERMISTOR CN IDPT CN IDAT2 CN MOTOR_IDF CN MOTOR_ODF CN CC_S CN WRITE_S CN CC CN WRITE WCN NOISE BK CN THERMO S CN AUX S CN DISP1 CN DISP2 CN DIP CN ODT 250V T3 15A FUSE S C WH CN_WRITE CN MOTOR_ODF CN M...

Page 48: ... ON OFF ON OFF ON OFF ON OFF 268711A 249940 249941 268711D 264110 552206 337000 263230C W5210B 263230A 263230B C 552113 352116 352115 W52106 435300A 261704 F 135515 552112 W50400 753000 8 Exploded View Note Please ensure GCSC since the replacement parts may be changed depending upon the buyer s request Please check the correct parts in View RPL Replacement Part List on GCSC GCSC Website http biz l...

Page 49: ...P NO MFL63264616 MARCH 2010 Service call Number 888 LG Canada 888 542 2623 Service call Number 1 888 865 3026 US CANADA ...

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