The LG LMX25986ST 00 is a 25.8 cubic foot French Door refrigerator with InstaView Door-in-Door, linear compressor technology, smart cooling system, water and ice dispenser, and ENERGY STAR certification. This service manual provides comprehensive technical information for qualified service technicians, including disassembly procedures, component specifications, troubleshooting guides, and wiring diagrams for proper maintenance and repair.
Before performing any service procedures, read and understand all safety warnings and precautions to prevent personal injury and equipment damage.
| Hazard Type | Precaution |
|---|---|
| Electrical Shock | Disconnect power before servicing. Use insulated tools. |
| Refrigerant | Wear protective gloves and goggles when handling refrigerant lines. |
| Sharp Edges | Wear cut-resistant gloves when handling evaporator coils and metal parts. |
| Heavy Components | Use proper lifting techniques for compressor and condenser units. |
| Chemical Exposure | Avoid contact with insulation materials and refrigerants. |
Key components and their locations for service access and replacement procedures.
| Component | Location | Function |
|---|---|---|
| Linear Compressor | Bottom rear | Refrigeration cycle operation |
| Main Control Board | Top rear panel | System operation control |
| Evaporator Fan Motor | Freezer compartment | Air circulation |
| Condenser Fan Motor | Bottom rear | Heat dissipation |
| Temperature Sensors | Multiple locations | Temperature monitoring |
| Water Inlet Valve | Bottom left rear | Water supply control |
| Ice Maker Assembly | Freezer door | Ice production and dispensing |
Step-by-step instructions for accessing and replacing major components.
WARNING! Always disconnect power and recover refrigerant before opening sealed system.
Electrical specifications and testing procedures for system components.
Refrigerant circuit specifications and service procedures.
| Parameter | Specification |
|---|---|
| Refrigerant Type | R-600a (Isobutane) |
| Refrigerant Charge | 2.5 oz ± 0.2 oz |
| High Side Pressure | 150-200 PSIG |
| Low Side Pressure | 0-5 PSIG |
| Compressor Oil | Polyolester (POE) Oil |
| Evaporator Temperature | -10°F to 10°F |
Electronic control system operation and diagnostic procedures.
Common symptoms, possible causes, and corrective actions.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No cooling | Compressor failure, control board issue, refrigerant leak | Check compressor operation, test control outputs, leak test system |
| Excessive frost | Defrost system failure, door seal leak, sensor fault | Test defrost components, check door alignment, replace sensors |
| Water leakage | Clogged drain, cracked water line, dispenser issue | Clear drain tube, inspect water connections, check dispenser valve |
| No ice production | Water supply issue, ice maker failure, control problem | Check water pressure, test ice maker components, verify control signals |
| Display errors | Control board failure, wiring issues, power supply | Test board voltages, check wiring continuity, verify power input |
Common replacement parts with part numbers and descriptions.
Complete electrical schematics for system troubleshooting and repair.
Main Power Circuit: AC input, main board power supply, compressor circuit
Control Circuit: Microprocessor, sensor inputs, display interface, communication lines
Defrost System: Defrost heater, defrost thermostat, control relays
Water System: Water valve, ice maker, dispenser switch circuits
Note: Refer to detailed wiring diagrams in PDF manual for complete schematics.
Error codes and their meanings for diagnostic purposes.
| Error Code | Description | Action Required |
|---|---|---|
| ER-IF | Communication error | Check wiring between boards |
| ER-FF | Freezer sensor error | Replace freezer temperature sensor |
| ER-RF | Refrigerator sensor error | Replace refrigerator temperature sensor |
| ER-DS | Defrost sensor error | Replace defrost temperature sensor |
| ER-CF | Condenser fan error | Check condenser fan motor and wiring |