The LG LMX25981ST is a high-performance appliance requiring specialized service procedures. This manual provides authorized service technicians with essential information for installation, troubleshooting, repair, and maintenance. It includes safety warnings, technical specifications, disassembly/assembly instructions, wiring diagrams, and parts lists. Use this manual in conjunction with proper tools and training to ensure safe and effective service.
Before servicing, read all safety instructions. Disconnect power before accessing internal components.
| Hazard | Precaution |
|---|---|
| Electrical Shock | Unplug unit or disconnect power at circuit breaker. Verify with voltage tester. |
| Sharp Edges | Wear cut-resistant gloves when handling internal components. |
| Hot Surfaces | Allow unit to cool completely before disassembly. |
| Heavy Parts | Use proper lifting techniques; get assistance for heavy components. |
| Refrigerant (if applicable) | Only EPA-certified technicians may handle refrigerant lines. |
WARNING! Failure to follow safety procedures may result in injury, death, or product damage.
Proper installation is critical for performance and safety.
CAUTION! Installation by qualified personnel only. Improper installation voids warranty.
Understanding normal operation aids in diagnosis.
Control Panel: Describes buttons, indicators, and display symbols. Standard Cycle: Sequence of events (e.g., fill, heat, wash, drain, dry). Error Codes: List of common display codes and their meanings (e.g., F1, F5, LE).
Step-by-step guide to access internal components. Perform in order.
Tip: Take photos during disassembly and bag/organize all screws.
Wiring diagrams and schematic located in appendix. Key electrical components:
| Component | Function | Test Point/Resistance |
|---|---|---|
| Main Control Board | Governs all cycles and inputs. | Check for 5V/12V DC at regulator. |
| Door Lock Switch | Safety interlock. | Continuity check when latched. |
| Heating Element | Heats water/air. | Measure resistance (typically 10-50 Ω). |
| Motor/Windings | Drives drum/pump. | Check for shorts/opens between phases. |
| Thermal Fuse/Cutoff | Overheat protection. | Continuity check. |
Use multimeter to verify component functionality before replacement.
| Symptom / Error Code | Possible Cause | Corrective Action |
|---|---|---|
| No Power / No Display | Power cord, outlet, main fuse, control board. | Verify outlet power. Check continuity of power cord. Test/replace main fuse on control board. |
| Will Not Start / Door Lock Error | Door not closed properly, faulty door latch/lock switch, wiring. | Inspect door alignment. Test door lock switch continuity. Check harness for damage. |
| No Heat / Underheating | Heating element, thermal fuse, thermostat, control board relay. | Test heating element resistance. Check thermal fuse for continuity. Verify control signal to heater relay. |
| Excessive Noise / Vibration | Unlevel unit, foreign object, worn motor bearings, loose components. | Re-level unit. Inspect drum for obstructions. Check motor mounts and bearings. |
| Water Leakage | Loose hose connections, damaged tub seal, clogged drain pump filter. | Tighten all hose clamps. Inspect door boot/tub seal. Clean drain pump filter. |
| Fault Code [e.g., F5] | Motor control fault, tachometer error, blocked drain. | Clear drain line. Check motor wiring and hall sensor. Test motor control module. |
Reference diagrams [Diagram A, B, C] for part locations. Key replacement parts include:
Note: Always use genuine LG parts for repair. Part numbers subject to change.
Warranty: LG standard limited warranty applies. Unauthorized repairs may void warranty. Keep proof of purchase.
Service Contacts:
LG Customer Support: 1-800-243-0000
LG Service Website: www.lg.com/us/support
Authorized Parts Distributor: 1-888-542-2623
Manual Revision: 1.0
Publication Date: [Date]
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