LG LMV2031ST Repair Guide
A 2.0 cu ft over the range microwave with LG’s EasyClean interior and sensor cooking. Large capacity for the class, and the extra cavity volume is the main reason people choose it over the 1.6 and 1.7 cu ft units it competes with.
LG LMV2031ST is an over the range microwave, 2.0 cu ft microwave sold 2016 to present. Its most common repair is cooks slowly or not at all, usually $170 to $420.
- 5 common problems with causes, fixes and costs below.
- 3 error codes decoded.
- A microwave like this lasts about 7 to 10 years.
- Check the model and serial tag before you order any part.
Common problems & typical repair costs
| Problem | Likely cause | Typical fix | OEM part # | Typical cost |
|---|---|---|---|---|
| Cooks slowly or not at all | Magnetron degradation or diode failure | Professional high voltage diagnosis and repair | not listed | $170 to $420 |
| Dead unit, no lights | Interlock switch failure taking out the fuse | Replace interlock switches and fuse | not listed | $120 to $270 |
| Arcing during cooking | Waveguide cover damage or metal contact in the cavity | Replace waveguide cover. Remove metal items | not listed | $5 to $60 |
| Turntable not rotating | Coupler stripped or turntable motor failed | Replace coupler. Motor requires cabinet access | not listed | $10 to $200 |
| Vent fan noisy | Blower wheel loose or bearings dry | Replace blower motor assembly | not listed | $150 to $320 |
Costs are national averages for professional repair (parts + labor). See the linked cost guides below for full breakdowns.
Error codes
| Code | What it means |
|---|---|
| F3 | Key stuck on the touch panel |
| F5 | Humidity sensor fault |
| F7 | Control board communication error |
Tech notes
The EasyClean cavity coating on this model is worth protecting, avoid abrasive pads and oven cleaner entirely. Once that coating is scoured through to bare metal, the cavity arcs, and a cavity that arcs on bare metal is the end of the appliance rather than a repair.
Sources
Where the safety, regulatory and warranty claims on this page come from. Repair costs are our own figures based on Arizona market rates and OEM parts pricing.
- Microwave Ovens, Radiation Emitting Products U.S. Food & Drug Administration The federal requirement for two independent door interlocks plus a monitoring system, and the 21 CFR 1030.10 leakage limit, why an interlock must never be bypassed.
Cost guides for this machine’s common repairs
DIY step by step instructions for this model
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