LG LMV1764ST Repair Guide
A compact height over the range microwave that fits where taller 2.0 cu ft units will not. EasyClean interior, sensor cooking, and the usual LG over the range service pattern.
LG LMV1764ST is an over the range microwave, 1.7 cu ft, easyclean microwave sold 2016 to present. Its most common repair is cooking weakly or not at all, usually $170 to $405.
- 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 |
|---|---|---|---|---|
| Cooking weakly or not at all | Magnetron degradation or diode failure | Professional high voltage diagnosis | not listed | $170 to $405 |
| Unit dead | Interlock failure and blown fuse | Replace switch set and fuse | not listed | $115 to $265 |
| Arcing during cooking | Waveguide cover burned or metal in the cavity | Replace waveguide cover. Remove metal | not listed | $5 to $60 |
| Vent fan noisy | Blower bearings dry | Replace blower motor | not listed | $150 to $320 |
| Turntable stopped | Coupler stripped or motor failed | Replace coupler. Motor needs cabinet access | not listed | $10 to $200 |
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 communication error |
Tech notes
Never let an abrasive pad or oven cleaner near the EasyClean coating. Once it is scoured through to bare metal the cavity arcs on the exposed steel, and that ends the appliance.
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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