LMV2031ST F4 error
Your LG LMV2031ST is showing F4. Before replacing parts, confirm the model tag matches LMV2031ST: Inside the microwave door frame when the door is open. Hold Clear/Stop 3 seconds to clear LOC control lock. On this LG microwave, F4 means Microwave sensor error. The steps below follow the field-service order for the LMV2031ST platform — not the generic LG F4 page. Cross-check part fit with LMV2031ST before ordering — use the model-specific parts diagram. If the code cleared after a reset but returned mid-cycle, treat that as a confirmed fault rather than a one-time glitch.
Fix steps
- Verify the model tag reads LMV2031ST — Inside the microwave door frame when the door is open.
- Reset F4: unplug the microwave or switch off the breaker for 5 minutes, then restore power.
- Run the first check for F4 on this model: Microwave sensor error
- Cross-check part fit with LMV2031ST before ordering — use the model-specific parts diagram.
- Run a test cycle after repair. If the code returns, use the compatible parts below or the full brand code guide.
Repair guidance is for informational purposes only. We do not guarantee that any fix will resolve your issue, and you assume all risk when following these steps. Terms & disclaimer
FAQ
What does F4 mean on a LG LMV2031ST?
Microwave sensor error.
How do I reset F4 on a LMV2031ST?
Unplug the microwave or switch it off at the breaker for 5 minutes, then restore power and restart. If F4 returns on the LMV2031ST, the underlying fault is still present.
What part do I need for LMV2031ST F4?
Try the reset and troubleshooting steps first. F4 on the LMV2031ST is not always a failed part.
Is F4 on the LMV2031ST easy to fix?
Many owners fix this themselves with basic tools. Start with the reset and steps above, then check compatible parts below.