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.
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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.
- Inspect hoses, connections, and visible wiring for damage, clogs, or loose fittings related to F4.
- Model note for LMV2031ST: Hold Clear/Stop 3 seconds to clear LOC control lock.
- Run a test cycle after repair. If the code returns, use the compatible parts below or the full brand code guide.
Guided repair checklist
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Verify the model tag reads LMV2031ST — Inside the microwave door frame when the door is open.
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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.