Microwave Not Heating
The cavity runs but food stays cold, or a thermal/humidity sensor code stops the cycle. Use the likely error codes and replacement parts below to diagnose and fix the problem on your microwave.
Fix steps
- Unplug the appliance before inspecting.
- Check for obvious issues: clogs, loose connections, or foreign objects.
- Look for an error code on the display — this narrows down the cause.
- Match your symptom to the likely codes and parts listed below.
- Replace the faulty part or call a technician if the fix requires specialized tools.
Likely error codes
FAQ
Why is my microwave not heating?
The cavity runs but food stays cold, or a thermal/humidity sensor code stops the cycle.
What error codes are related to this problem?
Common codes: GE F1, GE F4, Samsung C20, Samsung C21, LG E10.
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