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.
First things to check
- 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.
Related 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.
When to call a professional
Call a technician if you smell gas, see sparking, or basic checks don't resolve the issue.
Find a repair professional →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
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