Microwave Not Heating
The cavity runs but food stays cold, or a thermal/humidity sensor code stops the cycle. Start with these microwave-specific checks before replacing parts: Unplug the appliance before inspecting. Likely error codes for this symptom include GE F1, GE F4, Samsung C20, Samsung C21, LG E10.
First things to check
- Unplug the appliance before inspecting.
- Check for obvious clogs, loose connections, or foreign objects.
- Note any error code on the display — it narrows the cause faster than guessing parts.
- Match your symptom to the error codes and compatible parts listed below.
- Replace the faulty part or call a technician if the fix requires sealed systems or live voltage work.
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 should I check first?
Unplug the appliance before inspecting. Check for obvious clogs, loose connections, or foreign objects. Note any error code on the display — it narrows the cause faster than guessing parts.
What error codes are related to this problem?
GE F1, GE F4, Samsung C20, Samsung C21, LG E10
When should I call a technician?
Call a pro if you smell burning or gas, see sparking, or the same code returns after replacing the suspected part.
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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