GE Appliances Microwave Error Code F1
Open thermal sensor — cavity temperature not detected
GE documents F1 as an open thermal sensor: during convection, combination, or roast cooking the control expects the cavity to reach temperature within 15 minutes, and an open sensor circuit means it never sees the rise. Microwave-only cooking may still work; convection functions stop.
What Does Error Code F1 Mean on a GE Appliances Microwave?
Open thermal sensor — cavity temperature not detected.
GE documents F1 as an open thermal sensor: during convection, combination, or roast cooking the control expects the cavity to reach temperature within 15 minutes, and an open sensor circuit means it never sees the rise. Microwave-only cooking may still work; convection functions stop.
What Causes Error Code F1?
Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:
- 1 Failed (open) cavity thermal sensor 60% of cases
- 2 Connector or harness fault 25% of cases
- 3 Control board input fault 15% of cases
How to Fix GE Appliances Microwave Error Code F1
- 1
Clear and retry
Press Cancel/Off to clear the code, then retry the convection function once — a one-off glitch clears.
- 2
Power-reset
Switch the breaker (or unplug the unit) for 60 seconds.
- 3
Book sensor replacement
The thermal sensor mounts on the cavity behind the outer case — microwave case removal carries shock risk even unplugged.
⚠️ Microwave capacitors store a lethal charge after unplugging. Do not open the case.
How to Reset Error Code F1
Press Cancel/Off to clear the display, or power-cycle at the breaker for 60 seconds. F1 returning during convection cooking confirms the sensor.
Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.
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Thanks for letting us know. If the steps above didn't work, see when to call a professional.
When to Call a Professional
All internal microwave repairs are professional territory — the high-voltage capacitor can hold a lethal charge long after unplugging. The fix itself (a sensor swap) is quick for a technician.
Related Error Codes
Same Code on Other Brands
Error code F1 appears on these other brands too. See every brand that shows F1 →
Find Replacement Parts
Use these links to find the exact replacement parts for your GE Appliances Microwave:
External links — ApplianceErrors.com is not affiliated with these retailers.
Frequently Asked Questions
What does error code F1 mean on a GE Appliances Microwave? +
How do I fix error code F1 on my GE Appliances Microwave? +
How do I clear or reset error code F1? +
Is error code F1 serious? +
Sources & References
- • GE Appliances Support — official manufacturer documentation
- • Our editorial & verification policy
Content verified against manufacturer service documentation. Last verified: June 12, 2026.