GE Appliances Microwave Error Code F4
Open humidity sensor — sensor cooking disabled
GE's sensor-cook features (Popcorn, Reheat, Sensor Cook) read steam through a humidity sensor. F4 means that sensor circuit reads open, so sensor-cook modes fail or abort — manual time cooking keeps working normally. The sensor or its connector has failed.
What Does Error Code F4 Mean on a GE Appliances Microwave?
Open humidity sensor — sensor cooking disabled.
GE's sensor-cook features (Popcorn, Reheat, Sensor Cook) read steam through a humidity sensor. F4 means that sensor circuit reads open, so sensor-cook modes fail or abort — manual time cooking keeps working normally. The sensor or its connector has failed.
What Causes Error Code F4?
Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:
- 1 Failed (open) humidity 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 F4
- 1
Use manual modes meanwhile
Time-based cooking is unaffected — the fault only blocks sensor-driven modes.
- 2
Power-reset
Breaker off for 60 seconds and retry a sensor-cook mode.
- 3
Book sensor replacement
The humidity sensor mounts in the vent path inside the case.
⚠️ Internal access is technician-only — HV capacitor hazard.
How to Reset Error Code F4
Press Cancel/Off to clear the code. The microwave remains fully usable in manual modes while you decide on the repair.
Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.
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When to Call a Professional
Because manual cooking still works, this is the rare microwave fault you can reasonably live with — repair it opportunistically or when convenience matters.
Related Error Codes
Same Code on Other Brands
Error code F4 appears on these other brands too. See every brand that shows F4 →
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.
More GE Appliances Microwave Error Codes
Frequently Asked Questions
What does error code F4 mean on a GE Appliances Microwave? +
How do I fix error code F4 on my GE Appliances Microwave? +
How do I clear or reset error code F4? +
Is error code F4 serious? +
Sources & References
- • GE Appliances Support — official manufacturer documentation
- • Our editorial & verification policy
Content verified against manufacturer service documentation. Last verified: June 12, 2026.