GE Microwave F5 Error: Shorted humidity sensor
This guide covers GE microwave F5 error in detail to help you diagnose and resolve the issue. What Does GE Microwave Error Code F5 Mean? Error code F5 means the control board detected a short or out-of-range signal from the humidity sensor used by GE’s sensor-cook technology. The humidity sensor monitors steam levels inside the […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. Manual timed cooking is generally safe when F5 is the only active fault. Avoid all Sensor Cook and Auto Reheat functions until the humidity sensor is repaired. Do not use if F5 appears at startup and locks out all functions.
Can I reset the code?
Yes. Unplugging for 60 seconds clears the F5 display. If the sensor fault is caused by a grease deposit, thorough cleaning before the reset may permanently resolve the issue. A hardware sensor failure causes F5 to return on the next sensor-mode activation.
When to stop immediately?
Stop if you notice: F5 appears at power-up and locks out all cook functions including manual modes, You smell burning or see arcing near the sensor port inside the cavity.
Symptoms You May Notice
Sensor Cook and Auto Reheat functions fail to start
Pressing Sensor Cook or any auto-humidity mode causes an immediate fault — the microwave beeps and returns to standby without beginning a cycle, because it cannot read the humidity sensor.
F5 displayed after selecting a sensor-based function
The fault code appears specifically when a humidity-dependent cooking mode is selected. On some models it also appears at startup if the sensor short is severe.
Steam escapes abnormally or condensation on door
If the humidity sensor is shorted rather than open, the control board may believe steam levels are always at maximum, causing erratic early shut-offs or preventing the oven from reaching programmed cook times.
Manual timed cooking still works on most models
Unlike F1/F2 which lock out all heating, F5 on many GE models only disables sensor-dependent modes. Timed manual cooking at a set power level may still function normally.
Possible Causes
Shorted or failed humidity sensor
The humidity sensor element inside the cavity has failed with an internal short or is coated with heavy grease that creates a false conductive path, sending out-of-range readings to the board.
Requires ProfessionalGrease or food deposits on the sensor element
Heavy cooking residue on the sensor surface alters its electrical resistance and causes the control board to read a shorted state, even if the sensor element itself is intact.
DIY PossibleLoose sensor wiring connection
The connector at the humidity sensor or control board has worked loose, causing intermittent circuit continuity that the board interprets as a shorted sensor.
Requires ProfessionalSafe Checks You Can Do
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1
Clean the cavity and sensor area
Unplug the microwave. Wipe the entire cavity interior — walls, ceiling, and floor — with a mild dish-soap solution on a damp cloth. Pay special attention to the area near the sensor (a small vent or port, usually near the top-right interior of the cavity). Rinse with a clean damp cloth and allow to air-dry for 30 minutes before restoring power.
Heavy grease buildup on the sensor is particularly common after cooking fatty meats without a cover. Use a microwave-safe cover or splatter guard to reduce residue accumulation.
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2
Reset and test manual cook mode
After cleaning and allowing the cavity to dry, plug the microwave back in and press Clear. Test a 1-minute manual cook at 100% power (not a Sensor Cook mode). If this works, the sensor fault is only affecting auto modes. Then attempt a Sensor Cook cycle to confirm whether F5 returns.
If manual cook works but Sensor Cook faults, the sensor itself (not the magnetron or control board power circuit) is the isolated problem.
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3
Avoid sensor modes until repaired
If F5 returns on sensor modes after cleaning, use only manual timed cooking until the sensor is serviced. Set cook time and power level manually — all food safety and cooking results remain the same; only the convenience of auto-sensing is lost.
Most GE microwaves operate all manual timed and power-level functions normally even with F5 active — sensor mode is an enhancement, not a core heating function.
When to Call a Professional
Contact a qualified technician if:
- F5 returns after thorough cleaning and reset — sensor element failure confirmed
- All sensor-based modes fault immediately on every attempt after cleaning
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