GE · Microwave Minor

F4 — Open Humidity Sensor

F4 means the humidity (sensor-cook) sensor read open. Sensor-cook functions are affected.

Keep using it?
Yes — fix when convenient
DIY difficulty
Moderate
Verified against
products.geappliances.com ↗

How to fix it

  1. Unplug for a minute to reset.
  2. If F4 returns, check the humidity sensor connector and replace the sensor if open.

Why it happens

Typical signs: Sensor-cook fails · F4 on the display

  • Disconnected or failed humidity sensor The genius/humidity sensor is open.
  • Sensor wiring fault A broken connection to the sensor.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • GE Microwave Humidity Sensor Common replacement
    Amazon →

More GE microwave codes

DOOR DOOR — Door not fully closed / open too long F1 F1 — Open Thermal Sensor (Overheating) F10 F10 — Shorted Touch Screen F11 F11 — Shorted Touchpad / Keypad F2 F2 — Shorted Thermal Sensor F3 -E0 F3 — Shorted Touch Panel

All GE codes → All microwave codes →

Frequently asked questions

What does the F4 code mean on a GE microwave?

F4 means the humidity (sensor-cook) sensor read open. Sensor-cook functions are affected.

What causes the F4 code on a GE microwave?

Disconnected or failed humidity sensor: The genius/humidity sensor is open. Sensor wiring fault: A broken connection to the sensor.

Is it safe to keep using a GE microwave with a F4 error?

Yes — fix when convenient. This is rated a minor-severity fault.

How do I fix F4 on a GE microwave?

Unplug for a minute to reset. If F4 returns, check the humidity sensor connector and replace the sensor if open.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: products.geappliances.com.