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 F0 F0 — Communication / no key entry fault F1 F1 — Open Thermal Sensor (Overheating) F10 F10 — Shorted Touch Screen F11 F11 — Shorted Touchpad / Keypad F2 F2 — Shorted Thermal Sensor

All GE codes → All microwave codes →

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.