Frigidaire Microwave F-30 Error — Sensor Open

What it means

F-30 on a Frigidaire microwave means the humidity sensor circuit is open — wiring is disconnected or the sensor has failed completely.
Sensor cooking is disabled.
Manual cooking still works.
Permanent fix requires sensor replacement.

Affected Models

Frigidaire FFMV1645T
Frigidaire Gallery FGMV176N
Frigidaire Professional FPMO227N
Frigidaire FFCE2278L
Frigidaire FGMO226N

Common Causes

Sensor wiring connector worked loose due to vibration
Pinched or broken sensor cable inside the microwave housing
Failed humidity sensor (open-circuit failure mode)
Damage from a previous repair or installation

How to Fix It

Confirm manual cooking still works.

F-30 only disables sensor cook.
Set a 30-second test using time-cook on a cup of water.
If it heats normally, the microwave remains usable for manual cooking while you arrange repair.
Unplug for 5 minutes and retry.

A power cycle occasionally clears a transient sensor read.
Unplug at the wall, wait 5 minutes, and plug back in.
If F-30 clears, the cause was a brief glitch.
Note recent events.

F-30 often appears after the microwave has been moved, jolted, or had its cabinet vent cleaned.
If the unit was disturbed recently, a wiring connector may have worked loose internally.
Book service for sensor or wiring inspection.

F-30 is not safely user-serviceable — accessing the wiring requires opening the case, which exposes the high-voltage capacitor (lethal even unplugged).
A technician will check the harness connector before replacing the sensor.

Frequently Asked Questions

What is the difference between F-11 and F-30?

F-11 means the sensor circuit is shorted (often by grease or moisture).
F-30 means the sensor circuit is open (wiring disconnected or sensor failed).
F-11 is often cleaned away; F-30 typically needs replacement.

Will my Frigidaire microwave still cook if F-30 is showing?

Yes — manual time-cook works normally with F-30.
Only sensor-based auto-cook (Popcorn, Reheat, Auto Defrost on weight) is disabled.
The error remains on the display until the underlying issue is repaired.