Frigidaire Microwave F5 Error Code: Causes & Fix

What is the Frigidaire Microwave F5 error?#

F5 flags the humidity sensor, the pickup that sniffs rising steam to decide when a sensor-cook is done. When it fouls with food splatter it throws F5 and the auto modes misjudge doneness — popcorn scorches, auto-reheat runs wrong. Cleaning the pickup is the first and usual cure. Helpfully, manual time-and-power cooking is unaffected, so the microwave still works as a stopgap while you clean the sensor.

F5 on a Frigidaire Microwave: likely causes and repair cost#

On a Frigidaire Microwave, the F5 code signals: humidity sensor error.

Typical professional repair: $75–$175 · Difficulty: moderate · usually a technician job

Symptoms that often accompany F5: Sensor auto-cook modes finish wrong; Popcorn comes out scorched or still kernelled; Auto-reheat runs for the wrong length of time

Technician diagnostic sequence for F5:

1. This sensor sniffs the rising steam to decide when a sensor-cook is done, so a fouled one throws F5 and its auto modes misjudge doneness — cleaning the pickup is the first and usual cure
2. Find the small vented sensor grille inside the cavity, up top or on a sidewall, and wipe the greasy film off it with a damp cloth so it can actually smell the steam again
3. Run the empty oven for a minute to bake off any stubborn residue clinging to the element after the wipe-down
4. If sensor-cooks still misfire, unplug the sensor connector and check for a loose seat or corroded pins before writing off the element itself

Parts a technician may check or replace: humidity sensor

Field note: Because this pickup only reads steam to time the auto modes, a splatter-clogged grille is almost always the whole problem — a wipe and a one-minute empty run clears most F5 faults. Note that manual time-and-power cooking is unaffected, which is a handy stopgap while you clean or source the part.

How to troubleshoot the F5 error yourself#

This is mostly a cleaning job you can do yourself. Find the small vented sensor grille inside the cavity — usually up top or on a sidewall — and wipe the greasy film off it with a damp cloth so it can actually smell the steam again. Run the empty oven for a minute afterward to bake off any stubborn residue clinging to the pickup. If sensor-cooks still misfire after a good clean, the next step is a technician one: unplugging the sensor connector to check for a loose seat or corroded pins before writing off the sensing element itself. Because getting deeper means removing panels on a unit that stores high voltage in its capacitor, stop at the cleaning and leave the internal connector and sensor replacement to a technician. In the meantime, use manual power-and-time settings, which do not rely on the sensor.

Is the Frigidaire Microwave F5 error worth fixing?#

F5 is one of the least worrying microwave faults. A splatter-clogged grille is almost always the whole problem, so most cases cost nothing but a wipe-down and a one-minute empty run. If the humidity sensor has genuinely failed and needs replacing, a professional repair runs $75 to $175 — modest, though on an inexpensive over-the-range microwave that figure can approach a meaningful share of a replacement. For a higher-end or built-in unit, the repair is clearly worth it; for a low-cost microwave where only the auto modes are affected, many owners simply keep using manual cooking.