Whirlpool · Microwave Moderate

F8E5 — Exhaust Air Temperature Sensor Fault

The control cannot read the exhaust air temperature sensor (or door-position sensor on some firmware variants). Common after a hot, greasy cook cycle that loads up the exhaust path.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
producthelp.whirlpool.com ↗

How to fix it

  1. Power down at the breaker for 1 minute and retest.
  2. Pull the charcoal and grease filters; degrease the vent path. Run a 5-minute fan-only cycle and recheck.
  3. Unplug the unit and access the top of the cavity per the tech sheet.
  4. Reseat the exhaust air temperature sensor connector. If the code remains, replace the sensor.
  5. If the sensor and wiring check out, inspect door latch hooks and interlock switches for the door-sensor variant of this code.

Why it happens

Typical signs: F8E5 on the display · Microwave aborts mid-cycle · Vent fan runs but heating is interrupted · Door reads closed but unit still throws the code

  • Failed exhaust air temperature sensor Most common — sensors fatigue from heat and grease.
  • Dirty or blocked exhaust path Heavy grease load skews the reading; clean filters and vents.
  • Loose or damaged sensor wiring Check both ends of the harness for backed-out pins.
  • Door position sensor disagreement (some models) On firmware where F8E5 covers door sensing, inspect latch hooks and switches.

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.

  • Whirlpool microwave exhaust air thermistor Common replacement
    Amazon →

More Whirlpool microwave codes

AccuPop Fail AccuPop Fail — Popcorn Sensor Fault Demo Demo Mode — Not Heating Door Door / Open Door Closed — Safety Reminder F1E4 F1E4 — Appliance Manager or Power Relay Fault F1E5 F1E5 — Inverter Internal Fault F2 F2 — Keypad / Control Fault

All Whirlpool codes → All microwave codes →

Frequently asked questions

What does the F8E5 code mean on a Whirlpool microwave?

The control cannot read the exhaust air temperature sensor (or door-position sensor on some firmware variants). Common after a hot, greasy cook cycle that loads up the exhaust path.

What causes the F8E5 code on a Whirlpool microwave?

Failed exhaust air temperature sensor: Most common — sensors fatigue from heat and grease. Dirty or blocked exhaust path: Heavy grease load skews the reading; clean filters and vents. Loose or damaged sensor wiring: Check both ends of the harness for backed-out pins.

Is it safe to keep using a Whirlpool microwave with a F8E5 error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix F8E5 on a Whirlpool microwave?

Power down at the breaker for 1 minute and retest. Pull the charcoal and grease filters; degrease the vent path. Run a 5-minute fan-only cycle and recheck. Unplug the unit and access the top of the cavity per the tech sheet.

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: producthelp.whirlpool.com.