Whirlpool · Microwave Critical
F9E0 — Improper / Miswired Home Power Supply
F9E0 indicates a problem with the home electrical supply to the microwave — most often miswired power (reversed line and neutral), or surge/electrical noise on the supply. It is not an oven/temperature fault. Have the outlet wiring and polarity checked.
- Keep using it?
- No — service first
- DIY difficulty
- Easy
- Verified against
- producthelp.whirlpool.com ↗
How to fix it
- Stop using the microwave until the supply is verified — wrong polarity can damage the control or be a shock hazard.
- Power down at the breaker for 1 minute and test once.
- Plug-in models: pull the unit and check the receptacle with a 3-light outlet tester. Fix the outlet before re-installing.
- Hardwire / built-in models: kill the breaker, open the junction box, and verify hot/neutral/ground per the install manual.
- If wiring is correct and F9E0 still appears, the appliance control board has failed and needs replacement.
Why it happens
Typical signs: F9E0 immediately after a new install · Code appears after a recent panel / breaker change · Microwave will not start any cycle
- Hot and neutral reversed at the receptacle Classic install error; verifies with a 3-light outlet tester.
- Open neutral or open ground Common on new circuits or after a breaker change.
- Hardwire connection bad on a built-in unit Verify against the install manual's wiring diagram.
- Brownout or low line voltage Less common; check voltage with a meter, should be 120V ±5%.
More Whirlpool 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: producthelp.whirlpool.com.