F21Serious
Whirlpool Oven/Range F21 Error Code
The oven temperature sensor reading is erratic or unstable.
Common causes
- Loose connection at sensor or board
- Faulty sensor
- Interference from heating elements
How to fix it
- Unplug and reseat sensor connector on control board.
- Check for damaged wire insulation.
- If problem persists, replace sensor.
⚠ When to call a pro: If sensor replacement fails, control board may be the issue.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.