KitchenAid · Dishwasher Serious
F3E1 — Thermistor / OWI Sensor Failure
The Optical Water Indicator (OWI) and thermistor sensor reports an out-of-range value to the control. The sensor measures wash water turbidity and temperature.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- kitchenaid.com ↗
How to fix it
- Power off at the breaker for 5 minutes.
- Pull the lower rack and remove the bottom filter assembly.
- Wipe the OWI sensor lens (small clear/blue lens in the sump) with vinegar and a soft cloth.
- Run a Cycle with a dishwasher cleaner or 2 cups of white vinegar.
- If F3E1 returns, pull the dishwasher and check the OWI sensor harness under the tub.
- Replace the OWI sensor if cleaning and reseating the harness don't clear the code.
- If a new sensor still throws F3E1, replace the main control board.
Why it happens
Typical signs: Dishes come out poorly cleaned · Cycle stops mid-wash · Dishes not heated/dried properly · F3E1 displayed or 3 flashes / 1 flash
- Dirty OWI sensor lens Hard-water film or food debris coats the optical lens in the sump.
- Failed OWI sensor Internal failure of the thermistor/optical sensor.
- Wiring harness fault Broken or unplugged harness between sensor and control board.
- Failed main control board Less common, board can't read a healthy sensor.
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.
More KitchenAid dishwasher 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: kitchenaid.com.