Maytag · Dishwasher Serious
F3E1 — Thermistor / OWI Sensor Failure
The temperature/optical water indicator sensor in the sump is reading out of range. The control can't verify water temperature or soil level, so it stops or short-cycles.
- Keep using it?
- Limited use only
- DIY difficulty
- Moderate
- Verified against
- maytag.com ↗
How to fix it
- Run an empty cycle with a cup of citric acid or dishwasher cleaner to descale the sump and OWI lens.
- If the fault returns, pull the lower rack and bottom spray arm and remove the sump cover to access the OWI sensor.
- Inspect the OWI lens for cloudiness; wipe it clean with a soft cloth — do not scratch it.
- Unplug and reseat the sensor harness.
- If symptoms persist, replace the OWI sensor (an inexpensive snap-in part).
- Re-run a Normal cycle and confirm the water heats fully.
Why it happens
Typical signs: Cycle ends early · Dishes come out cold or dirty · Long cycle times · Heat dry doesn't work
- Failed OWI/thermistor sensor The dual-purpose optical water indicator in the sump has drifted or shorted.
- Hard-water film on the OWI lens Scale coats the optic and mimics a dirty/failed reading.
- Wire harness disconnected from the sensor Connector worked loose during service or shipping.
- Control board fault reading the sensor Less common — ACU input circuit failure.
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.
- Maytag OWI optical water indicator sensor Common replacementAmazon →
More Maytag 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: maytag.com.