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

How to fix it

  1. Run an empty cycle with a cup of citric acid or dishwasher cleaner to descale the sump and OWI lens.
  2. If the fault returns, pull the lower rack and bottom spray arm and remove the sump cover to access the OWI sensor.
  3. Inspect the OWI lens for cloudiness; wipe it clean with a soft cloth — do not scratch it.
  4. Unplug and reseat the sensor harness.
  5. If symptoms persist, replace the OWI sensor (an inexpensive snap-in part).
  6. 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 replacement
    Amazon →

More Maytag dishwasher codes

F1E1 F1E1 — Control Board Failure F2E1 F2E1 — Stuck Key on Control Panel F2E2 F2E2 — User Interface Communication Error F3E2 F3E2 — Thermistor Open / Out of Range F4E1 F4E1 — Heater Circuit Fault F5E1 F5E1 — Door Switch Failure

All Maytag codes → All dishwasher codes →

Frequently asked questions

What does the F3E1 code mean on a Maytag dishwasher?

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.

What causes the F3E1 code on a Maytag dishwasher?

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.

Is it safe to keep using a Maytag dishwasher with a F3E1 error?

Limited use only. This is rated a serious-severity fault.

How do I fix F3E1 on a Maytag dishwasher?

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.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.