FixByModel
F3E2

Maytag F3E2: Thermistor or OWI sensor fault

The temperature/turbidity sensor (thermistor or Optical Water Indicator) is reading out of range, so the control cannot judge water temperature or soil level. Cycles may run long or fail to heat properly.

May need a technician

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Hard-water scale or food film coating the OWI sensor lens
  2. Faulty thermistor/OWI sensor
  3. Damaged wiring between the sensor and the control board
  4. Control board fault
Before you start — unplug the appliance and turn off the water supply. You'll be working near water and electrical parts, and drained water can be hot. If a step involves the pump, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Power resetDisconnect power for 30 seconds, then restore it.
2Clean the sensorWipe the OWI sensor lens in the tub with white vinegar on a soft cloth to remove scale or film.
3Run a cycleCheck whether the code clears after cleaning the sensor.
4Call for serviceIf it returns, a technician should test or replace the thermistor/OWI sensor and check its wiring.

Still showing F3E2?

If you’ve worked through every step and F3E2 keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Maytag dishwashers. Maytag F#E# platform dishwashers (MDB-series with OWI sensor), roughly 2015-present

FAQ

What does Maytag F3E2 mean?

Thermistor or OWI sensor fault. The temperature/turbidity sensor (thermistor or Optical Water Indicator) is reading out of range, so the control cannot judge water temperature or soil level. Cycles may run long or fail to heat properly.

What causes Maytag F3E2?

The most likely cause is hard-water scale or food film coating the owi sensor lens. Other causes include Faulty thermistor/OWI sensor; Damaged wiring between the sensor and the control board; Control board fault.

Can I fix Maytag F3E2 myself?

Some checks are DIY, but this code often points to an internal component, so it may need a qualified technician.