Whirlpool · Dishwasher Moderate

F3E1 — Thermistor/OWI Sensor Open

The control sees an open circuit on the thermistor or Optical Water Indicator (OWI/turbidity sensor) in the sump. The dishwasher cannot verify water temperature or clarity.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
applianceaid.com ↗

How to fix it

  1. Remove the lower dish rack and the chopper/filter assembly to expose the sump.
  2. Pull the toe-kick and trace the wiring from the control board to the thermistor/OWI in the sump.
  3. Unplug and reseat both ends of the harness. Inspect for chafe spots, especially where the harness crosses the frame.
  4. Run service diagnostic from the tech sheet. If F3E1 persists with the harness verified good, replace the OWI/thermistor assembly.
  5. Reassemble and run a Normal cycle to verify.

Why it happens

Typical signs: F3E1 on display · Cycle stalls or stops mid-wash · Poor cleaning performance · Dishwasher may skip heating

  • Disconnected or damaged thermistor/OWI wire harness Most common cause — connector at the sump shakes loose or a wire chafes.
  • Failed OWI/thermistor sensor The combined sensor in the sump has gone open-circuit.

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.

  • Whirlpool dishwasher OWI sensor / thermistor Common replacement
    Amazon →

More Whirlpool dishwasher codes

E1 E1 — Fill / Water Supply Problem (legacy code) E4 E4 — Overfill / Water in Drip Tray F1E1 F1E1 — Control Module Fault F1E2 F1E2 — Incompatible or Failed Control Board F2 F2 — Water leak detected F3E3 F3E3 — OWI Calibration Failure / Bad Check Valve

All Whirlpool codes → All 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: applianceaid.com.