Whirlpool · Dishwasher
Whirlpool Dishwasher F3E2 Error Code
OWI or thermistor temperature circuit shorted
What this error means
F3E2 means the Optical Water Indicator or tub thermistor temperature circuit reads shorted. The control cannot measure wash water temperature or turbidity for cycle optimization.
How F3E2 is detected
When F3E2 appears on a Whirlpool dishwasher, the control board has confirmed that water did not leave the machine within the programmed drain window. On Whirlpool WDT750SAKZ, Whirlpool WDT730PAHZ, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most F3E2 calls are resolved without parts: disconnect power and locate the owi sensor at the sump per your tech sheet. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If F3E2 returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Moisture in the OWI sensor connector under the tub
- Shorted thermistor from mineral scale on the probe
- Pinched harness wire at the tub base shorting to ground
- Failed OWI sensor sending a constant low-resistance reading
Step-by-step fixes
- 1Disconnect power and locate the OWI sensor at the sump per your tech sheet
- 2Dry the connector and inspect for green corrosion on the pins
- 3Measure thermistor resistance—it should not read near zero ohms at room temperature
- 4Cycle breaker off one minute and run a normal wash to see if F3E2 clears after drying the plug
When to call a technician
Replace the OWI/thermistor assembly if resistance is out of spec after connector cleaning.
Affected models
- Whirlpool WDT750SAKZ
- Whirlpool WDT730PAHZ
- Whirlpool WDF540PADM
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use dishwashers to prevent F3E2 from lint and food debris buildup.
- Record when F3E2 appears in the cycle and whether it clears after a 60-second power reset on your Whirlpool dishwasher—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F3E2; Whirlpool uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F3E2; reversed plugs on pumps and valves cause immediate repeat faults.