F3E3 Moderate Moderate DIY
Whirlpool Dishwasher F3E3 — OWI Calibration Failure / Bad Check Valve
Whirlpool Dishwasher · Error code F3E3
What F3E3 Means
The Optical Water Indicator failed its self-calibration, often because dirty wash water from the drain hose is backflowing into the tub through a failed drain hose check valve.
Symptoms
- F3E3 on display
- Visible dirty water in tub at start of cycle
- Poor cleaning results
- Cycle aborts after fill
Common Causes
1
Failed drain hose check valve / improper high loop
Drain water siphons back into the tub, fouling the OWI lens.
2
Dirty OWI lens
Hard water film or food debris coats the sensor optics.
3
Failed OWI sensor
Sensor electronics no longer respond to calibration.
How to Fix It
- Confirm the drain hose has a proper high loop secured to the underside of the countertop, or is connected above the disposer trap (min 20" above floor).
- Remove the filter and clean the OWI sensor lens in the sump with a soft cloth and white vinegar.
- Inspect the drain hose check valve at the sump outlet for debris and free movement; replace if damaged.
- Run a hot empty cycle with a dishwasher cleaner.
- If F3E3 returns, replace the OWI sensor assembly.
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.
More Whirlpool Dishwasher Codes
Verified against manufacturer documentation: applianceaid.com
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.