What 3-3 / F3E3 (Whirlpool-built HE) Means
3-3 and F3E3 on Whirlpool-built Kenmore HE dishwashers carry a genuinely useful piece of diagnosis: either the optical sensor failed to calibrate, or the check valve in the drain hose has failed and dirty water is flowing back into the tub.
Common Causes of 3-3 / F3E3 (Whirlpool-built HE)
- A failed check valve in the section of drain hose at the pump
- A drain hose looped too low, letting sink water siphon back
- An optical sensor unable to calibrate against dirty water
🔧 One Safe Check You Can Try
Look at whether the tub has grey water in it before a cycle starts; water arriving between cycles is the signature of a failed check valve rather than a sensor problem.
⚠ Why You Shouldn't Go Further Than That
- Isolate the machine at the breaker and shut the water off before the base panel is disturbed.
- The check valve is part of a specific section of drain hose, not a separate item, which changes what gets ordered.
- A sensor replaced while dirty water keeps flowing back will not calibrate any better than the old one.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.