The Dishwasher Drained on Cancel but Still Set F9E1
The timing mattered: the error appeared near the end of a long cycle, while short diagnostic cycles repeatedly passed.
Why a working drain pump did not close the diagnosis
- The complaint covered Whirlpool and KitchenAid dishwashers.
- Most of the wash cycle reportedly ran normally.
- Water remained when F9E1 appeared near the end.
- Pressing Cancel produced a strong drain.
- Repeated service cycles did not reproduce the fault.
A similar symptom can have a different cause on another machine. A pump that runs once does not prove the complete drain path remains open throughout a full cycle.
Intermittent restrictions can hide during an air test
One technician described clear glass that was difficult to see and did not block air when the hose was blown through. Water flow could turn the piece and intermittently restrict the path. Another described a coin downstream of the pump that changed position under flow.
These were examples from comparable repairs, not a confirmed cause in the original case. The thread also raised the drain pump, circulation filter or pump, wiring and control as unconfirmed possibilities.
A better way to reproduce the late-cycle fault
- Observe actual drain volume and timing during the full cycle that produces F9E1.
- Inspect the complete hose path and check valve instead of relying only on air flow.
- Check for debris that can rotate or shift under water pressure.
- Separate drain-pump performance from circulation-pump performance.
- Treat the control as a later hypothesis unless the hydraulic path and load behavior are verified.