The short answer
F10E4 is published with a potential cause of a diverter valve error. The diverter is the valve that decides which spray arm gets the pump’s water, so the symptom you notice is uneven washing — one rack cleaned properly and the other barely touched. Cleaning the filter and sump is the first and often the only thing needed.
Whirlpool dishwasher code as the manufacturer publishes it
Reference| Code | Meaning |
|---|---|
| F10E4 | Potential Cause: Diverter Valve Error |
What you observe alongside the code
- One rack washed properly and the other barely touched — Water going to one spray arm and staying there.
- A cycle that sounds the same throughout — The diverter not stepping between positions.
- Poor washing that is consistent rather than random — Predictable by rack position.
- Grit left on the upper rack only — A diverter stuck away from the upper feed.
What triggers it, most likely first
- Debris jamming the diverter — First: it is a moving valve in the dirtiest water in the machine, and a fragment of glass or a fruit stone is enough to stop it stepping.
- A failing diverter motor — Second: a small motor that steps the valve, and it wears out before most of the machine does.
- A position sensor or its wiring — Third: the valve moves and the control cannot confirm it, which reports identically.
- A blocked spray arm making the fault look worse — Fourth: not a cause of the code, but it masks whether the diverter is working.
Check in this order, and why
- Note which rack washes badly, and whether it is always the same one — A consistent pattern by rack is the diverter’s signature.
- Notice which rack washes badly and whether it is always the same one — A consistent pattern is the diverter’s signature.
- Clean the filter and sump thoroughly — Removes the debris that jams the valve, and it is free.
- Check both spray arms turn freely and their holes are clear — Rules out the imitator before the valve is blamed.
Clearing the code, then the owner-safe checks
- Clean the filter and clear the sump by hand — Gloves and a light: glass and stones are what jam a diverter.
Tools: gloves, flashlightAbout 20 min
- Remove and rinse both spray arms, clearing every hole — Rules out the cheap imitator of this fault.
Tools: toothpickAbout 20 min
- Run a short cycle and listen for the wash note changing — A diverter that is stepping changes the sound of the wash.
About 30 min
- STOP HERE if the wash note never changes — That is the diverter, its motor or its sensor, in the sump assembly.
Before you open anything
Safety
Unplug the dishwasher or switch off its breaker before removing the toe panel or the inner door panel. A capacitor can hold a charge after the power is off, and the supply is not switched at the door. Bail any standing water out of the tub before working underneath, and go into the sump with gloves and a light — broken glass collects there. The sump is where glass collects, so go in with gloves and a light rather than bare fingers.
When this code is a service call
Call when the filter and sump are clean, both spray arms are clear, and one rack still washes badly: the diverter, its motor and its position sensor all sit in the sump assembly under the tub. The machine remains usable in the meantime if you load the rack that still washes properly.
Neighbouring Whirlpool dishwasher codes
Which model lines this reading applies to
This reading of F10E4 applies to Whirlpool-built built-in dishwashers of the generation whose service documentation publishes this code, which is where the manufacturer documents it. A machine with a mechanical timer and no diagnostic display does not produce it, and the same characters can be published against a different fault on a KitchenAid or Maytag-badged unit from the same platform. Diverter designs differ across this platform between stepper-driven and solenoid types, which changes both the failure mode and the part. Where a model-specific page exists for your unit it is linked above and is the more specific answer: component resistances, connector positions and part numbers differ by family and belong there.
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
