What should I check first for KitchenAid dishwasher error F6E4?

Check the overfill float for anything stuck under it, and that it moves freely.

F6E4High

KitchenAid dishwasher error F6E4

KitchenAid dishwasher error F6E4 means the overfill float switch is open — usually something stuck under the float rather than a failed part.

Also shows as 6-4, F6 E4

Symptom
F6E4
Free checks
2 checks
Most likely cause
The water float switch is open

The 2 free checks

Start at the top. Unplug the machine first.

01
Check the overfill float for anything stuck under it, and that it moves freely.
02
Check whether the inlet valve shuts the water supply off when the dishwasher is off — if water keeps coming in, the valve is not closing.

What causes it

Listed most likely first.

Cause	How often	DIY
The water float switch is open	Most common	Yes
An item is stuck under the overfill float	Most common	Yes
The inlet valve is not shutting the water off when the machine is idle	Common	Call a pro

If none of that fixed it

If the code comes back after the reset, KitchenAid says to schedule service rather than to keep going.

Before you check anything

Disconnect the power first. Unplug the machine at the socket, or switch off its circuit at the consumer unit if it is hard-wired. Do this before opening any panel, reaching into a pump filter, or moving the appliance.
Turn off the water before disconnecting a hose, and have a towel and a shallow tray ready — a drain hose holds water even when the drum looks empty.
Gas, mains wiring and sealed refrigeration are for a qualified professional — in many countries that is a legal requirement, not advice. If you smell gas, do not touch any switch: leave, and call your gas emergency number from outside.
Stop if you smell burning, see scorched wiring, or find water near an electrical connection. None of those is a code to look up.

The checks on this page are the manufacturer’s own, rewritten and sourced, and they are reference information rather than a repair instruction for your particular machine. Model, age and installation all change what is safe to do. You are the one standing in front of it — if a step looks wrong for the machine you have, trust that and call a technician.