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KitchenAid Dishwasher Error Code F8E4 (Water Under the Unit)

F8E4 means the float switch under the tub detected water where it shouldn’t be, usually a loose fitting from a recent install rather than a worn part.

Risk: Moderate

Meaning

F8E4 comes from the emergency float switch KitchenAid places in the drip tray beneath the main tub, not inside it. When that switch senses moisture, the dishwasher stops and won’t run again until the water is gone and the cause is fixed. KitchenAid’s own troubleshooting leans heavily toward installation issues on newer units rather than a failing part, which matches what most owners find when they check.

The information provided here is a diagnostic aid and does not replace the intervention of a qualified professional.

Possible causes

No cause is certain until it has been checked on the appliance.

Very likely Float switch connector not fully seated (very common right after installation)
Likely Water line fitting not tight enough, or its rubber washer missing or misaligned
Likely Fill hose routed incorrectly and resting where it can drip into the base
Rare Failing float switch itself

Tools needed

Adjustable pliers
Flashlight
Towels

First checks

Press Cancel twice to clear the code, then check for standing water in the base before restarting anything.
Pull the dishwasher out and confirm the float switch connector is pushed in until its locking tab is visible over the back of the plug.
Check the water line fitting: the rubber washer should be seated, and the coupling hand-tight plus a quarter to half turn with pliers.
Confirm the fill hose runs out the rear left side of the unit rather than draped across the bottom of the tub.

Step-by-step diagnosis

Press Cancel twice to clear the code, then look for standing water in the drip tray before restarting anything.
Pull the dishwasher out. Find the float switch connector under the tub and push it in until its locking tab shows over the back of the plug. Right after an installation this is the most likely single cause.
Check the water line fitting at the inlet valve: the rubber washer seated flat, the coupling hand-tight plus a quarter to half turn with pliers.
Trace the fill hose. It should exit the rear left of the unit, not lie draped across the bottom of the tub where condensation runs off it into the tray.
Dry the tray fully. The switch stays tripped as long as it is sitting in water, however good the plumbing now is.
Slide the unit back in slowly and watch that neither hose gets pinched against the cabinet as it goes.

What not to do

Sliding the unit back into place without rechecking the fittings first. On a newly installed dishwasher, F8E4 is almost always a connection issue, not a defective part.
Running a full cycle to test the fix. Run the empty rinse cycle first so a repeat leak doesn't soak dishes or the cabinet floor.

When to stop

The tray refills with the connector seated and the fitting tight.
The code stays on with a dry tray, which points at the float switch itself.

An error code varies by brand

The same code can have a different meaning depending on the brand and model. Always check your appliance's manual before acting.

Related guides

When to call a professional

If the simple checks turned up nothing, if the repair involves electricity, gas, or the sealed refrigerant system, or if you have any doubt at all: stop there and hand the appliance over to a qualified technician.