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.
Brand: KitchenAid
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.
Meaning
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
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.
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.
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.
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When to call a professional
If the simple checks didn’t solve it, if the fix involves electrical wiring, gas, or the refrigerant circuit, or if you have any doubt at all: stop there and hand the appliance to a qualified repair professional.