KitchenAid Dishwasher E4 Error — Float Switch Fix

What it means

KitchenAid dishwasher E4 means the float switch under the tub picked up water where it shouldn't be — almost always in the drip pan beneath the unit.
KitchenAid's support page lists three checks: confirm the water supply connections are tight, verify the float switch itself is connected, and empty any water sitting in the drip pan before clearing the code.

Affected Models

KitchenAid KDPM, KDTM, KDTE, KDFE built-in dishwashers
KitchenAid KDPE, KDPE804K, KDPE234G series
KitchenAid PrintShield, Architect II, and panel-ready models
KitchenAid KUDS legacy series (older models)
Same codes appear on Whirlpool, Maytag, and JennAir dishwashers (shared platform)

Common Causes

Water sitting in the drip pan under the tub
Loose water supply connection at the inlet valve
Rubber washer at the supply connection misseated
Float switch in the drip pan disconnected from its housing
Small intermittent leak from the door gasket or pump seal

How to Fix It

Tip the dishwasher and check the drip pan.

KitchenAid built-ins have a shallow plastic drip pan beneath the tub.
The float switch sits inside it.
If any water has collected, it MUST be removed before E4 will clear.
Carefully tip the front of the dishwasher up an inch or two and sponge out the pan.
Tighten the supply connection.

Under the sink, find the braided water supply line going to the dishwasher.
KitchenAid's exact wording: 'Hand-tighten until the coupling is tight. Using pliers, check the tightness of the coupling.'
A weeping connection drips slowly into the drip pan and trips E4 hours later.
Reseat the rubber washer.

Shut off the supply, disconnect the line, and inspect the small rubber washer inside the coupling.
If it's flat, cracked, or sitting crooked, replace it (50 cents at any hardware store).
Reconnect — finger tight plus a quarter turn with pliers.
Verify the float switch.

With the drip pan empty, check that the float (small plastic disc on a wire) sits flat in its housing and the wire connector is fully clipped.
A disconnected float can read as 'water present' and trigger E4 even with a dry pan.
Clear the code.

KitchenAid: 'Press the Cancel key once to silence the alarm tone. Press the Cancel key again to clear the code.'
Then run a short cycle to confirm E4 doesn't return.

When to Call a Professional

If you confirm the drip pan is dry, all supply connections are hand-tight then pliers-tight, and the float switch sits properly in its housing — and E4 still appears — schedule service.
A persistent E4 with a dry pan usually means a failing float switch or a leak you haven't located.

Frequently Asked Questions

How is E4 different from F8E4?

Both involve the float switch, but the codes appear on different model generations.
E4 is the older single-letter code on legacy KitchenAid panels.
F8E4 is the modern two-part code used on KitchenAid built-ins from about 2014 onward — and it's also the code professionally installed units default to.
The underlying float-switch fault and the fix steps are the same on both.