KitchenAid dishwasher — Error Code F8 E4

What it means

The F8 E4 error code on a KitchenAid dishwasher indicates a critical overfill condition. Specifically, the electronic control board detects that the overfill float switch is in the 'open' or 'up' position during a cycle phase where it should be closed. This safety mechanism is designed to prevent catastrophic flooding in your kitchen. When the water level rises too high and lifts the float, it triggers the microswitch, prompting the main control board to immediately halt the wash cycle, display the F8 E4 code, and activate the drain pump to remove excess water. This fault is typically triggered by a mechanical binding of the float dome due to hard water scale, a failed microswitch under the tub, excessive sudsing from incorrect detergent that artificially lifts the float, or a weeping water inlet valve that allows water to seep into the tub when the machine is idle. In rare cases, a malfunctioning control board may falsely read an open circuit on the float switch line.

Likely Causes

1. 1
   Stuck Overfill Float

   Debris, food particles, or hard water mineral buildup can cause the plastic float dome inside the tub to bind and stick in the 'up' position.
2. 2
   Defective Float Switch

   The microswitch located directly underneath the float assembly can fail electrically or mechanically, sending a false overfill signal to the control board.
3. 3
   Leaking Water Inlet Valve

   If the water inlet valve fails to close completely, water will slowly seep into the tub while the machine is off, eventually tripping the float.
4. 4
   Excessive Sudsing

   Using regular dish soap or too much high-sudsing detergent creates foam that can artificially lift the float dome and trigger the F8 E4 code.
5. 5
   Drain Blockage

   If the drain pump or hose is clogged, standing water from a previous cycle fails to drain, triggering the overfill sensor on the next fill cycle.

How to clear / reset

To temporarily clear the F8 E4 code, press the Cancel/Drain button to force the dishwasher to pump out any standing water. Once the drain cycle completes, turn off power to the dishwasher at the main breaker for 3 to 5 minutes to reset the control board. Open the door and manually inspect the plastic float dome, usually located in the front right corner of the tub. Tap it gently to ensure it moves up and down freely, listening for a faint 'click' from the switch below. If the float is physically stuck or the underlying leak persists, the F8 E4 code will return immediately upon the next fill cycle until the root cause is repaired.

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