KitchenAid dishwasher — Error Code F8 E4

What it means

The F8 E4 fault on a KitchenAid dishwasher signifies an overfill alert. Essentially, the control board senses that the overfill float switch remains in the 'open' or 'up' state when it should be closed. This is a critical safety feature built to stop water from overflowing onto your kitchen floor. When the water level gets too high, the float rises, triggering a microswitch that forces the control board to stop the cycle, flash the F8 E4 code, and start the drain pump to clear the excess. Common culprits include mineral buildup from hard water in places like Spokane, a damaged microswitch beneath the tub, excessive soap suds that lift the float, or a failing water inlet valve that lets water creep in while the machine is dormant. Occasionally, a faulty control board might incorrectly report an open circuit at the float switch.

Likely Causes

1. 1
   Obstructed Overfill Float

   Grit, food debris, or calcium deposits from hard water can cause the internal plastic float dome to become stuck in the 'up' position.
2. 2
   Faulty Float Switch

   The microswitch located under the float assembly may suffer from electrical or mechanical failure, leading to a false overfill reading.
3. 3
   Leaking Water Inlet Valve

   Should the inlet valve fail to shut completely, water will slowly fill the tub while the appliance is off, eventually triggering the float sensor.
4. 4
   Excessive Suds

   Using standard dish soap or too much detergent creates thick foam that can lift the float dome, causing the dishwasher to register an F8 E4 error.
5. 5
   Drainage Obstructions

   If the drain hose or pump is blocked, water from a previous cycle remains in the tub, causing the sensor to trip during the next fill phase.

How to clear / reset

To attempt a quick reset of the F8 E4 error, hit the Cancel/Drain button to empty any remaining water. After the drain cycle finishes, flip the circuit breaker off for about 3 to 5 minutes to power-cycle the control board. Open the door and check the plastic float dome, typically located in the front right of the tub. Push it down gently to ensure it moves freely and listen for a subtle 'click' from the switch beneath it. If the float is jammed or there is an active leak, the F8 E4 code will reappear as soon as the unit attempts to fill again.

Common replacement parts

FAQs