KitchenAid Dishwasher Error Code 6-4

The 6-4 code means the float switch is reading an open circuit, which the control board interprets as an overfill condition or a safety switch failure. The float switch is a small sensor that detects rising water levels in the tub. Possible causes include a jammed float, an unlevel dishwasher, excess suds, a stuck fill valve, a shorted fill valve triac, or a blown fuse in the switch circuit. The dishwasher will not complete its fill cycle until the condition is resolved.

You should not continue using the dishwasher until the cause of the 6-4 code is identified. If the float switch circuit has failed or the fill valve is stuck open, running the dishwasher risks water overflowing the tub and causing water damage. Resolve the fault before resuming normal use.

Repair costs depend on the root cause. If the float simply needs to be cleared of debris or the dishwasher just needs to be releveled, the cost can be minimal. Replacing a float switch typically runs in the range of $20 to $60 for the part. A fill valve replacement generally costs between $30 and $80 in parts, while control board repair or replacement for a shorted triac can range from $100 to $300 or more depending on the board. Adding professional labor will increase these estimates.

Start by checking the float assembly at the bottom of the tub for any debris or items that may be holding it in the raised position. Move the float up and down by hand to confirm it travels freely and produces a clicking sound from the switch. Verify the dishwasher is level and measure the resistance across the float switch contacts to confirm the switch is functioning. If the switch and float are fine, inspect the fill valve and check the drain hose check valve for proper sealing.

A reset may temporarily clear the code, but it will return if the underlying fault is not corrected. If the float is mechanically jammed, the dishwasher is out of level, or a component like the fill valve or fuse has failed, the condition will persist and the code will reappear. Address the root cause before relying on a reset.