Jenn-Air Dishwasher Error Code 6-4

Code 6-4 means the control board is reading an open signal from the float switch, which is the overfill safety switch located under the tub floor. The board interprets this as the dishwasher being in an overfill condition and stops operation to prevent water damage. The most common causes are a stuck float, an unlevel unit, or a failed switch.

The dishwasher will not complete a wash cycle with 6-4 active because the control board halts the fill process when it detects this fault. Do not attempt to bypass the float switch to force operation, as the float switch is a water overflow protection device. Resolve the underlying cause before running the unit.

Yes. The float relies on gravity to sit in its lowered, resting position when there is no overfill condition. If the dishwasher leans forward or to one side, the float can rest in a partially raised position, holding the switch open and triggering 6-4. Place a level on the bottom rack or door frame, and adjust the leveling legs until the unit is flat before running any further diagnostics.

Start by opening the dishwasher and locating the float, which is a small plastic dome or cap near the front bottom corner of the tub. Clear any debris from around and under it, then press it down and release it by hand to confirm it moves freely and you can hear the switch click. Next, use a level to check that the dishwasher is sitting flat, and adjust the front leveling legs as needed. If the float moves freely and the unit is level but 6-4 persists, use a multimeter to check switch resistance per the Fill Strip Circuit diagram and replace the switch if it reads open.

If the cause is a stuck float or an unlevel dishwasher, the repair costs nothing beyond your time. A replacement float switch typically costs between $15 and $40 for the part. If you hire a technician to diagnose and replace the switch, expect a total repair cost in the range of $100 to $200 depending on your location and service rates.