Jenn-Air Dishwasher Error Code 9-4

Error code 9-4 indicates a diverter problem. The diverter is the valve assembly that directs water between the different spray zones in the dishwasher. The control board detected that the diverter is not operating as expected, which can mean the internal red plastic disc is missing, the diverter motor has failed, or a sensor or wiring issue is preventing the board from confirming diverter movement.

Running the dishwasher with an active 9-4 code is not advisable. Because the diverter controls which spray arms receive water, a malfunctioning diverter means some or all of the dish load may not be washed or rinsed properly. In some cases the dishwasher will stop mid-cycle on its own. Continuing to run cycles without resolving the fault can also mask worsening damage to the diverter motor or pump assembly.

The diverter assembly is typically located at the bottom of the dishwasher tub, beneath the lower spray arm. Remove the lower rack and unscrew or unclip the lower spray arm to access the outlet cover. With the outlet cover removed, look through the holes in the cover to check for the red plastic disc inside the diverter. If the disc is visible and seated correctly, the next step is testing the diverter motor and sensor per the service documentation for your specific model.

Start by removing the outlet cover on the diverter assembly and looking through the holes for a red plastic disc. If the disc is missing, replacing it often clears the code. If the disc is present and intact, consult the Service Error Codes table referenced in the dishwasher's service documentation to run further diagnostics on the diverter motor, position sensor, and associated wiring. A multimeter is useful for testing motor resistance and checking for continuity through the wiring harness.

If the fix is simply replacing the missing red plastic diverter disc, the part typically costs under $20 and the repair can be done without special tools. If the diverter motor needs replacement, parts generally run $40 to $100 depending on the model, and a service technician will add $100 to $200 or more in labor. Wiring repairs fall somewhere in between, depending on whether a harness assembly needs to be replaced or just a connector reseated.