Jenn-Air Dishwasher Error Code E:04

The E:04 error code on a Jenn-Air dishwasher indicates a defective working relay associated with the auxiliary heater in the Zeolite drying system. The Zeolite system uses a mineral-based drying technology that absorbs moisture from dishes during the drying cycle and regenerates itself using heat from the auxiliary heater. When the control board detects that the relay responsible for activating this heater is not functioning correctly, it logs the E:04 fault and disables the auxiliary drying system entirely. The appliance will continue to run standard wash cycles, but drying performance will be noticeably reduced.

The relay in question is located on the power module and is responsible for switching power to the Zeolite heater at the appropriate point in the drying cycle. A defective relay can fail in either the open position, preventing the heater from receiving power at all, or in a welded/closed position, causing uncontrolled heater activation. Either condition triggers the fault. The power module monitors relay behavior and flags an error when the expected switching response is not detected. This is a control-side failure rather than a simple heater burnout, though both components should be inspected.

Diagnostic steps begin with replacing the Zeolite heater itself, as a shorted or failed heater can stress the relay and cause it to fail prematurely. If replacing the heater does not resolve the fault, the power module must be replaced, as the relay is integrated into that assembly. Technicians should also check wiring harness connections between the power module and the Zeolite heater for corrosion, heat damage, or loose terminals before condemning either component.