Jenn-Air Dishwasher Error Code E:28

E:28 indicates an Aqua Sensor fault, meaning the control board cannot successfully communicate with or calibrate the water-clarity sensor. This sensor normally monitors how dirty the wash water is to adjust cycle length automatically. The dishwasher will continue to operate in a default mode without the sensor's input. Common causes include a dirty sensor lens, wiring issues, or the unit not being equipped with the sensor.

Yes, the E:28 fault does not indicate a safety hazard. The dishwasher is designed to continue running without Aqua Sensor input, defaulting to fixed cycle times. You may notice slightly longer or less efficient cycles since the machine can no longer optimize based on water clarity, but continued use does not pose any risk.

If the fix is simply cleaning a dirty sensor lens, the repair costs nothing beyond your time. Wiring repairs are also generally low-cost. If the Aqua Sensor itself needs replacement, parts typically range from $30 to $80 depending on the model, with professional labor adding $100 to $200 on top of that. A control board replacement, if needed as a last resort, is the most expensive outcome and can range from $150 to $350 or more for parts alone.

In many cases, yes. Start by checking whether the Aqua Sensor lens is coated with grease or mineral scale and clean it gently if so. Also inspect the wiring harness and connectors for loose or corroded terminals. If cleaning and reseating connections do not resolve the fault, sensor replacement may be needed, which is a more involved repair but still within reach for experienced DIYers.

A reset may temporarily clear the code, but it will return if the underlying cause has not been addressed. If the sensor is dirty or disconnected, the control board will attempt calibration again at the next cycle start and log the fault again. Resolving the code permanently requires fixing the root cause, whether that is cleaning the sensor, repairing the wiring, or replacing a failed component.