Jenn-Air Dishwasher Error Code 3-1

Code 3-1 means the control board has detected an open circuit in the Temperature Sensing Circuit. The board is not receiving a valid signal from the thermistor or OWI temperature sensor. This can be caused by a disconnected wire, a broken connector in the circuit, or a failed thermistor.

Running the dishwasher while code 3-1 is active is not recommended. Without a functioning temperature sensor signal, the control board cannot monitor water temperature, which means the wash cycle may not heat water to the correct level for proper cleaning and sanitation. The dishwasher will likely stop mid-cycle or refuse to start. Resolve the error before regular use.

Unplug the dishwasher, then disconnect the thermistor from its wiring harness. Set a multimeter to measure resistance (ohms) and probe both terminals of the thermistor. At room temperature, a functioning thermistor should show a measurable resistance value, typically in the range of several thousand ohms depending on the model spec. A reading of infinite resistance or open line (OL) confirms the thermistor has failed and needs replacement. Check the tech sheet inside your dishwasher door panel for the exact resistance specification for your model.

Start by running the Service Diagnostic Cycle to observe temperature sensor behavior. Then unplug the dishwasher and use a multimeter to check all wiring connections and components in the Temperature Sensing Circuit for continuity. Reconnect any loose connectors and replace any wiring or components that show an open reading. If the wiring and sensor both check out, the control board input may be faulty and the board would need replacement.

If the fix is simply reseating a loose wire connector, there is no parts cost. A replacement thermistor typically costs between $20 and $60 depending on the model. An OWI sensor can range from $30 to $80. If the control board is at fault, parts alone can run $150 to $300 or more. Professional labor adds $100 to $200 on top of parts, so diagnosing and fixing the wiring yourself first makes financial sense before committing to board replacement.