Jenn-Air Dishwasher Error Code E:12

E:12 means the dishwasher's NTC thermistor is producing resistance values outside the permitted range. The NTC is the component responsible for monitoring water and air temperature during cycles. When this fault is detected, the appliance disables the heater and continues running without any heating function. The cause is typically a failed thermistor, a broken wire, or a faulty connector plug.

The dishwasher is designed to disable the heater when E:12 is triggered, which prevents overheating and reduces immediate safety risk. However, running the appliance without the heater means wash water stays cold and dishes will not dry properly, significantly reducing cleaning effectiveness. It is best to diagnose and resolve the fault before continued regular use.

Resetting the dishwasher may temporarily clear the E:12 code, but if the underlying fault with the NTC thermistor or wiring has not been corrected, the error will return once the control board detects the out-of-range resistance again. A reset is useful for confirming whether the fault is intermittent, but it is not a repair. The thermistor and wiring circuit need to be properly diagnosed and repaired for the code to stay cleared.

A knowledgeable DIYer can diagnose this error by using a multimeter to measure the resistance of the NTC thermistor and checking the wiring and connectors for damage or corrosion. If the thermistor is out of spec, replacing it is a straightforward repair. Wiring repairs require some electrical skill, and any work involving the control board is generally better left to a qualified technician.

If only the NTC thermistor needs replacement, parts typically cost between $15 and $50, and a professional repair including labor could range from $100 to $200. If the wiring harness or control board is involved, costs can increase to $150 to $400 or more depending on the extent of the damage. Getting a diagnostic visit from a technician before committing to repairs is a practical approach.