Bosch Dishwasher Error Code E:12

E:12 means the dishwasher's control board is only receiving a signal from one of its two NTC temperature sensors. The machine shuts down as a heater protection measure because it cannot safely verify wash water temperature with only one functional sensor. The fault points to a failed sensor, a damaged wiring connector, or a broken wire in the sensor circuit.

No. The dishwasher shuts itself down specifically to protect the heating element from running without verified temperature feedback. Attempting to bypass or repeatedly reset the error without fixing the underlying fault could lead to overheating or damage to internal components.

A reset may temporarily clear the error code, but it will return as soon as the control board detects that only one NTC is providing a signal. Resetting does not address the underlying sensor or wiring failure, so the dishwasher will either refuse to complete a cycle or shut down again shortly after restarting.

If you are comfortable using a multimeter and working with appliance wiring, you can test the NTC sensors and inspect the harness connectors yourself. Replacing a faulty NTC sensor is a relatively straightforward repair. However, if the control board is the root cause, replacement requires more experience and careful handling of the electronics.

If the fix is a wiring connector or a single NTC sensor, repair costs are generally in the range of $75 to $200 including parts and labor. If the main control board needs replacement, costs can rise to the $200 to $450 range depending on the model and service rates in your area.