Bosch Dishwasher Error Code Open or short circuit Door thermistor (Normal/Normal)

This error code means the control board detected a temperature reading from the door thermistor that fell below 32°F or above 210°F, which are outside the boundaries of a valid signal. Rather than reflecting actual extreme temperatures, these out-of-range readings indicate that the thermistor circuit has an open break or a short circuit. The dishwasher flags this condition to prevent operating with unreliable temperature data.

Running the dishwasher with an active door thermistor fault is not recommended. The control board relies on temperature sensor data to manage heating and drying cycle timing, and operating without a valid sensor reading can result in improper cycle behavior. It is best to resolve the fault before running additional cycles.

A power reset by unplugging the dishwasher or switching off the circuit breaker for a few minutes may temporarily clear the error code, but it will return if the underlying fault in the thermistor or its wiring has not been corrected. A reset is useful for confirming whether the fault is intermittent, but it is not a permanent fix. The thermistor circuit needs to be inspected and repaired to resolve the code reliably.

A knowledgeable DIYer can diagnose this fault by visually inspecting the door wiring harness for visible damage, checking that the thermistor connector is clean and fully seated, and testing the thermistor resistance with a multimeter. If the sensor itself is faulty, replacing it requires disassembling part of the door panel, which is manageable with basic tools and the correct replacement part. Wiring repairs in the hinge area may require soldering or connector replacement and are more involved.

If the thermistor sensor itself needs replacement, parts typically range from around $15 to $50 depending on the specific model. If a professional technician is needed for diagnosis and replacement, total repair costs including labor generally range from $100 to $250. Control board replacement, if required as a last resort, would cost significantly more.