Bosch Dishwasher Error Code NTC failed

NTC failed means the dishwasher's control board has detected a fault in the NTC thermistor circuit, the component that measures water temperature. The thermistor is either short-circuited, open-circuited, or the wiring connecting it to the control board is damaged. The machine stops operating because it cannot reliably monitor or control water temperature without a valid sensor signal. On some models this condition is displayed as a pattern of flashing indicator lights during a diagnostic cycle.

A reset may temporarily clear the fault code, but the error will return if the underlying problem is not repaired. If the thermistor is open or short-circuited, or the wire harness is damaged, the control board will detect the fault again as soon as the machine runs a cycle. A reset is only useful for clearing a code after a confirmed repair has been made.

If the fault is limited to a damaged wire harness or loose connector, the repair cost may be minimal, primarily your time. Replacing the NTC thermistor itself is generally an inexpensive repair, with parts typically ranging from a few dollars to around $30 to $50 depending on the model. If the control board turns out to be the cause, repair costs increase significantly, often ranging from $150 to $400 or more including parts and labor.

Yes, this repair is within reach for a confident DIYer with a multimeter. Start by disconnecting the NTC thermistor and measuring resistance at its terminals. At 20°C (68°F), a good sensor reads approximately 5.4 to 6.5 kilohms. If the reading is outside this range, the sensor needs replacement. If the sensor tests correctly, inspect the wire harness for damage, corrosion, or loose connectors before assuming the control board is at fault.

It is not recommended to continue running the dishwasher with this fault active. Without a working temperature sensor, the control board cannot regulate water heating accurately, which could result in water that is too cool to clean effectively or, in some failure modes, overheating. The machine will typically halt operation on its own as a protective measure, so further use is not likely to be possible until the fault is resolved.