Bosch Dishwasher Error Code Open or short circuit Door thermistor (Normal & Heat Dry)

This error means the control board detected a temperature reading from the door thermistor that fell below 32°F or above 210°F, both of which are impossible under normal operating conditions. The control interprets these out-of-range readings as evidence of a broken wire, failed sensor, or short circuit in the thermistor circuit. The door thermistor is used during both the Normal wash and Heat Dry cycles, so this fault can disrupt cycle completion and drying performance.

Running the dishwasher with an active door thermistor fault is not recommended. The control board relies on the thermistor to regulate temperature during wash and dry cycles, and operating without a valid sensor reading can result in incomplete cycles or improper drying. Continuing to run the machine without addressing the fault could also mask additional developing issues.

Resetting the dishwasher may temporarily clear the error code display, but it will not resolve the underlying electrical or component fault. If the thermistor circuit remains open or shorted, the code will return as soon as the control board attempts to read the sensor during the next cycle. A lasting repair requires physical inspection, testing, and replacement of the failed component.

A knowledgeable DIYer comfortable using a multimeter can diagnose this fault by testing the thermistor's resistance and inspecting the wiring harness for damage or loose connectors. If the thermistor itself has failed, replacing it is a straightforward repair involving the door panel. However, if the fault is traced to a damaged wiring harness routed through the hinge area or a failed control board, professional assistance may be warranted.

If only the door thermistor needs replacement, parts typically range from $15 to $60 depending on the specific model, and a repair technician may charge between $100 and $200 in total for diagnosis and labor. If the fault involves wiring harness repair or control board replacement, costs can range from $150 to $400 or more. Getting a diagnostic estimate before authorizing repair is advisable.