Bosch Washer Error Code d:06

The d:06 code indicates an NTC thermistor and relay fault, specifically that the NTC temperature sensor is reading an excessively high temperature or the heating relay has become stuck in the closed position. Both conditions affect the washer's ability to regulate water temperature safely. The control board triggers this code as a protective measure to prevent overheating.

Continuing to operate the washer with an active d:06 code is not recommended. A stuck heating relay can cause the water to overheat beyond safe levels, potentially damaging internal components or posing a burn or scalding risk. It is best to stop using the machine until the NTC and relay have been inspected and repaired.

Repair costs depend on which component has failed. Replacing an NTC thermistor is generally the least expensive fix, typically ranging from around $30 to $80 in parts. A heating relay replacement or a full control board replacement can range from $100 to $350 or more depending on the board's availability and complexity. Adding professional labor costs of $80 to $150 per hour, total repair bills can vary widely based on the root cause identified during diagnostic testing.

Diagnosing d:06 requires running test P4 to evaluate the heating circuit, then checking the NTC thermistor resistance and relay switching behavior. A knowledgeable DIYer comfortable with electrical testing and disassembly can perform these checks, but replacing the relay or control board involves working near line-voltage components and carries safety risks. If you are not experienced with appliance electrical repairs, having a qualified technician handle this code is advisable.

A power reset may temporarily clear the d:06 code from the display, but if the underlying fault with the NTC thermistor or heating relay persists, the error will return during the next wash cycle. Clearing the code without addressing the root cause does not resolve the problem and the washer may continue to malfunction or present a safety hazard.