Bosch Dryer Error Code E:85

E:85 indicates a fault with the NTC thermistor in the refresher cycle circuit. The NTC is a temperature-sensing resistor, and the control board has detected a reading outside the acceptable range. The dryer stops operation until the fault is resolved to prevent any risk of overheating. The most likely fix is replacing the refresher NTC or repairing its wiring connections.

A power reset may temporarily clear the error, but if the underlying fault with the NTC thermistor or its wiring remains, the code will return once the dryer attempts the refresher cycle again. Resetting without diagnosing and fixing the root cause is not a lasting solution. The NTC circuit must be tested and repaired or replaced to permanently resolve E:85.

If only the refresher NTC thermistor needs to be replaced, the part cost is typically in the range of $15 to $50 depending on the specific model. If professional labor is required, total repair costs including parts and labor generally range from $100 to $250. Repairs involving wiring harness replacement or control board issues will fall toward the higher end of that range.

If you are comfortable using a multimeter and working with appliance wiring, you can start by checking the NTC connector for looseness or corrosion and reseating it firmly. If the connector looks fine, you can test the NTC resistance and compare it to the expected value for the ambient temperature. If the sensor reads open or shorted, replacing the refresher NTC is typically a straightforward repair. However, if wiring damage or a control board issue is suspected, a qualified technician should perform the repair.

The dryer displays E:85 precisely because the temperature sensing circuit for the refresher function is not operating correctly. Running the dryer without a functioning temperature sensor in this circuit removes a key safeguard against overheating. It is best to avoid using the dryer until the fault is diagnosed and resolved.