Bosch Dryer Error Code 2

Error code 2 on a Bosch dryer indicates a fault with NTC thermistor R3, the exhaust-air temperature sensor. The dryer signals this by flashing the 'Iron dry' LED in the progress indicator. The fault can be in the thermistor itself, the wiring cable, or the plug-and-socket connection. The dryer will not operate normally until the fault is resolved.

Running the dryer with error code 2 active is not recommended. The exhaust-air temperature sensor is part of the system that monitors thermal conditions during operation. Without a reliable temperature reading from NTC R3, the dryer cannot properly regulate heat, which could lead to inadequate drying or, in a worst case, unsafe operating conditions.

Repair costs depend on where the fault lies in the NTC R3 circuit. If the fix requires only cleaning or reseating a connector, costs are minimal. Replacing the NTC R3 thermistor itself typically involves parts costs in the range of $15 to $60, plus labor if a technician is used, which can bring the total to $100 to $250 depending on your location and service provider.

Start by unplugging the dryer and inspecting the NTC R3 sensor, its cable, and the plug-and-socket connector for visible damage, corrosion, or loose connections. Test the thermistor's resistance with a multimeter to determine if the sensor has failed. If the wiring and connectors are in good condition but the thermistor reads out of specification, the sensor will need to be replaced.

A reset may temporarily clear the displayed error, but the code will return if the underlying fault with NTC R3, its wiring, or its connector has not been corrected. The fault must be diagnosed and repaired at the component level to permanently resolve the error.