Bosch Dryer Error Code 3

Error code 3 on a Bosch dryer indicates an NTC R2 fault, meaning the heater air temperature sensor is not producing a valid signal. The Cupboard Dry LED in the progress indicator flashes to alert you to this condition. The control board monitors the resistance from this thermistor to regulate heating, and when that resistance falls outside acceptable limits, the dryer stops operating. The fault can originate from the sensor itself, its connecting cable, or the plug-and-socket connection.

You should not continue running the dryer while error code 3 is active. NTC R2 provides temperature data that the control board uses to manage heater output safely. Without accurate readings from this sensor, the dryer cannot properly regulate heat, which could create a risk of overheating. The dryer is designed to stop operation when this fault is detected for exactly this reason.

Repair costs vary depending on the root cause. If only the plug-and-socket connection needs cleaning or reseating, there may be little or no parts cost involved. Replacing the NTC R2 thermistor itself is generally a lower-cost repair, with parts typically in the range of $15 to $60 depending on the model. If a wiring harness needs replacement, parts and labor combined can range from $80 to $200 or more.

A knowledgeable DIYer with a multimeter can check the NTC R2 sensor resistance and inspect the cable and connectors for obvious damage or corrosion. If the connector is simply loose or dirty, reseating or cleaning it may resolve the fault. However, if the thermistor or wiring needs replacement, comfort with disassembling the dryer cabinet and working around heating components is required, so many homeowners prefer to call a technician.

A power reset may temporarily clear the error display, but the fault will return as soon as the dryer attempts a cycle and the control board reads an out-of-range signal from NTC R2 again. The underlying problem with the sensor, cable, or connection must be diagnosed and corrected for the error to clear permanently.