ASKO Dryer Error Code F3

F3 on an Asko dryer signals a thermistor fault, meaning the control board detected an open circuit or short circuit in the temperature sensor. The thermistor is mounted on the fan casing and is responsible for monitoring air temperature during the drying cycle. When the resistance reading falls outside the expected range of 40 to 60 kohm at room temperature, the dryer interrupts the program and displays F3 to prevent uncontrolled heating.

No, you should not continue operating the dryer while F3 is active. The thermistor is the primary temperature monitoring component, and without accurate sensor data the dryer cannot regulate heat safely. The program is interrupted automatically for this reason, and running the dryer with a bypassed or faulty sensor creates a risk of overheating.

A power reset may clear the error display temporarily, but F3 will return as soon as the dryer attempts to run and the control board reads the faulty thermistor signal again. The underlying fault in the thermistor or its wiring must be identified and corrected before the error will stay cleared. Repeatedly resetting without addressing the root cause will not resolve the problem.

A knowledgeable DIYer can diagnose F3 using a multimeter to check thermistor resistance and inspect the wiring harness for broken or loose connections. If the thermistor itself has failed, replacing it is a straightforward repair involving disconnecting the sensor from the fan casing and fitting a new one. However, if the wiring harness or control board is involved, the repair becomes more complex and professional service is recommended.

Repair costs vary depending on the root cause. A thermistor part is generally in the range of $15 to $50, making it one of the more affordable fixes if wiring is intact. If a service technician is needed for diagnosis and installation, total costs including labor typically range from $100 to $250. Control board replacement, if required, can bring costs considerably higher.