ASKO Dryer Error Code F9

F9 on an Asko dryer indicates a front thermistor fault. The control board is not receiving a valid signal from the front thermistor, either because the thermistor has failed or because the electrical connection between the thermistor and the control board has been lost. When this fault occurs, the dryer stops completely and will not resume operation until the issue is corrected.

The dryer stops itself when F9 is triggered, so it will not operate in this condition. This is a protective response, since a faulty thermistor means the control system cannot accurately monitor temperature at the front of the drum. You should not attempt to bypass or override this fault, and the dryer should remain out of service until the thermistor issue is resolved.

A simple power reset is unlikely to permanently clear the F9 fault if the underlying problem, a defective thermistor or a lost electrical connection, is still present. The fault code may temporarily disappear after a reset, but it will return as soon as the control board attempts to read the thermistor signal again. A lasting fix requires inspecting and replacing the faulty component.

A knowledgeable DIYer can address this fault by first inspecting the thermistor connector and wiring harness for loose connections or visible damage. If no wiring issue is found, the next step is replacing the front thermistor, which is the primary repair recommended for this fault. If replacing the thermistor does not resolve the code, further diagnosis of the wiring harness continuity may be needed.

If the repair requires only a new front thermistor, parts costs are typically in the range of $15 to $60 depending on availability and supplier. If a technician is hired to perform the replacement, expect total repair costs including labor to fall in the range of $100 to $250. Costs can be higher if additional wiring components or a control board replacement are needed.