Bosch Dryer Error Code F:04

F:04 indicates that the dryer has detected a problem in its airflow or water drainage system, a fault in the conductivity sensor circuit, an ambient temperature above 30 degrees Celsius, or that the machine has reached its 240-minute maximum runtime limit. The code is a protective shutdown to prevent overheating or inaccurate drying cycles. In most cases the root cause is a blocked lint filter, a full condensation tank, or a dirty heat exchanger.

A reset may temporarily clear the F:04 display, but the code will return if the underlying cause has not been addressed. Always clean the air and water passages and confirm adequate room ventilation before attempting to restart the dryer. If the fault is caused by a shorted conductivity sensor or a wiring issue, a reset alone will not resolve it.

If the fix is simply cleaning the lint filter, heat exchanger, or water passages, the cost is minimal and requires no parts. If a conductivity sensor or associated wiring needs replacement, parts and labour costs typically range from 80 to 200 dollars depending on your location and the specific components involved. A technician call-out fee alone can range from 50 to 100 dollars, so performing the basic cleaning steps first is advisable.

Many F:04 faults can be resolved without professional help. Start by cleaning the fluff strainer, emptying the condensation tank, and clearing any debris from the heat exchanger and water passages. If the error persists after these steps, the issue may involve the conductivity sensor circuit or an internal component, which would require a technician to run the conductivity test programme and inspect wiring.

You should not continue running the dryer while F:04 is active. The code indicates that the machine has shut down to protect against overheating or an unresolved system fault. Continuing to force operation without resolving the cause could damage internal components or create a fire hazard, particularly if airflow is severely restricted.