Miele Washer Error Code F4022

F4022 indicates that the control board has detected the dryer lint filter flap as open, or that switch S22, which monitors the flap position, is defective or has an open circuit in its wiring leads. The machine uses this switch as a safety check before allowing drying operation to proceed. The fault points to either a physical problem with the flap itself, a failed switch, or a wiring issue in the circuit.

The machine will typically not allow the affected cycle to continue when F4022 is active, which is a built-in safety measure. You should not attempt to bypass or ignore this fault, as the lint filter flap monitoring circuit exists to prevent operation in an unsafe condition. Address the underlying cause before resuming use.

If the fix is simply closing or reseating the lint filter flap, there is no parts cost involved. Replacing switch S22 or a damaged wiring harness section will add parts costs, typically in the range of $20 to $80 for the switch depending on the model, plus labor if a technician is needed. A full diagnostic service call from a Miele-certified technician generally runs in the range of $100 to $200 before parts.

If the lint filter flap is simply not fully closed, you can resolve the error yourself by pressing it firmly shut and restarting the machine. Inspecting the wiring harness and connectors for obvious damage or corrosion is also within reach for a confident DIYer. However, replacing switch S22 or diagnosing intermittent wiring faults may require disassembly and a multimeter, which is better suited to someone with appliance repair experience.

A reset may temporarily clear the displayed code, but if the underlying fault with the flap, switch S22, or the wiring has not been corrected, the error will return when the machine attempts the relevant cycle again. A lasting fix requires identifying and resolving the root cause, not just clearing the code.