2. Remove the ventilation grill.
3. Unlock the connector and disconnect it.
4. Loosen the three screws (1) and remove the cover (5) from electric motor (2).
5. Check the condition of the sealant on the cover. If necessary, replace the sealant with a new one.
6. Carefully remove the control circuit (4) from the motor housing, holding the circuit by the connector (3).
7. Install in the reverse order of removal.