I have a Hotpoint WML540 just over 2 years old. When the wash cycle appears to be complete it stops and every light flashes rapidly. I then have to power off , power up again change to dry only to complete the cycle. A local washing machine engineer has checked all components are ok and has said I need to call out Hotpoint as they are the only ones who can put in a new control unit and programme it. Is this correct please or is there another way to solve this?