Floor heating control flap opens & closes several times on start-up

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Feet area air control flap opens & closes several times on start-up

The car is a 2003 "C" Class 270 CDI.

There's a problem with the electrically controlled flap that opens and closes the air supply to the feet area.

When I turn on the ignition, the feet area heating vent opens and closes about 5 times and then stays either in the open or closed position. If it's closed and I want get heat in the feet area I cannot change it. It remains closed even if I try adjusting the interior heating controls - like switching between manual and auto or turning the right hand manual air-flow direction knob. This has no effect and the vent remains closed.

This is a real pain as on a cold morning because if it stays in the closed position, my feet get freezing cold!

Any ideas please?
 
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