Heating blower no longer wants to blow...

Hello!
As is already stated in the subject, after 7 years in my possession the cart is actually defective, no quality of the aluminium piles anymore.
VCDS spits out this error...
01273 - Fresh air blower (V2)
17-10 - Control difference - Sporadic

Is there anything anyone can do about it?
Had the blower box open and the two plugs separated and put together again and everything was fine, but today the ventilation/heating has failed again.
Unfortunately, I had the problem that the hose went off from the windscreen washing water and the splash water box with approx. 3-4litres of antifreeze water has flooded, probably because of the error.
But I don't see any lines or connections where a short circuit or mass problem can arise.
Ergo has a circuit diagram for me, or even the solution?