flow meter failure?

I have a adp962 that also gives me the same f7 error. I havent managed to fix it yet, I always turn it on its side, open the bottom, give all the hoses and electronics and parts a good whack and shaking, put the bottom plate back on and hey, presto: it works! (for about ten times, and then it gives the same error again). Does anyone have the REAL answer?

Mirco de Haas
May 2007