Another reason the machine will fill up to maximum, is due to a fault with the small tube, leading to the underside of the pressure switch, due to it's location, between the drum and the metal side of the machine, the rubber pipe can become eroded, due to the drum rubbing as it rotates, against the tube, and over time will develope a hole, thus not allowing the pressure switch to recieve enough pressure, to allow the swith to operate.
Solution-Replace the thin tube,about a fiver
Sgt Bilko, August 2009