Have removed circulation pump and checked the impeller – didn’t find anything. It rotates, with modest resistance – can be rotated with a finger easily enough. Not sure how to electrically test the pump motor. Did check the associated small motor (appears to move a device which diverts the flow) – has resistance of circa 4.5k ohms, and the micro switch associated with the small motor – seems functional. Running out of ideas …..
Hello Dave
The pressure switch that was changed was the one that sits on the circulation pump. I couldn’t see anything wrong with the ball bearing or the black rubber seal that it fits into. Peter has got back to me and stated that his problem was somehow determined to be the circulation pump – but he hasn’t yet answered a further query as to exactly what was wrong with the pump. He decided to buy another dishwasher rather than pay for a new pump!