How can I fix my Halstead Ace High combi?

Not an answer, but just to say exactly the same problem with my Halstead Ace High. Also had same problem last year, and it sorted itself out (the morning of the day the plumber came, no less). He guessed it may have been hole in diaphram which pushes on the microswitch; other postings here and elsewhere on web indicate sludge build-up may also be cause...but I have a water softener. Another problem is with PCB - which I had to have replaced two years ago.

AndrewRH
December 2007