The water temp. has become very hot occasionally leading to a (overtemp.) shutdown. I suspect the factory set heat modulation...Point R on the flow diagram. Sods Law: that is the page that is missing from my servicing instruction booklet. Anybody able to help in what it says?

Mark T, July 2008

Is it the page in the flow diagram that deals with failure at point R that you are after?

Rich, September 2008