heating comes on without being called for?

I had the same problem with my biasi boiler called an engineer he quoted me £300 at the end I maange to diagnose the problem myself and got it working for £20. Common problem with this is that the CH pressure switch is buggered. Does you boiler has a small water leak, this will inside the boilder.

raj
October 2008

diverter valve problem

bosun
August 2008