HEATING COMES ON WITHOUT REQUEST ON ITS OWN ACCORD EVEN WHEN CONTROL IS IN HOT WATER MODE ONLY,HEATING UNTIL BOILER LOCKS OUT

JOHN, August 2008

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