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heating comes on without being called for?

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