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Yes I have the same problem, boiler doesn't turn off?

The central heating is on all the time, as the timer doesn't switch off the central heating. I got British Gas in and they removed the board at the front of the boiler containing the wiring system and installed a new one, but it hasn't solved the probl;em, any ideas ?
Nick, December 2008
another common one is hot water flow switch stuck on, but you have not stated make/model

., December 2008
Does the system have a frost stat fitted somehere.If it does this overrides the clock and keeps the boiler running to avoid freezing up.

Tony S, December 2008
link Click here to see other fixes for British Gas.