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Potterton promax SL boiler issue?

i have a potterton promax SL boiler. Since the cold spell the boiler has had a mind of its own and stays on even when the timer goes to off. I have just taken the timer off completely and the boiler has come on on its own. The boiler does not have a frost stat (that i can see), any ideas what it could be???
chris, December 2010
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