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