it stopped working this morning when i found the condenstate and flue both frozen with a large icycle hanging from the flue. i have thawed them out but it still wont fire, more worryingly the boiler warning light doesnt flash slow anymore but fast indicating a control board fault? help

dave k, January 2010

condensate trap cleared? why do they block up?

dave, January 2010

it may still be frozen somewhere, try where the condensate pipe passes through the wall. otherwise the condensate trap may need to be cleared, that's a job for an engineer.

Ian, January 2010