Although an old post.. I see that is Was December it was Posted.
It may well be that the condensate pipe that runs from the bottom of the boiler to outside is frozen. ( Providing temp has been sub 0oC )
If your boiler is displaying an 'EA' code, and the reset is not working and it is a Cdi /Greenstar model then this may be the problem.
You are able to 'thaw out' the pipe, which will be white, or grey plastic, by either holding a heat pack, like a hot water bottle against it, or if accessible pouring hot water from a kettle down the length of the outside pipe.
This should be enough to dislodge the frozen element.
Following this, the reset should work.
Kenny Mac, December 2010
