If the weather is freezing, your condensate pipe is probably frozen. Unplug the condensate drain and drain into a bucket and the boiler should light. I had this problem with my Glow Worm 15HX and am leaving it dripping into a bucket until the weather warms up. If your condensate pipe isn't frozen, the condensate trap inside the boiler probably needs emptying. Again, I had this problem with my 1 year old boiler which I bought to avoid boiler breakdowns!!
Fellow Victim, December 2010