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Hi, wonder if anyone can help. Its Boxing Day here in the frozen north (Northumberland) and I can't get the boiler to fire up. Not good. Was okay last night but wont fire this morning. When timer is calling for the boiler to fire, the fan starts for a second and runs but immediately...

I have a problem with intermittent firing on a Ultimate 50FF boiler. The boiler starts up ok as normal, comes up to temperature ok and starts to heat up the radiators / HW, with the burner cutting off / on as normal. After about 20 mins or so the main burner cuts out and immediately re ignites...