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I require help with my central heating boiler?

The boiler is a Glow-worm 55F whiich starts normally but after a few seconds cuts off. After 3 or 4 minutes it re-ignites then runs again for a few seconds and so on.
At this rate it will take a month to heat my living room!
Any ideas please.
DHT,Portsmouth, October 2008
Could be fan breaking down when hot
Need to use multimeter full diagnostics

yas, October 2008
link Click here to see other fixes for Glow-worm 55F.