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Mend Glow Worm 55F Boiler Pcb Overheat

How can I fix my Glow Worm 55F boiler?

Re-Glow Worm 55F Fuel saver boiler.
Fault:- boiler fires up and remains lit for 40secs., it then cuts out for a period of 5mins then restarts and continues this cycle of stop start at the intervals mentioned.
Air flow sensor working ok, overheat stat and control stat are both ok, shorted out to be sure. System water flow and pump confirmed to be ok and room stat checked. As a last resort the PCB was changed but still the same problem. as far as I can see there is nothing else to check or have I missed something. Help in this matter would be greatly appreciated.

James
November 2008
Glow WormGlow Worm 55FHeating, Home Heating SystemsBoiler Pcb Overheat
What was the cheapest Fan assemble replacement you could find ?

steve ( chopsmoss@hotmail.com)
February 2009
Re- Glow Worm Boiler
Thanks Tony, the fan was the problem.

James
November 2008
Re Glow Worm 55f boiler, header tank and system ok,fan pressure s/w contacts remain closed during fan running. Back to the problem. Thanks for replies

James
November 2008
Have you checked the header tank in the loft.If it is empty the boiler will be cutting off as a safety measure.

Tony S
November 2008
Check fan,breaking down when hot

a
November 2008

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Glow Worm 55F Boiler: Stop-Start Issue - Help!