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swiftflow75 pcb fuse blowing?

the 0.63amp fuse on the pcb blowing every 2 or 3 days of using boiler,what is this fuse controlling and what part of the boiler needs to be changed to stop this fault
steve, May 2009
This fuse supplies power to the PCB. Check the transformer this should be giving no more than 24V ac

M, June 2009
with the fuse blown the pump and fan works,the pilot is alight but the boiler fails to fire up

steve, May 2009
Check the Pump, or The Fan

www.elanar.co.uk, May 2009