In article , L Reid newsgroup
@removethisxycom.demon.co.uk writes

To be honest I'm a bit baffled as to what
could have shorted, and would appreciate if someone could give me a pointer
in the right direction.

Could be the pump. Disconnect it and try another fuse. Also have a
sniff around the pump to see if you can detect the unmistakable smell of
fried windings.

Needless to say, you shouldn't run the boiler for any length of time
with a non-functioning pump.

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