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No sorry Ollski, that was an earlier mistake which I thought I had rectified, because I had not seen the system and was just going on what someone had said... It is wired correctly to a fused 3A spur.

OilMan... I understand that, But to measure the current across where.. i have eliminated the pump,and motorised valves, I do have a tester but where do i start.. should all the components inside the boiler have full mains voltage running through them or are they reduced through a transformer...

Well..... All the best made plans are designed to go wrong.. !!!! After the pump had been changed all appeared to be going well until, Guess What... The fuse keeps on blowing again, i have issolated all the electrical components in the heating system and they are all "sound" and I am pretty sure...

Gentlemen.... Many Thanks... it was a faulty pump that was causing the problem. Changed and working fine now...

I will check the motorised valves and report back.. As i mentioned it is not in my house so I will check it out ... In the meantime... Thank you :lol: :lol:

Sorry Gents.. How can I expect you to answer when I do not give you the correct information... Let me start again... I was going on somebody elses description.. The boiler is a Concord WCF255A and it is not a gravity fed system, it is pumped and has 2 way motorised valves. The fuse that blows...

The main fuse is a 3 Amp... What is the best and most methodical way to eliminate the parts of the boiler that require a feed from the mains. I have put different demands, H/W and C/H on it and it stilll blows. I take it I should test the fan etc with a meter but what is the right sequence etc...

Can somebody please offer any advice on a problem with a boiler. The boiler in question is a conventional one that forms part of a gravity fed system, and has a 3 way motorised valve (which was replaced a few months ago). The boiler is a Concord WCF255A. The main fuse keeps blowing on my main...