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Thanks boys, to the sarcastic ones among you, if you bothered to read what I wrote you would have found all the info. It didn't take me long to add info as requested or as it came to me, it's not my problem if you missed it. If I was an electrician I wouldn't need to post questions here would I...

That's right, the extractor and the light were on the same circuit and the extractor was causing the problem. When you switched on the light you also switched on the extractor. Once that was taken out the problem was gone. I think he said there was a problem with the earth but beyond that I...

Thanks to everybody for your replies. I've had an electrician in and it was the extractor which is now out of commission but the light works.

It's a conversion. I suppose that could still be the cause, the place above was completely gutted and rebuilt but this was finished 5 month ago. Another thing has occurred to me which is that there is also an extractor built into the circuit which could have a fault or even got water in.

I just wired it the same as the other using C at the top and L1 at the bottom. There is an earth cable which I just left alone. There's been work carried out to the property above but the main problems from there are usually to do with water leaking which was my first thought when it happened.

So everything had been working fine, and without you changing/adding/fiddling with anything whatsoever on that circuit the fuse started blowing whenever you turned the light on? That's exactly right. What was the fault, and how did you notice it? I noticed the switch was faulty just...

One wall mounted light switch is causing the lighting circuit fuse on the consumer unit to blow. All other switches work fine. I noticed the switch was faulty so have changed it but the fuse still blows. Problems in changing the switch are that the wiring is old so the cables are black and red...

Thanks I'll take your advice. Last question, is this a central heating engineer problem or an electrician, or doesn't it matter?

Well, it looks that way as there is no other obvious fuse unless it's lurking somewhere among the jumble on the backing plate. I've only given it a quick look but I was expecting to see a fixed fuse holder. It wouldn't altogether surprise me if there wasn't one as I think the whole cast of...

I'm referring to the one in the main fuse box which is 5A. I see on the wiring diagrams for the timer that there should be a 3A fuse but I can't figure out where it might be located. The backing plate is attached to the wall and the wires seem to come straight out of the wall into the plate...

That makes sense, I don't have a test meter to hand but it's an obvious first step, when it's pointed out to you. The new clock is a Siemens RWB2E, the old one a Wickes RWB200.

Sorry, not concentrating, of course it's not a rechargeable fuse, it's a rechargeable battery. Original message now corrected.

I have an ancient Ideal boiler as part of an equally ancient system. Last week the mains fuse blew and after replacing it I found that the controller was dead. I've done various things such as changing thebattery in the controller, which confuses me a bit as it's a rechargeable battery with no...