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Yes that's fine. The terminals that connect to the switch were well corroded, I will give them a clean in the morning.

OK fitted new flow switch, no joy there.

Many thanks kevplumb. ........................................ What's the weather like over there, its bloody freezing here at the mo.

Many thanks kevplumb. The wiring loom in question has three wires, brown black and white. The valve or whatever is connected to the water rather than gas system. Is there any way I can check if this is the problem? ............................................... What a curious world...

I mean by "lay down and die" no gas ignition, on hot water or heating.

:lol: The system has required a water top up every few weeks, and was low on pressure when it packed in. I had a look "under the bonnet" and found that a small leak was dripping water from the pump onto a component underneath, this has corroded. This component has a wire loom entering it...

This boiler was working fine until Sunday morning, and has now decided to lay down and die. I have plenty of DIY experience, but have no intention of messing around with a complex boiler system. However I would be grateful for an indication of what the problem might be before calling an...