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Mr_Sworld
Yeah, I think it should be easy enough. As long as the mechanical valve is sound and just the electrical header needs replacing.
BUT, I am still not sure I totally understand the system. So I am not 100% on the diagnosis.
The setup is as follows:
We have a combi boiler, and a backup immersion heater in a big tank that I can turn on if the boiler fails. (I have turned it on, so at least we have hot water right now.)
The valve that seems to be permanently "open" is one that (I think) is between the boiler and the immersion tank.
So, I THINK, that the way it is supposed to work is for the valve to be (somehow) triggered to close when I want direct hot water and NOT use the immersion tank.
This is where my understanding fails. I'm not sure the above is correct. I'm also not sure how the valve would "know" how to fill the immersion tank or not.
Anyone have any wisdom to share?