A plumber drained the system, replaced the valve and refilled the system.
When I got home that night I noticed that there was water dripping out of the overflow pipe from the loft. Which was new.
Checking in the loft, I have 2 tanks, a large one and a small one next to it. The small tank (which I believe to be the expansion tank?) was full to the overflow outlet. I manually drained some water and checked the ballcock mechanism and that is functioning fine. However the tank keeps filling up to the overflow.
Its not a major issue, but I would like to remedy it. Also, the annoying drip drip drip on my conservatory roof will eventually get my wifes attention and then it will be a much higher profile issue!.
Does anyone have any clue what the problem might be or how to fix it?
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