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I thought that might be the answer. Well we left that gate valve shut off for around 30 minutes and the f/e tank level didn't rise. I have turned the gate valve back on and the f/e tank is starting to rise again....So guess new cylinder. Thank for your help. Couple of quick questions...

We've shut off the valve from the CWS to the Hot Water Cylinder. I've emptied out a small amount of water from the f/e tank so it's just below the pipe and stops dripping. Can you clarify how this will help the f/e tank from overflowing? Will the f/e tank keep overflowing until the water...

Can we close of this valve as a permanent solution? I suspect not? Does this just help troubleshoot the cause?

Sorry for the confusion. The tank in the loft which is overflowing is the small f/e tank. It has a pipe attached to the bottom of the f/e tank which seems to go to the airing cupboard. I just followed the pipe and it appears to attach to a red grundfos device. Was it that? Does that...

Hello, My wife and I and trying to find the cause of the feed and expansion tank overflowing. First of all, here's a brief description of what kind of system we have. Boiler downstairs in the kitchen, hot water tank with immersion in the airing cupboard, a large cold water tank in the...