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Trying to Diagnose why Tank in Loft Overflowed

Postby Eddie_ » Tue Jan 05, 2016 7:55 pm

Hi, hope someone can help. Came home after a few days away recently to a flooded house caused by a faulty overflow. That's been fixed but I'm trying to work out why the tank water level in the loft raised.

The ball valve was fine but I've replaced it anyway and while we were away the heating was on but I had turned the hot water off.

While in the loft isolating the water and dealing with the flood, the level of water in the tank was much higher than normal and while looking water spouted from the hws overflow into the tank. Obviously that looked like the problem if the ball valve was ok but I cannot replicate it in any situation !

My system is unvented heating with a pressure vessel feeding an indirect hws cylinder via a motorised valve. There does not appear to be a leak via the indirect copper cylinder and the tank stat is fine.

Any help or ideas very gratefully received !!
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