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Hi I've just had a new combi boiler installed and ever since the overflow from the cold water tank in the loft has been overflowing. It stops when I run my tap so I know that it's my tank (property of 4 flats) We've replaced the ball valve and it's still leaking. When we were up there we...

Had this installed a couple of weeks ago and still getting used to it so this may be a stupid question. Sometimes it will switch from central heating to hot water when I'm not running any water from anywhere with accompanying clunking sounds like a tap has been turned on (and I live on my own so...