Over flowing expansion tank

Discussion in 'Plumbers' Talk' started by Diddy Dave, Jun 13, 2012.

  1. Diddy Dave

    Diddy Dave New Member

    hello and thank you in advance for any advice given.

    My girlfriend has an old central heating/hot water system. It consists of an old boiler, a hot water tank and feed and expansion tank. A few weeks back, her hot water packed up. Then suddenly there was a loud bang somewhere in the system and the hot water began working again. But now the expansion tank has begun to overflow when the boiler is turned on. I have replaced the ball valve in the f&e tank but I think the water is coming from the vent pipe. Ive read that its possibly a split coil. Sorry for sounding thick, but is this coil in the hot water cylinder - and why would it cause the expansion to overflow? Also, are these expensive/difficult to repair?

    thank you
  2. G Brown

    G Brown New Member

    It does sound like a split coil. A new cylinder I am afraid. Expensive.

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