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worcester 24cdi (fitting external expansion tank, now new problem)

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  • worcester 24cdi (fitting external expansion tank, now new problem)

    Just fitted a new external expansion tank as internal one if full of water so pressure gauge blowing PRV off.
    Fitted new tank to CH return as near to boiler as possible and capped off the old one from the tank. Central heating fine and hot water fine when central heating is running. When the hot water is demanded when the central heating is off I get a little bit of hot water then there is banging (sure like an air lock) boilers gets red hot and locks out due to over heat.
    Any ideas its doing my head in!
    I've bled the system pretty sure its air free, all rads are hot to the top. Just got to make sure pump runs when hot water is demanded on its own.
    Thanks in advance