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    Expansion tank constant dripping & gush when CH on

    Hi all - hope you can help. Recently moved to new (old!) house. 25 yr old Potterton Kingfisher boiler. All rads came on a bit when hot water went on. As was summer & no valves on any rads, I closed all valves with pliers. Recently as it's getting cold, I asked someone to fit TRVs on...
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