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Central Heating

My 40 yr old glow

this has a donk when it switches off sounds like a sticking valve if one is fitted

1 Answer from a MyBuilder Heating Engineer

It may be a motorised valve connected to the system. When the power to the valve shuts down, most modern motorised valves have a spring return to close function. If the motorised valve seating or spring is worn, this can cause water hammer which can sound like it is produced from the boiler.
Kind regards


Answered 8th Jul 2015

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