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Mend Valve Central Started

whistling valve?

Hi can anyone tell me what to do one of the valves on my central heating has started to whistle and wont stop,what can I do

Norman Hunnam
December 2010
Sounds like a thermostatic head, turn it on and off, if it still persists take it off and replace. Beyond that if you cant name the tune call an expert.

Plumbo
December 2010

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