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Harry Bloomfield
 
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Default Knocking sound in central heating system

Simon Elliott was thinking very hard :
Is there anything I can do with this valve without draining the whole
system?


Just a suggestion with no idea of its worth....

Could you try turning the valve down at the other end of the rad to
reduce the flow a little - that might prevent the clunking.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk