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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Underfloor heating vibrating https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1621238161 Message started by RBlue68 on May 17^th, 2021, 8:56am

Title: Underfloor heating vibrating
Post by RBlue68 on May 17^th, 2021, 8:56am

Hi there , looking for some help with underfloor heating . I have just moved into my new house and the underfloor heating is constantly knocking . Only happens on one zone , when that zone is off it’s all fine . Any suggestions on what to do ? I have listened to the 6 pipes and it’s impossible to tell which one it is that’s knocking .

Title: Re: Underfloor heating vibrating
Post by thescruff on May 17^th, 2021, 10:17pm

Almost certainly the zone valve, how old is the system?

A possible alternative could be a thermostatic valve connected the wrong way round.

As much information as possible please, ideally with some pics showing the manifolds and zone valves