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Discuss UFH Leaks 1 year after installation in the Water Underfloor Heating Installations area at PlumbersForums.net

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Hi - I little insight and guidance would be much appreciated.
My wet UFH was installed over a year ago by a qualified heating engineer, he went through all stages and did the pressure test as well, everything has been working nicely without any issues.
Now here is the unlucky coincidence - I had a leak in the copper pipes running from the boiler upstairs which was fixed by a plumber last week. The night the plumber fixed it, 2 bubbles appeared in the joints of my laminate downstairs, close to where the manifold is.

I don't think it was a coincidence but I am not knowledgeable enough to call the plumber and talk through what happened, and I dont want to offend anyone either by questioning their work. I am thinking, maybe during the pressure testing the manifold got too pressurised and it caused leaks? I know he didn't isolate the system and I am not even sure he was supposed to do that - however surely if the UFH system was pressure tested it should have resisted another pressure test?
We normally switch off the boiler during the night - and now every morning once we switch it on the UFH connections start making a trembling clacking noise.

I don't know what to do or who to call - the heating engineer who installed it (who I suppose will likely point to the plumber who fixed the leak) or the plumber directly but, what to say? I checked the plumber's company and they do not work with UFH so not sure they can even fix it!

What could have happened, any ideas?
We have closed the UFH system for the time being to avoid further damage to the laminate/screed as it has been about 5 days since the leak upstairs was fixed.
 
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