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I agree with, it sounds like the mat was damaged during the installation of the floor covering (tiles) and damp has created an earth fault path. If the installer didn't follow the manufacture's instructions and laid the mat incorrectly then its likely any warranty will be void. Some mats are repairable, but looking at the design of the mats I doubt these are repairable. They look very susceptible to damage, a carless tiler could easily nick the mat with their trowel. Especially if it has been incorrectly/poorly laid. I don't see an easy solution to this, to guarantee a fix. Its looking like tiles up and start again at minimum the section where the fault is.
 
A long shot idea - if it's wooden flooring is there a nail through the insulation of a cable at some point along the edge against the skirting board? How to find - IR test to each nail head?
 
A long shot idea - if it's wooden flooring is there a nail through the insulation of a cable at some point along the edge against the skirting board? How to find - IR test to each nail head?
I doubt that, I have never seen a floor layer nail a wooden floor yet.glued and knocked in to position
if he did nail it, they call it secret nailing where you can not see the nail.
 
Its a wooden floor and the mat is simply laid beneath it.
A floating laminate, or a tongue & groove solid wood? The solid wood tends to be glued and is generally more expensive and occasionally nailed, (which I doubt the floor fitter would be dumb enough to do this considering UFH is installed, or would he?).
Anyhow if the UFH installer is happy to come and sort it, that's just the job.
What will be very interesting is if you can find out exactly what the cause of the fault was and let us all know!! Cheers!
 
Hi - I've not used that foil, it looks fragile for flooring installer use (sorry to be blunt). My 20p is one of "the 3" has been punctured and is in contact with the original concrete floor (?), but you'd think IR would be lower ... And the buzzing is the mat vibrating in the space between new flooring and original floor (not properly secured?).
Customer response to 'buzzing'? I know I'd just say fix it please.
 
The foil type underfloor heating is a terrible idea in my opinion, I’ve seen it once before and I didn’t like it at all.

It is basically constructed like a rear window de-mister on a car, there’s a L and N bussbar formed by a copper strip running along each side of it with heating elements between them. All this is sandwiched between two thin flimsy bits of plastic.
 

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