Hi all, sorry for the late reply, i wanted to ignore it over Christmas! But i am back to figure out this issue!
So in response, i did check out of the box and everything was okay.
It appears to be where one of the wires (heating) have been nicked ever so slightly.
Now i can not access the floor, as it has 2 layers of self level, underlay and laminate on top, so no way of fixing the issue directly.
I have, however, had an idea, which I would like an opinion on.
This may be controversial...
Now the issue is only between Live and Earth, as we have established.
So do i actually need to connect the Earth from the mat to the thermostat?
I understand that earth is required for safety/fault conditions, but the whole mat is under self level, with no way of getting to it (unless drilling through the floor).
I know there will be some unhappy people for even considering this, but I can not see any reason to why not connecting the earth to the mat would cause any issues UNLESS i was to drill through into a wire for instance.
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Hopefully it’s nicked in the cold tail between floor and wall so should be a reasonably easy fix
unfortunately not, it was the heating wire that was nicked....