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I don't know how relevant this is , but I've found that if the temperature is SET higher than the current room temperature , then the heating comes on ( which I get  ). Then , provided  the room temperature stays below the SET temperature , the UFH stays on and the UFH floor temperature...

FTR , flooring was done in this order : Plywood UFH mat Screed Ceramic tiles.

I've asked the electrician to check whether the thermostat is set to room or floor sensor but he said he doesn't know how to do that ( ! ). Is there a link I can send him ? ( getting panicky now ! )

If he has set it to room rather than floor , can he switch the sensor to ' floor ? 

If so , can it be rectified ?

OK I'll speak to him again.Thanks very much for your help.

Thanks Sharpend . Yes , this is the one though I have these instructions but still can't resolve it. What I can't get my head around is why the UFH sensor doesn't cut off when it hits the set temp. Why does it continue to climb.?

I really don't know - I simply left him to it. Maybe I need to ask him. He's saying it's a faulty thermostat and it needs replacing but is this likely with a brand new thermostat ? 

We essentially had it installed as an alternative to a CH radiator. If I have to have it on at 35 degrees then it's going to cost me a fortune. I simply wanted to have it on 22 degrees.    Thanks for your advice , it's very much appreciated.

Am I right in thinking that it is correct for the UFH temperature to exceed the set temperature ? I was given to understand that the thermostat controlled the UFH temperature rather than the room temperature. 

1000 w

No. Sorry , I should have made that clear. 

Just to be clear , The UFH is ' Nass Boards Underfloor Heating Mat '

Thanks for your advice. 13.57 today : 1 Room temperature 21 degrees 2 Set temperature 22 degrees 3 UFH temperature 26 degrees 14.38 today  : 1 RT 21.5 2 ST 22 3 UFHT 31.0 I would expect the RT to increase by more than half a degree in 40 minutes.Maybe I'll need to hang on until it hits...

Thanks for your reply. The thermostat display panel shows three readings : 1 Room temperature ( this is usually about 18 - 20 degrees and no more ). 2 The SET temperature for the UFH ( I usually set this at about 22 degrees). 3 The UFH temperature. Prior to switching it on , it's about 15...

Electrician has installed bathroom UFH and used Moesgo BHT - 002 thermostat. When I set the temperature ( using both manual and programmable mode ) so say , 22 degrees , the UFH temperature continues to rise beyond this to mid thirties ( and possibly beyond ). He is uncertain why this is...