Thanks, Pensdown. It's the first time the term's used in the instructions.
Yes, the sensor is fitted. And I can get temperature reading from it through the contoller (as per page 8 ).
Don't seem to be able to get power to the mat through the controller?
I'm using a Timeguard TPT44: http://www.timeguard.com/pdf/instructions/tpt44.pdf
to control a newly installed heating mat.
The timer has been programmed but the flooring has not heated up.
I have re-tested the heating mat, continuity checks ok. As does the sensor.
The input supply...