I forgot to mention that the advice I have given is just an exercise purely to confirm that the system functions and will get to a temperature.So we isolated the mat which is on the timber floor side, disconnected the sensor which only left the mat in the concrete floor side connected for approx 6 hours.
6 hours later the floor is barely warm! you can just about feel some warmth on the tiles
Should i leave it on longer? If so is there any risk of damage, overheating etc given that the floor sensor has been disconnected
The thermostat doesn't have an air sensor
Because the sensor has been disconnected there is no over temp protection so don't leave the system running constantly unmonitored otherwise there is a risk of cooking the underfloor system.