What to do if underfloor heating stops working?

Either dig into the grout lines (if wide enough) or dig up a tile so you can position it adjacent to the underfloor heating mat. Try resetting the clock to the factory settings to check whether your thermostat is faulty. If the problem persists, you may need to change the thermostat.

How do you reset underfloor heating?

Below are the instructions on how to reset the controller: Keep the Mode and i buttons on the underfloor heating controller pressed simultaneously for at least 10 seconds. After 4 seconds the controller changes over to test mode. Continue to keep the button pressed until the LED flashes yellow.