We have just moved into a house where a nest thermostat system is installed. As the previous owners took the actual thermostat with them, we have bought our own. However, we cannot get the underfloor heating to turn on - only the radiators turn on when the thermostat is trying to heat the house. In the weeks where we did not have the thermostat and could only turn the heating on and off manually, both the radiators and underfloor heating worked. Is there a setting we need to adjust on the thermostat?
Sorry to hear about the trouble. I wanted to follow up and see if I could be of any help. Since we have limited information on HVAC systems on our end, I would recommend having a HVAC pro come out and take a closer look. They would be able to ensure everything is working properly. Please let me know if you have any questions from here, as I would be happy to take a closer look and assist you further.