Stopped heating the underfloor when the sensor is working

Alexander asks:
Good afternoon. The question is as follows. The apartment has a warm floor, it worked for a year without complaints, it was turned off for the summer, after switching on the temperature on the sensor does not rise. I changed the sensor to a new one, the situation has not changed. The sensor works, but floor heating does not occur; accordingly, the temperature on the sensor does not change. There were no floods, closures and other things. What could be the problem??? Thank.
The answer to the question:
Hello! Is the underfloor heating electric? Is voltage coming from the controller to the warm floor? Check it out first. If it arrives, but the floor does not heat up, either a break in the line from the controller to the floor, or in the floor itself (cable or film?). What does “sensor work” mean? That is, shows the correct temperature?
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