I'm having an ongoing issue with the heated floors in my apartment, which are controlled by the following thermostat: Honeywell Aube Non-Programmable Thermostat 240V DPST (TH114-A-240D-B).

The thermostat never actually stops heating. That is to say, if I set the thermostat to 20.5 degrees (C), it'll just keep heating, regardless of what temperature the floors and apartment reach. It clearly registers that the temperature is rising, far beyond the set temperature.

Here's a quick sample video. Note how the thermostat correctly indicates that it's an insanely hot 23.5 degrees, even though the thermostat had been set consistently at 20.5 for hours.

I understand the theory of a thermostat overshooting its target, in the name of oscillation. But regardless of the many combinations and strategies I've tried over the past months, it seems like this system will never actually stop heating, as long as it's turned on.

Is this expected behavior for such a unit?

(Side note: You may say this is something I should talk to my landlord about. Unfortunately, my landlord is - shall we say - less than awesome.)

Chris