Thermostatscan be a little tricky but this is a pretty good plain answer what.
Wall mounted thermostat dial seems loose.
If everything looks ok then check the battery in your thermostat if it is a digital model.
It was dialed up high to heat an empty house this winter for three days so a new rug being installend on a cold basement floor would warm up and bubbles in t.
It should come off easily.
Often when installing a thermostat people have no or little idea of what to do.
If you see dust being blown out this may have been your problem.
If it is a loose wire turn the ac unit off by switching the breaker.
We have a round honeywell wall thermostat.
When there is a signal for heat the dial seems to get stuck and hums until i gently mov.
Change your wall thermostat batteries once a year or when the low battery indicator appears on the digital display.
Get a can of compressed air the kind used to clean computer keyboards and blow it out.
The other day i noticed that my 2nd gen nest thermostat is coming loose from the wall mount.
Turn the thermostat off first and remove it from the wall base.
Pull the wall thermostat housing off of its wall mount plate.
Basically it seems as though the two tabs at the top of the display aren t clicking into place.