If you see dust being blown out this may have been your problem.
Wall mounted thermostat dial seems loose.
Turn the thermostat off first and remove it from the wall base.
Get a can of compressed air the kind used to clean computer keyboards and blow it out.
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.
These include a tripped breaker a loose connection a dirty thermostat or a bad battery in your digital thermostat.
Thermostatscan be a little tricky but this is a pretty good plain answer what.
It should come off easily.
If it is a loose wire turn the ac unit off by switching the breaker.
I tried pushing just about as hard as i felt comfortable pushing but it still seems to sit crooked and feels very loose.
Pull the wall thermostat housing off of its wall mount plate.
When there is a signal for heat the dial seems to get stuck and hums until i gently mov.
The first thing you will want to do is to check the electrical panel to see if any breakers are off or tripped.
The other day i noticed that my 2nd gen nest thermostat is coming loose from the wall mount.
Change your wall thermostat batteries once a year or when the low battery indicator appears on the digital display.
We have a round honeywell wall thermostat.