Shut off the equipment, your likely to short something with bare wire touching.
Do you have separate systems for heating and cooling? Why is there 2 bundles of conductors running to that one thermostat?
So I was replacing a thermostat... very easy job... until I pulled too hard on the wire in the wall and pulled out a good length of it. I finished wiring in the thermostat and turn the power back on and the thermostat doesn’t work. I triple checked my wiring is right, but it’s not turning on. I went in the crawl space and found the wire but it was still secured to a support beam so it wasn’t unplugged... not sure what to do. The old thermostat doesn’t work now either. There seems to be an old hvac connection that was hidden in the wall? Or maybe it’s supposed to connect to this. Not sure?
If the breaker failed it would have to be replaced.
This is not something I’d suggest DIYing unless your very comfortable working with live high voltage.
But you’ll have to troubleshoot the issue first to determine what’s wrong.
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