New thermostat, compressor stuck on
I just replaced the thermostats in my new house. Within an hour or two of that, I noticed that one of my air conditioner compressors was on even when the thermostat was not calling for cooling. I even cut power to the thermostat, and the compressor stays on. The only way to shut it off is by flipping the breaker for the compressor. From my initial research, it sounds like this is probably a failed contactor. But I am just wondering, the timing seems odd. Is there anything else that could be going on? Could my new thermostat have made the contactor go bad? Is it just a weird coincidence? The air conditioner is pretty old, but until today as far as I know it was working fine.