Have two A/C units one primary come on, and the second one come either by lower the temp or if the first unit is not maintaining the temp in the house. Also, I can switch the the units so either one can be the primary. With that said, I try raise the temp gauge to the primary unit would shut off, and it Didn't. I try using switch to shut off the unit and it didn't. So next step switch the second unit to be the primary, and shut off the circuit breaker on the first unit, and everything is working.
I am guessing that the relay in the first unit not working. My question the relay something I can replace? Not sure where it is on the A/C unit. I don't remember what brand it is at the moment. I will go out and look in the morning.