I just returned from a trip, and when I turned on my five split A/C units to cool down the house, they worked fine for about 30 minutes and then all stopped at the same time. I'm thinking we might have blown a fuse, but I've already flipped all the breakers—not just the ones for the A/C units, but every single one. Despite this, the units are still unresponsive. Any suggestions on what might be happening?
3 Answers
If you have multiple outdoor units, it could be something like a faulty contactor in one of the condensing units. They're pretty cheap—around $30 to $40—and fairly easy to replace. Definitely worth looking into!
It could be related to how your units are wired. Are they hard wired or plugged into outlets? Hard-wired systems can sometimes have issues if connected incorrectly. If they are hard wired, double-check your connections.
You might not want to assume the breaker is the issue immediately. If they all died at once, it could be a problem with the pressure in the refrigerant line or something on the main unit. Check that first to be safe!