re: All 3 outside AC units not running *update pg 3!

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Certainly those three units aren't wired from one breaker. But, it sounds like something in common to all 3 are causing the issue. I assume they all 3 cut off at the same time?

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Yes, that sounds strange if all three HVACs are on the same breaker, I believe by code each individual high amp draw appliance Is supposed to be on a separate breaker. If they are all on the same breaker I would think it would have to be breaker, loose wiring connection to the breaker or something other electrical issue in the main panel. Based on your description, I’d call an electrician first before HVAC tech unless you can get a HVAC tech who is a licensed electrician as well - some are.

Anyway, when you get the problem resolved I hope you’ll report back and let us know what the issue was.

ETA: OK i see your photo - single 100 amp breaker for AC. I’d call an electrician. Electrician’s handle electrical issues upline of the outside HVAC disconnect(s).