The system is intelligent. It will not allow both A/C units to start simultaneously.
I have had both units set to Cooling and then the Fan to Auto when the problems occurred. Although two of the three times I was turning the A/C on when it had been off.
Here are pictures showing the cooling icon visible meaning the compressors are running but the fan icons are not displayed, which is correct because the fans were in fact not running. The diagnostics page also shows the same thing. I even turned off the cooling but the compressors kept running until I flipped the breakers for them. The 12v reboot fixed the problems
I am also adding a picture showing the condition where the fans were running but the compressors were not turned on when the thermostat was calling for cooling.
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