Hi I'm Brian and I'm here to help!
You may want to try turning off power to the indoor units to interrupt the low voltage system and possibly 'reset' any trouble the line voltage issue may have caused. If the Carrier units are higher end, like an Infinity system, they may be locked out and cycling power to the indoor units should reset them.
If you confirmed line voltage supply to your condensing units, which it sounds like you did, then the problem will be in the 24 volt signal to them or possibly a problem within them such as burnt up contactors from the low supply voltage and degraded electrical branch circuit system. If you turn the thermostats off then back on, and have a helper stand by the units, if your helper hears an audible "click" when the ac units are called to run, that tells you the low voltage control signal is getting to the units. If the click is not heard then the problem could be in the low voltage signal that should be sent outside but is not do to thermostat issues or drain line switch issues. If the signal is making it outside whether you hear the click or not, then there is a problem within the outdoor units like a contactor, time delay relay or unit safety control (high or low pressure cutout or the like).
If you have a volt meter and would like help using it to diagnose the exact problem, I can help with that if you'd like. I would need model numbers of the outdoor units to help with that.
Let me know if you have further questions on this subject. Otherwise, please remember to rate before leaving (3 stars or higher please!). Bonuses are always appreciated! And remember, follow up questions about this topic are free even after rating. Just post a new reply on this same question and I'll be notified. Thanks for allowing me to help and thanks for using Just Answer!