I assume you have Dometic Duo-Therm 5 button thermostats?
These are powered through the RJ-11 (telephone cord) from the AC units. They also have a small on-off button on the bottom.
Do you have two thermostats and are both off?
Regardless, check your circuit breakers. Find the AC circuit breaker and cycle it. It takes 5 min for the system to reset after cycling the breaker.
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