It sounds like you pressed a reset button on the outside unit and the unit began working again, is that correct?
That happens if you turn the AC on in the spring without removing its weather cover if you had on it.... if you had no weather cover protecting the outside unit in the winter..... then the condenser
needs cleaning... that is the aluminum finned heat exchanger
that surrounds the unit on 2 or 3 sides.
To clean that, go to Lowes or Home Depot or any large hardware store and ask for 'foam coil cleaner' and use that to clean the coil.
I am posting two video's below, copy/paste each one to your browser to view them. this will give you an overview of the entire situation.
If you do not want to do this yourself, tell me which direction you are from the center of the nearest city and I will located a few well rated companies that will do the job for you.
We are on the honor system here. Please remember to rate my service before you leave today. If you need anything else, just let me know. You can continue asking follow-up questions at no additional charge.