This is called a heat pump where the Reversing valve switches the flow of freon in the opposite direction.If you have the stat set for cooling, you need to go out side to the condensing unit to see if it is on.If its not running, there is an elect. box mounted near unit. You could have a blown fuse.Change both and see if it comes on. Check the breaker also to see if it may have tripped.The indoor unit will run without the outdoor unit running. If it was running when you went out, the fan should be running. Listen closely where the copper lines enter to see if you can hear the compressor operating. You cant mistake the humming sound. If all is running, it could be a freon problem, or if the fan is on and the compressor is not, you could have a open Run cap?. It could be several things, but i would check the things I have noted and we can go from there. I hope this takes care of you're problem, and please feel free to let me know. I am hear to help you.
Good Luck,
Shastalaker7
PS There is a sequence of operation on all units, and to be a service Tech, you have to know this. Just remember, if the outdoor unit isn't running, then you will not have heat or cooling.
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