Most ptacs I've worked on always seemed to be the control board. The relays attached to the control board(circuit board) fail quite often. You should be able to hear the compressor cycle on during cool or heat. If the comp is operating, check for ice on the indoor and outdoor coils. And the air filter. If this don't help you'll need to call for help.
Does the unit cool ok? If yes, you likely have a problem with reversing valve. If no, likely a refrigerant problem.
If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79
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