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What is model on air handler and outdoor unit ? Do you have a meter for troubleshooting?
Do you see a model on label ?
Look beside the lights and see if the words status and fault are shown by leds.Then tell me the codes by status and fault
If the on and 3 are by status that is letting us know no call for ac and then call for ac
If the 7 is the fault code. most likely low on refrigerant or a restriction
This will require a tech onsite to diagnose unless you have refrigerant gauges
Most likely outdoor is shut off due to a pressure switch.Do you have gauges to check charge?
Try turning breakers off to both units and see if it will reset.Then turn back on and call for cool and see if it tries to start at all.
Do you have a volt meter to see if air handler is sending 24v to outdoor unit?