Have HVAC Questions? Ask an HVAC Expert for Answers
what is the model number of your outdoor unit?
Please see page 13 HERE and tell us what the code is
This is an auto reset when pressure rises....lets say you were running with a dirty filter and it ran low pressure....the pressure would then rise and let it try again.
If it is doing it from a dead start, you have lost refrigerant.
And of course that requires a tech visit to leak check, repair, and recharge unit