Hi,

There could be a potential for there to be one of a couple of different issues. Compressor could be shutting down on overload due to improper air flow. You will want to pull kickplate off from under doors and check condenser coils to make sure that they are clean. Once you make sure that the condenser coils are clean, plug unit back in and see if the unit restarts after it has had time to cool down. This unit has an inverter (part #AP4308835) that controls the compressor rather than a start relay. It is possible that the inverter could be faulty or burnt out. It could also be an indication that the compressor rotor could be locked up.