The best answer is to get an HVAC tech to check it out. Without knowing anything else, and assuming the compressor starts, runs briefly and then shuts down I'd guess a limit switch (high or low) is being tripped indicating a refrigerant charge problem. It is also possible there is an issue with the temperature sensor. Regardless you'll need a professional to make a proper determination. If it's the refrigerant charge the tech will know how to properly charge the unit and determine if/where there is a leak.
Good luck!
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