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You need to know if your freon charge is correct first- as there is a low pressure switch in the system that will not allow it to turn on if it is too low (under about 50% charge) In addition, this same switch contains a high pressure switch, so if the system is overcharged or heats up too high the system will not turn on either. And you have an ambient temp switch which will not allow the system to turn on under 50 degrees Fahrenheit. SO your first step is to have the refrigerant level evacuated, leak tested, and set to proper level.