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Re: This is a duo derm roof top air conditioner, possible...
If the compressor is not even trying to start you have an electrical problem in the circuit for the compressor. The thermostat could be open and not supplying power to the compressor or the thermal overload device could be open.
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Not sure where your located, so check that unit didn't freeze up on you. Make sure evaporator and condenser coils/fins are clean and run on fan only to aid in thawing them out. Once you see condensation running off roof good, try using cool again and see what happens. When they freeze up, airflow gets restricted through unit. The outside fan and blower wheel for forced air inside are attached to same motor, so if fan is working, blower wheel should be turning as well unless it is broken, or allen key has come loose on clamp around center of blower wheel. Other possibility is that the blower wheel is turning but forced air ducts have blockage at inlet, which will require letting ceiling assembly down to inspect, or removing cover on roof and screws at front evaporator and opening it up. Make sure power is off during inspection.
Trace the wires from the compressor back to where they come from. They should be coming from a contactor or from the circuit board. It's possible the relay is built into the circuit board (it will look like a little black box on the board. Let me know what you find.