If you don't have 120 volts at the power connections at the unit, you have an open fuse or wire someplace between the breaker and the unit.
SOURCE: Duo Therm compressor tries to start and kicks out
I don't think these little units have a start capacitor but what I would do is check that the on/off switch wires to make sure they aren't loose. Also check the wires to the compressor for loose wires as well. It is possible that these are the first signs that the compressor is about to fail. They also can act up some when they haven't been used for awhile and then you try and start them up. Try running the unit for a few hours without asking it to cycle. It might just be a sticky valve.
SOURCE: duo therm roof top a/c
Sounds like 1 of 3. Blower motor capacitor, relay or thermostat. Try to run fan only if that is an option and see.
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