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You need to check the condenser fan and compressor to see if they are running. Check any fuses or breakers for them. If the breakers/fuses are good then check the contactor. If that's ok the check the capacitor(s) for them. Let me know what you find.
Remove all covers and look down with them removed and see if the coil drain pan has a stopped up exit where the water drains out and into the rear of the AC unit.
If the unit is off level it could cause a draining problem too.
The click that you are hearing is the relay control board in the rooftop unit. This means that you are getting 12V to the board. It sounds like you are not getting 120V to the AC unit. Check the breakers in the breaker panel to make sure they are OK. If they are fine, then turn off the AC for 5 to 10 minutes and try again. There is a thermal protection device in the unit that prevents you from turning it right back on after a shut down. Try putting the thermostat to fan only operation. If the fan does not come on in fan only mode, then you have thrown a breaker.
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