A/C unit - It is a Lennox HS9-511-4P. The Control Relay is clicking when the A/C is turned on at the tstat but the Contactor is not pulling in. I have tested the fuses and they are fine. I have toggled the breakers. If I manually push-in the contactor, the compressor and fan work and I get cold air blowing in the house. The contactor coil is not doing it's thing I guess. What is my next step in identifying the culprit.

You might have to check the coil voltage with a meter to determine that you have 24 volts.
Lennox units have a manual reset high pressure switch , it is a red button that you push in it is in the out door unit, good luck.

Ahhh! That cool air feels soooo good. Thank you a TON!!

NOW you still have a problem, why did it go off on this switch? The condenser coil is probably dirty and tomorrow if you take a water hose to it you will probably be OK. Mike