On arrival, homeowner stated that the AC went out Sunday morning, but he still had air coming from the supply registers. He turned the system off on the thermostat just in case to prevent further damage. I set the thermostat to COOL mode and went outside; I found the contactor relay engaged but no high voltage going across the set of contacts. Installed a new contactor and restored high voltage power to the system. Checked over the system and verified operation. Everything is working at this time.