Service diagnostic found that the upstairs and downstairs systems were not running. I went over the upstairs system and found that the batteries on the thermostat had died and the thermostat was not operating. I replaced the batteries and the upstairs system is now operational. For the downstairs system, I found that the capacitor on the condenser unit had failed. Options for repair were presented to the homeowners. The Runkles chose to have the capacitor replaced today. I replaced the capacitor and the system is now operational. I function tested both systems and both systems were running at the completion of service.