Upon arrival thermostat was on and calling for cool but system was not cooling. Thermostat set at 74 home was 81 Because of system powered and calling for cooling I went directly to condenser unit Outdoor condenser unit not on so I removed panel and checked for high voltage and had nothing System had a core sense installed and had Trip/Lock sensor on Checked disconnect for high voltage issues and noticed disconnect breaker was tripped. Checked all wires to see if bad connection or rub out and did not find any issues. System also has soft start installed so I checked wiring of soft start and it is correct. Spoke to homeowner about breaker trip and after resetting breaker I found no other issues. Collected service fee and left system on cool Thermostat dropped to 78 upon departure and continuing to drop.