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Service call that the Outdoor Unit was not working and then after resetting the indoor Breaker the unit started working again. Upon arrival system was running and outdoor unit was in operation. Proceeded to Air Handler in Attic to diagnose. Inspected wiring and settings of system. Measured Supply and Return Air Temperature readings. Proceeded to the outdoor unit and measured refrigerant charge on system. Inspected Wiring at outdoor unit and tested dual capacitor. Found core sense was flashing a 4 - Yellow Flash Code indicating possible Low Line Voltage. Removed cover plate from disconnect box and found one of the line voltage wires in the disconnect box was very loose and not making good contact. Tightened wire connection and checked other connections. With this line wire not making good contact in the disconnect it would have caused the unit to shut down intermittently. Put system back in operation.