Dispatched due to thermostat indicating an “Open Start Circuit” fault on the air conditioning system. Upon arrival, performed a full diagnostic of the outdoor condenser unit. During inspection, found frayed and deteriorated low-voltage wiring outside the condenser cabinet. This caused an intermittent short and disruption in the start circuit, preventing the system from properly energizing the compressor. Further testing of the electrical components revealed the compressor start capacitor had failed and was no longer within manufacturer specifications. A weak or failed start capacitor prevents the compressor from receiving the proper phase shift and torque required at startup, which can result in hard starts, nuisance lockouts, overheating, and potential long-term compressor damage. Repaired the damaged wiring to eliminate the short and replaced the failed start capacitor. After repairs were completed, tested system operation. The condenser started properly, amperage readings were wi