Genuine Fujitsu 9704268020 Outdoor Capacitor 2700UF 450VAC is a high-value capacitor in the outdoor unit, keeping the supply to the electronics steady. A failed capacitor leaves that supply unsteady, so the unit can cut out or stop with a fault. A genuine Fujitsu part is made to the same design as the original, so it goes back in the way the outdoor unit was built.