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The AmRad TURBO200 Universal Capacitor Inside your air conditioner's outdoor unit are vital electrical components that help it run. One of the most important—and one of the most common parts to fail—is the HVAC run capacitor. If your AC fan is humming but not spinning, or the compressor won't kick on, a failed capacitor is the likely culprit. What is a Run Capacitor? Think of a run capacitor as a small, temporary battery. It provides the jolt of energy needed to start the powerful fa …