To troubleshoot a faulty condenser fan capacitor, start by inspecting the capacitor for signs of physical damage, such as cracks, burns, or swelling. Use a multimeter to measure the capacitor’s capacitance and compare it to the manufacturer’s specifications. Check for any signs of overheating, such as burned or melted components. Finally, perform a continuity test to ensure the capacitor is not short-circuited. If the capacitor is faulty, replace it with a new one of the same specifications.