Safety First: Power Down and Verify Safety is the non-negotiable first step in any electrical work. Take the new capacitor and connect the wires exactly as they were on the old one.
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Only proceed when you are 100% certain the power is dead. Simply turning the thermostat to "Off" is insufficient.
Place one probe on the ground wire and the other on each terminal (L1, L2, L3 if applicable). You must replace it with a new unit that matches these specifications exactly, typically 5μF to 7μF for outdoor units and 3-5μF for fan circuits.
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Wiring a capacitor for HVAC applications is a fundamental skill for technicians and a common point of failure for homeowners. Tighten the screws firmly to ensure good conductivity and to prevent arcing.
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