When a residential HVAC dual-run capacitor fails completely, the electrical phase shift required to jumpstart the compressor and fan motors is lost, causing an immediate halt to climate control operations. The immediate symptom is that your outdoor condensing unit or indoor blower will emit a loud, rhythmic humming sound as electrical current flows into the stalled motor windings without creating rotational torque. Within moments, the motor will overheat, triggering internal thermal overload switches or tripping your main circuit breaker to prevent a fire. The system will fail to produce any cooling or heating, leaving your home uncomfortable. You can troubleshoot by turning off power and inspecting the unit. You can verify that a capacitor failure occurred when testing confirms low microfarad output or visual bulging, requiring immediate replacement.
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