AC Capacitor Fault — Start / Run Capacitor Diagnosis

Check capacitance and physical condition

Check: Measure capacitance (LCR or multimeter cap mode). Within ±6% of rated μF = OK. Bulging/oil leak/burst = replace immediately. Rated voltage per manual. Discharge residual voltage with insulated screwdriver (shock hazard). Located on compressor and outdoor fan motor.

What to do: Cut power, discharge residual voltage across terminals with insulated screwdriver. Measure capacitance (LCR or multimeter cap mode). Within ±6% of rated = OK. Replace immediately if bulging/oil leak/burst. Use same rating (μF, V). After replace, run 5-min test and verify compressor/fan normal operation.