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Diagnose why your compressor won't start, hums, trips the breaker, or runs but doesn't cool. Step-by-step with part recommendations.
The #1 reason an AC compressor won't start is a failed run capacitor — it accounts for roughly 60-70% of "compressor won't start" service calls. The second most common is a bad contactor. Before spending $2,000-$3,500 on a compressor, always check these $15-$50 parts first.
If the compressor hums but won't start, the capacitor is almost certainly the problem. The hum means the motor is getting power but can't overcome starting torque. A new capacitor or hard start kit solves this 90% of the time.
35,000+ OEM parts, same-day shipping.