AC Capacitor and Contactor Repair
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When the outdoor unit hums but the fan won't spin, or clicks without starting, a failed capacitor or contactor is a common cause. Both parts wear out faster in hot weather. HomeGuide puts a capacitor replacement at $100 to $250 and a contactor at $200 to $450 nationally. Turn the AC off to protect the compressor.
Last reviewed October 19, 2026.
What does a capacitor do?
A capacitor gives the compressor and fan motor the boost they need to start, then helps them run. A weak or failed capacitor can leave the motor humming without starting, or starting slowly and overheating. A bulging or leaking capacitor top is a common visual sign, but only a technician should open the panel; capacitors can hold a dangerous charge.
What does a contactor do?
The contactor is a relay that sends power to the outdoor unit when the thermostat calls for cooling. Pitted or stuck contacts can stop the unit from starting, or keep it running after the thermostat is satisfied. Ants and insects can also get into contactors.
Why do these parts fail in hot weather?
Long run times and high temperatures stress electrical parts. That’s why capacitor and contactor failures often show up on the hottest days of summer.
What do they cost?
HomeGuide national estimates: capacitor $100 to $250 (HomeGuide also cites $250 to $400 in some cases including labor), contactor $200 to $450, diagnostic visit $75 to $200.
When should you call an emergency AC pro in Hemet?
Call for urgent help, and call 911 first where noted, if any of these apply:
- Someone has signs of heat stroke: confusion, slurred speech, fainting, very high body temperature, or hot skin. Call 911 and start cooling them right away.
- The AC is out during a heat wave and someone at home is an older adult, an infant, pregnant, or has a medical condition that heat makes worse.
- The outdoor unit or air handler smells like burning, sparks, or keeps tripping the breaker. Turn the system off at the thermostat and breaker.
- Water is leaking from the air handler into ceilings, walls, or flooring.
- The AC runs but indoor temperatures keep climbing on a hot day.
- You smell gas near a gas furnace or package unit: leave and call 911 or SoCalGas from outside.
If someone shows signs of heat stroke, or you smell gas, call 911 first. Don't wait for a contractor.
Where is capacitor & contactor help available near Hemet?
Requests are taken from Hemet and these nearby communities:
What do people ask about AC repair in Hemet?
Is it safe to keep running an AC with a bad capacitor?
No. A motor that tries to start without a working capacitor overheats, which can damage the compressor or fan motor.
Why is my outdoor fan not spinning?
A failed capacitor or fan motor is the usual cause. Turn the system off until it's repaired.
Can I replace a capacitor myself?
Capacitors store a dangerous electrical charge. Leave it to a technician.
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