Why Is the Fan on My Outdoor AC Unit Not Spinning?
Outdoor AC fan stopped while the unit hums? Usually a capacitor, fan motor or contactor. Why to shut it off now, safe checks, and typical repair costs.
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AC repair in Annandale starts with a $79 trip charge, waived when you approve the repair. Supply ducts in converted lake cabins sweat in crawlspaces on muggy days, and a low charge or a dirty coil leaves the house damp before it feels warm.
Summer around Annandale's lakes is humid, and air conditioners here spend July pulling water out of the air as much as cooling it. A system that's low on charge or has a dirty coil loses that ability first, so the house feels damp before it feels warm. The converted cabins bring their own problems. Supply ducts in a crawlspace sweat when cold air passes through them on a muggy day, dripping onto the soil and soaking the insulation, and an indoor coil in a cramped closet may drain through a pump nobody has looked at in years.
Condensers tucked under big trees near the water collect leaves and seed fluff, which chokes airflow and overheats the compressor. Many lake houses also run ductless heads, and their washable filters and blower wheels need cleaning more often than owners expect, or the head starts dripping and the airflow fades.
Updated October 27, 2026
National averages (HomeGuide, 2026), not our prices: a condensate pump $100–$450, a capacitor $150–$400, a contactor $200–$450. See the capacitor cost guide and refrigerant recharge costs.
Symptom guides: Outdoor fan not spinning · Humming · Leaking water inside · Dirty-socks smell · Signs your AC needs a technician
Usually not. Cold supply ducts running through a humid crawlspace collect condensation the way a cold glass does, and bare or poorly wrapped ducts drip steadily onto the soil, insulation and floor framing. The fixes are insulating and vapor-sealing the ducts, controlling moisture in the crawlspace itself, or both. We also check the charge and airflow, because a coil running too cold makes the sweating worse.
Usually the condensate drain. A ductless head collects water on its coil and drains it through a small hose, and when that hose sags, kinks or fills with slime, water backs up and spills out of the unit. A dirty coil or filter can also freeze the coil, and the melt overflows. We clean the coil and blower wheel, clear the drain and check the charge.
Outdoor AC fan stopped while the unit hums? Usually a capacitor, fan motor or contactor. Why to shut it off now, safe checks, and typical repair costs.
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