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Air conditioner compressor buzzing when air conditioner not running
Outside unit making low constant hum noise, can be heard 4-5 ft away. fan on outside unit blows when thermostat is lowered and ac comes on. Cool air blowing from vents in house when air come on. Wondered what the noise is?
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Not at all uncommon. What you are hearing is a hum from the contactor. Sometimes a simple, firm rap on the outdoor unit where the wires connect will cure it. If not & if it is really annoying, replacing the contactor should cure it. The hum will hurt nothing.
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