Question about Heating & Cooling
The humming can be the fan itself or restrictions in ductwork. ducts to small will create excess noise.
Posted on Dec 15, 2009
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Posted on Jan 02, 2017
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Apr 19, 2016 | Heating & Cooling
If it is just the condenser fan that means you have a fan relay that has welded shut. Turn power off to your unit and trace the wires from your condenser fan back into the control panel at the unit. You'll have 3 wires going to it. 2 go to the run capacitor and one goes to the fan relay. The one that goes to the fan relay is the part that needs to be replaced. If you have no fan relay and it goes to the main contractor, half of your main contractor is welded shut and will need to be replaced.
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