My central air outside unit fan humms but won't spin what do you think the problem is

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Originally Posted by Michaelbatten3

My central air outside unit fan humms but won't spin what do you think the problem is

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You have an outside fan that's seized up and needs replaced. Assuming you don't have a tree branch lodged in the unit preventing it rotating.

Two things to check-- Run capacitor for the fan motor is bad and the motor can't start or the motor is bad. You can take the capacitor to a local hvac dealer and they should test it for free, in hope that you might buy the part from them.