Originally Posted by bjrscj
The furnace works and blows air when set to heat. However, the furnace (indoor unit) is not blowing air when set to cool.
The outdoor unit is making a soft hum noise from the rear. It sounds like it's coming from the area where the wires enter the unit. The fan blades do not spin at all.
Thanks for your help.
Not a problem, we all live for this around here.
Just like in my previous post concerning the inside blower, the same applies to the outside. There is a run capacitor and 9 out of 10 times it will fail long before the motor will. Turn the breaker to the outside unit off, remove service door and look at the cap. Does it looked round on top or is there any oily jelly like residue all over it, both rounded on top and oily? Bad cap.
Also with power OFF at the BREAKER, try and spin the fan blades with the use of a long screwdriver or a straightened out metal clothes hanger, something so you can turn the blades. Does it spin freely?
Also, with the power ON to the entire system and the stat set on cool yet the fan not spinning, is the lid of the condenser where the motor is hanging from getting abnormally hot to the touch? These are all tell tale signs as to what to expect.
The humming noise you hear, if inside the service door of the condenser where the wires go into, is nothing more than the contactor being pulled in during a call for cool. It is there regarldess if it indeed is the contactor (some hum, some don't but all work the exact same), you just can't hear it with the unit on.