View Full Version : Why will my home a/c not come on
christy2499
Aug 7, 2010, 09:25 AM
First off this is a sears unit digital thermostat, 5 ton unit I think. Turn a/c on it hums but no fan comes on. The relay kicks on but after that I am lost.
wmproop
Aug 7, 2010, 10:28 AM
Possible bad capicitor
Look at it see if the top is buldged up,should be flat not poped up
christy2499
Aug 7, 2010, 11:22 AM
Nothing burnt or out of round or anything
wmproop
Aug 7, 2010, 12:06 PM
You may not have high voltage to the unit, did you check breakers?
Do you have a multimeter? The contactor may be what you hear humming