It sounds like it could be a capacitor failure. That is a device used to help start the motor. It bolts in place and is easily replaceable. Depending on costs in your area, it is probably about a $150-$250 repair.
These kinds of failures always occur when you need your AC.
Bob
From: DoIt_Yourself@yahoogroups.com [mailto:DoIt_Yourself@yahoogroups.com] On Behalf Of Mike
Sent: Saturday, July 06, 2013 1:31 AM
To: DoIt_Yourself@yahoogroups.com
Subject: [DIY] Re: HVAC Question
Some more info on this -- the fan will only run AFTER the AC kicks on. If I shut the AC off, the fan will give the same low hum sound.
Also, it does seem to take about 1-2 minutes after the AC kicks on to feel cool air coming out of the vent.
--- In DoIt_Yourself@yahoogroups.com, "Mike" <bigmikechen@...> wrote:
>
> Our AC quit on us this afternoon, but then came back to life in the evening. When it died (or I suppose, fell into a coma), it made a sputtering sound, then stopped.
>
> I went back to the thermostat and the Auto obviously didn't bring up anything. Then I turned just the fan on, and rather than hear the usual fan noises, I heard just a low electrical hum.
>
> I reset the outer unit's breakers, then turned off the thermostat. 3 hours later, everything's running normal. Just to be safe, I also changed out the thermostat's batteries even though it didn't show a Low Battery warning.
>
> Could this have just been an overuse/overheat given the recent heat wave in our area? Or does this seem like a symptom of something else?
>
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