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Discussion Starter · #1 ·
Yesterday my A/C stopped blowing air. As far as I can tell, everything inside seems to be working fine, so I believe it's an issue with the outside unit. The fan and compressor wont run at all. I did hear a slight hum when I was out there, but that's it. I pulled the electrical access panel off to check inside there.
I'm thinking it's the capacitor. The top seems to be bulging and as I understand, it should be flat. Anyone know if this could be my problem?

Thanks
 

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The capacitor is bad for sure, fan motor may or may not survived.

If the contactor is pulling in and you've got power (240v) being applied change the cap.

With a bad cap the motors draw excess current when trying to start, normally the internal protection in shuts the motor to prevent damage but there's a chance fuses in the disconnect got blown, if there are fuses.

Could be the fan side or the compressor side or both that's bad -> check for power (fuse/breaker open?), change the cap and see if it runs.
 

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Discussion Starter · #4 ·
Thanks for the quick reply. The unit is making some kind low hum, but that's it. I happened to put my hand on the top of the cover where the fan is mounted and it was pretty hot, so hopefully that's not a bad sign. I don't have a voltage tester at the moment. I'm trying to decide if I should just replace the cap and see what happens or just call somebody to come out tomorrow morning. If it wasn't 80 degrees in my house right now, I would just try replacing it. Unfortunately, I'm going to have an unhappy wife if I don't get this fixed soon.
 

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Change it and if u want to do troubleshooting beyond that get yourself a meter, cheaper than calling someone else if u have electrical knowledge.

Leave the machine off for a few hours to cool down - if u're lucky no damaged occurred.

If u give the fan motor as spin (with a stick or applying water pressure from hose) with power applied and a bad cap it should start.
 

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Discussion Starter · #6 ·
Just an update. I ended up just calling someone out. It was the capacitor, as you said, and everything works now. It's a shame that I could have fixed it myself, but I just didn't have the time to mess with it if the capacitor wasn't the only problem. If the circumstances had been different, I would have just tried it. The problem was that if I couldn't fix it today, then I would have to wait until Tuesday to get someone out here unless I wanted to pay weekend and holiday rates. Thanks for all of your help.
 
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