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emcinnis 08-18-2011 03:26 PM

Bryant AC unit not working
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I have a Bryant 563C Split-System AC unit that stopped working. The thermostat and blower motor in the attic are working fine. After reading some of the threads I assumed it might be the capacitor. I visually inspected unit it does not have any signs of being bad. However there was a distinct buzzing coming from the Contactor. So my attension shifted to that. The Compressor and Fan motor will not kick on. I had my wife turn the thermostat off and the contactor buzzing of course stoped, when she turned it back on the contactor clicked on and buzzing began. The fan and compressor did not come on, however there was hissing coming from (again assuming), doing a lot of that :(, from somewhere around compressor. I immediately turned the power off to the unit. Any ideas?

biggles 08-18-2011 03:40 PM

hissing could be a freon leak within the condenser...shut the outside power off and remove the panel on the condenser check inside for oil soaked area like it was sprayed....don't know if you have a low pressure safty so the copressor could be running with no freon.....the BUZZING is the armature on that contactor for the fan and compressor...get back on what you smell or see out there

NitroNate 08-18-2011 04:01 PM

the bulging at the top of the capacitor make that the likely culprit. this is a very common failure and very cheap and easy to fix. take it out and look at the specs printed on the side. should be something like 370 or 440 VAC 5+50 uF. take it to a supply shop and buy a replacement for about $15-$25.

make note of which wires are on which terminal at the top, the terminals are labeled COM, HERM and FAN. you may have to clean it off a bit to read them, but take a picture as it stands from the top where you can visibly see which terminal the wires go to. usually brown is FAN, yellow is COM (common) and blue is HERM (compressor).

emcinnis 08-18-2011 04:03 PM

Thanks, so what do you think is causing the Fan and Compressor not to come on? The Contactor or Capacitor?

emcinnis 08-18-2011 04:04 PM

Thanks NitroNate, after I saw the picture I was hoping someone would confirm the same thing I saw.

NitroNate 08-18-2011 04:57 PM

if the dual run capacitor is bad, neither the fan nor the compressor will run. you can test by spinning the fan blade with a stick or something to see if it will spin up and run once you give it a nudge.

emcinnis 08-18-2011 05:26 PM

NitroNate, would that also cause the contactor to stay engaged like it is trying to kick off the fan and compressor?

Marty S. 08-18-2011 05:40 PM

The contactor pulled in and buzzing is just the thermostat calling for cool. No compressor and no fan is due to the bulged capacitor. Buy a new capacitor and you'll be fine. Clean the dirt off that unit too.

emcinnis 08-18-2011 10:12 PM

Thanks Marty, I feel like an idiot when I saw the dust behind the unit. :(

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