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Central A/C condensing unit not working - Lennox

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Setting thermostat in the house I am able to feel air blowing, but the condensing unit outside is not working

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Old 07-15-2018, 07:15 PM
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Default Central A/C condensing unit not working - Lennox
Model Number: 10acc03023004   Brand: -other-   Age: More than 10 years   

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Setting thermostat in the house I am able to feel air blowing, but the condensing unit outside is not working (fan not spinning - not "on"). I pulled fuses out and tested them - they are working - continuity. Installed 2005.

This will be a new adventure for me - (have totally pulled apart dishwashers and microwaves and ovens and a little work on furnace -- no a/c experience yet)

What should I look for next? For some reason I am a little intimidated at this one -- even though it looks pretty straight forward..Thanks in advance for the troubleshooting.


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  #2 (permalink)  
Old 07-19-2018, 07:30 AM
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While I was waiting for anyone's input, I continue to investigate the issues. As I said, air was being blown out of the vents. Fuses working, but no sounds coming from the condensing unit outside. I tested the contactor and it did appear to have a "bug" in the contact. I replaced that and when I flipped power back on - I got that distinct humming sound - but no fan spinning. Which leads me to the capacitor. I don't know why I didn't do a visual check on this at an earlier time; but it is a little domed on top and I can now verify that there is power - so I ordered a new capacitor. Unless there is something additionally wrong with the fan motor as well, I think this will solve the issue. Will continue to update. So far only into this for about $35 for both parts and time...
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Old 07-25-2018, 09:31 AM
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Boom Fixed! New capacitor also installed. Cold air. contactor and capacitor replaced both for under $40.
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