Central Ac Unit Blowing Warm Air

by Janet
(Arkansas)

The central ac unit is blowing warm instead of cool. The blower is (obviously) working and the outside fan is running also. But while the fan on the outside unit is running, I can hear something trying to kick on and I'm guessing it is the compressor.


The central ac unit will make a humming noise for a second or two and then it stops. Two years ago the outside unit was only humming - the fan wasn't running - and the technician changed the capacitor.

Could a bad capacitor keep the compressor from kicking on or am I facing the cost of replacing the compressor?

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Aryana NEW
by: Anonymous

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A/C blows Room Temp Air NEW
by: Anonymous

I have a Heil heating/cooling unit. I had the A/C man out to charge the unit. After charge, it worked fine for approx 6-8 hours. Then started blowing room temp air. It will not cool room in day heat. What could be the problem??

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Ac unit NEW
by: Anonymous

I changed the capacitor.and the unit is blowing warm.air please jelp me and of dont know what to do.and.the.temp.on thermostat are not.reading properly

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Central Ac Units Blowing Warm Air (compressor works when manually starting contactor) NEW
by: Jim cardaman

Air handler works fine, also it goes on and off under the control of thermostat.

Compressor was not running. I depressed the test button/switch on the contactor. This caused the compressor to come on. The air then blew cool and continued to cool area. I stopped it at 68 degrees. I replaced the contactor. With the new contactor in place the symptoms are the same as before changing it. Handler works fine, also it goes on and off under the control of thermostat.Compressor was not running. I depressed the test button/switch on the contactor. This caused the compressor to come on and cool

What do I do next? what could problem be and how do I test for it?


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confused about fan in a/c unit NEW
by: Anonymous

yesterday the ac was on but the fan wasnt on and the unit was making a humming noise.today i put ac on and fan was on but only warm air is coming out of vents.now fan isnt on anymore but ac is but still only warm air is coming out.whats the ac problem?

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Airflow problem
by: Dadan

Clog or bend duct work can have the same effect on airflow problem. The first thing I would do is to check for duct work restriction or leak. Where is your air handler unit at?


Dadan

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Cold Upstairs and Warm Downstairs
by: Anonymous

I have a York Model #MA20DN21A. During this summer, the unit will kick on and blow lots of of cold air upstairs, but downstairs get very little airflow. The air that comes out of the downstairs vents is about the same temperature so I have ruled out coil freeze up. I change the filters every month on the 1st.

Could this be a clog or air restriction in the main duct that leads down to the downstairs vents?

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central unit
by: Ann

I went to turn the theromstat on cool. the temperature did not got down. It was blowing out warm air and not much at that. I went outside and the unit was humming like it was stuck. What could be wrong.

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Thanks, again!
by: Janet

Thankfully it was just the capacitor. Not nearly as expensive as replacing the compressor! Thank you very much for your input.

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Central Ac Is Warm
by: Dadan

What I meant was the internal part of the compressor will not rotate. Whenever a compressor stuck, you will need something to boost it up (I’m presume your central ac compressor is stuck). It could just be a bad capacitor.

Dadan

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Thanks Dadan
by: Janet

Can you clarify? If the compressor is "stuck" does that mean it's not working?

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Central Ac Units Blowing Warm Air
by: Dadan

Yes, a bad capacitor can prevent the compressor from running. The humming sound could also mean the compressor is stuck. And I do hope it’s the capacitor.

Regards,

Dadan

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