no air from vent - but blower is on

psilversmithJanuary 26, 2013

I checked the bedroom register from my HVAC and noted there was NO air flowing out. No wonder it is colder than usual in here. The outside heat pump fan and the attic blower fan are working normally. No reason for the duct to blocked. Any thoughts greatly appreciated.

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mike_home

Go in the attic and trace the duct feeding that register. It may be disconnected or have a big hole in it.

    Bookmark   January 26, 2013 at 2:48PM
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hvacajun

Or you have a damper that has malfunctioned. Then again, you could be iced up if you have a heat pump this time of year.

    Bookmark   January 26, 2013 at 9:58PM
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psilversmith

Thanks for the logical ideas. I did check the ducts in the attic - as far as I could follow the one to the bedroom, all looked OK- no disconnects, no holes. It's crazy, I know, that's why I'm looking for ideas. Thanks again.

    Bookmark   January 27, 2013 at 9:30AM
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mike_home

I assume this register is in the ceiling. Can you remove the register grille? Stick your hand inside to feel for any blockage.

If there is no blockage and your air handler is working properly then the air must be going somewhere else.

    Bookmark   January 28, 2013 at 8:53AM
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ionized_gw

How well insulated is the duct? If not exceptionally well, it should feel warm if the heat has been running for a while. Compare the temp to the other ducts. If you want to get some quantitative information, IR, "point and shoot", thermometers have become really inexpensive. They make for great kitchen tools when you are not measuring duct temperatures.

    Bookmark   January 28, 2013 at 11:47AM
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psilversmith

Heat register is cold (room temp) to the touch. I reached my hand to my elbow, all clear. This is really nuts. Thank you for the thoughts.

    Bookmark   January 30, 2013 at 9:02PM
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ionized_gw

I was thinking about the ducts in the attic leading to the register, are they warm to the touch?

    Bookmark   January 31, 2013 at 10:28AM
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psilversmith

Attic ducts are insulated, but do feel warmish.
Thanks.

    Bookmark   February 4, 2013 at 8:40PM
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