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Low air volume coming from supply registers. Checked filter. Checked charge, 40 low/250 high Checked duct, no leaks or breaks. blower turning.

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You may also have a bad logic board that controls the blower motor (ramping up/down speed) or a hole in the duct work that is blowing the cold air elsewhere.

At the attic unit, see if you can tell if the blower sounds like it is pushing a lot of air If not, only a professional can check motor and logic control function.

Also check at your supply registers for an appropriate drop in temperature from your erturn registers (20 degree drop or so). If one supply is not getting that drop, then you may have a detached duct or hole.

Posted on May 21, 2009

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Could possibly have a bad blower motor or on the brinks of one. check the run amps of the motor make sure its doing what it should. if not may need new bloer motor

Posted on Apr 22, 2009

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4. Fan speed may be wrong on blower. Put on HIGH.
5. Duct work may be apart. Check duct work and correct if needed. Note: If you have asbestos duct work do not repair. Call a qualified repair company.
I hope I have helped.
Terry

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