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Old 01-15-2012, 11:59 AM   #1
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Furnace motor is running but no air out


I have a very old (~1989) gas furnace at home. When it works, first, I can hear motor starts running but no air out for about 1 min. After 1 min, the air (eventually hot) comes out.

This morning, the motor is still running (I can still hear it), but it never blows. Can you please advice what could be the problem? Do you think it's serious that I should just replace the furnace? I will call a HVAC pros next week but it's cold so if I can fix it myself that would be great.

Thanks.

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Old 01-15-2012, 12:34 PM   #2
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Furnace motor is running but no air out


post the make and model of the furnace and some pics of the motor. does it have a belt?

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Old 01-15-2012, 12:37 PM   #3
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Furnace motor is running but no air out


Loose belt, broken belt, loose screw on the squarrel cage shaft.
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Old 01-15-2012, 12:43 PM   #4
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Furnace motor is running but no air out


Sounds like a clogged port on the inducer pressure switch hose nipple or a broken ignitor.
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Old 01-15-2012, 12:47 PM   #5
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Furnace motor is running but no air out


Where do I find the belt? Do I have to remove the motor from the furnace?


Here is the images.


http://imageshack.us/photo/my-images/827/photo3hhs.jpg/
http://imageshack.us/photo/my-images/23/photo2tm.jpg/
http://imageshack.us/photo/my-images/209/photo1gjy.jpg/
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Old 01-15-2012, 12:52 PM   #6
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Furnace motor is running but no air out


Are you sure you're hearing the actual blower motor or is it the inducer motor?
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Old 01-15-2012, 01:02 PM   #7
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Furnace motor is running but no air out


Quote:
Originally Posted by Doc Holliday View Post
Are you sure you're hearing the actual blower motor or is it the inducer motor?
I think what I meant was the inducer motor.

http://imageshack.us/photo/my-images/209/photo1gjy.jpg/

I can see it spinning.

I tried to see if the exhaust pipe is hot, but it is not.

Sorry, if I made it confusing.
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Old 01-15-2012, 01:33 PM   #8
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Furnace motor is running but no air out


Take the rubber hose off the inducer then clear out that little metal nipple that it connects to.
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Old 01-15-2012, 01:51 PM   #9
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Furnace motor is running but no air out


Quote:
Originally Posted by Marty S. View Post
Take the rubber hose off the inducer then clear out that little metal nipple that it connects to.
Thanks Marty.

I did it. The metal nipple is pretty clean actually. Do I have to clean deep inside the nipple?

Normally, after I turned the heater on, it would be another "click" after 1-2 mins and it will start to suck/blow the air out.
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Old 01-15-2012, 01:56 PM   #10
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Furnace motor is running but no air out


ram a paper clip 1-2" inside that nipple or a small drill bit. also disconnect that hose from the pressure switch and blow it out.
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Old 01-15-2012, 08:54 PM   #11
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Furnace motor is running but no air out


Quote:
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ram a paper clip 1-2" inside that nipple or a small drill bit. also disconnect that hose from the pressure switch and blow it out.
Marty & Yuri -- Thanks a lot. That solves the problem!

One thing I noticed was that this morning when it didn't work, I don't hear ignitor. Now, I can hear it clearly.
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Old 01-15-2012, 09:29 PM   #12
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Furnace motor is running but no air out


The pressure switch closes via the inducer motor which then allows rest of the heating sequence to begin, the ignitor glows and then the gas valve opens, flames and lastly blower turns on.

No pressure switch, no heating.

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