stewart warner furnace blower moter


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Old 10-19-08, 08:14 AM
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stewart warner furnace blower moter

blower moter does not come on
 
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Old 10-19-08, 08:20 AM
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stewart warner furnace blower motor

blower motor does not come on
 
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Old 10-19-08, 11:37 AM
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There are several possible reasons, why don't you post a few more details of your system and include the full model number and manufacturer of your furnace and its approximate age.

Is this a belt-driven blower or direct drive? Can you take several pictures and post them?

To post pictures you need to first upload the pictures to a photo hosting site such as photobucket.com or villagephotos.com. and then post the public URLs for the pictures (or album) here. More pictures are always better than fewer. Please have CLEAR pictures and have both close up pictures and ones from a far enough distance that we can see how the various parts are interconnected.
 
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Old 10-19-08, 01:33 PM
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Quick first check when this ever happens: With furnace turned off! go into blower compartment and try to spin the blower wheel and see if it freely spins, and stays spinning for a while from a push. It should, if the bearings are not gummed up.

Another check is to run the furnace - and the time when the blower is supposed to run, listen to hear if the blower motor tries to hum, or if the blower wheel tries to turn a little, but appears locked. You can use some stick-like instrument and try to turn the blower wheel, if you hear a hum, to see if that gets it going at all, or if it moves some but then "locks". You have to push in on the blower door's electrical saftey switch at the same time, or temp. tape it, as that is what completes the electrical circuit to the furnace.

If you have a newer furnace with a circuit board that controls when the fan comes on, you can look on the board for perhaps the word "heat", or "fan", and see if a wire plugged in there goes to the blower. Then, with the blower door closed, use a test meter to see if you have 120 volts at that terminal when the fan should start up. If you have 120 volts come on, then you either have a capacitor issue, a bearing problem, or a motor winding problem (that would then require a new blower motor - a very DIY-able job with some coaching).

Then post back what you have found. Because, yes, there are other things. But this is a good primary start.
 
 

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