Blower Motor Overheats


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Old 12-26-08, 09:29 AM
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Question Blower Motor Overheats

Hi,

I have a Comfortmaker Furnace that is 17 years old.

A few days ago the blower motor overheated and started to smell like it was burning.

This happened one other time about a year ago.

I got the furnace to work again by shutting off the furnace for
about 3-4 hours and letting the motor cool off.

Since I turned it back on it has worked fine.

If I turn the motor by hand it spins freely without making any
noise and without binding.

I was wondering if anyone could shed some light as to what might be going on?

Thanks,

Randy
 
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Old 12-26-08, 01:56 PM
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By spinning freely, that statement is subjective. Does it REALLY spin freely, say like one of those game wheels on tv when the contestant gives it a spin and it keeps going? That is how it should spin. If it does, -

Have you also made sure the furnace filter is clean, and that you do not have a filter in there that is higher than Merv 5 rating? Or that if you have cooling coils located in plenum above your furnace, that they also are clean, - as a restriction may make the blower motor labor.

Although, either of these 2 issues would also make your furnace most likely high limit. But on some older furnaces, they can high limit, without any noticeable negative effects. Mine can.
 
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Old 12-26-08, 03:51 PM
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Hi,

I've changed the filter,

The motor does spin freely and keeps going.

I will check the coils above the plenum,

Thanks,
Randy
 
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Old 12-28-08, 05:47 PM
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Frankly, a motor should not over heat to the point where you can smell it burning. The temperature limit switch in the motor should shut it off before that point.

I'd replace the motor, if I were you. I would predict that this problem will recur and you will have no heat until the motor is replaced.

It probably wouldn't start a fire, but it could cause a fair amount of smoke to be circulated into your home, and it's bound to leave you without heat when you need it.

Consider yourself warned of this impending failure ---twice.
 
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Old 12-29-08, 01:27 PM
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Originally Posted by randyz116
A few days ago the blower motor overheated and started to smell like it was burning.

Randy
I read so fast that this part of the post did not really catch my eye til I read why SP said what he said. Yes. I concur. Not good. Murphy always picks inopportune time for failure, also.
 
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Old 12-29-08, 03:07 PM
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Hi,

Thanks for your input.

I will look into buying a replacement blower motor.

Randy
 
 

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