Troubleshooting blower fan issue


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Old 05-26-13, 07:09 AM
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Troubleshooting blower fan issue

I have a 2 yr old maytag furnace/air handler that quit blowing air. Turns out the blower fan isn't running and I don't have a multimeter but I want to see if anyone here can help me figure out if it is the circuit board or the motor (if possible).

With no power on, the fan will spin freely. The fan doesn't stay on in heat or cool. It has a loud hum which I guessing means it has power. Sometimes when it first tries to kick on the fan will spin around once or twice then seize. If I try to manually push it while it has power, it will barely move as if it's stuck in tar.

Nordyne
Model # MGC2SA126C45D
Motor is 1 hp model # 904684

Thanks!
 
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Old 05-26-13, 07:43 AM
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You need a volt meter to properly diagnose. It sounds like a bad motor or possibly a bad capacitor.
 
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Old 05-28-13, 10:33 PM
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http://www.nordyne.com/literature/745c.pdf

Nordyne Miller 622549 run capacitor, 15MFD, 370V, round*


http://www.nordyne.com/literature/708813d.pdf

Looks like the furnace uses a 15 microfarad 370VAC run capacitor.

A good meter to measure voltage and amperage to the motor when demand is present, and ohm the windings and measure the capacitor when power is removed is what I would use, but run caps are cheap and a common cause for this problem.
 
 

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