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Furnace blower motor

Asked Feb 22, 2006, 11:05 PM — 1 Answer
A friend asked help about his furnace blower emitting a screeching sound during operation and then just stopped. I went over and tried to rotate the blower by hand - resistance to free rotation was present. Removed the blower assembly and dismantled motor. No lubrication on both motor bushings. Cleaned and lubricated bushings and re-assembled motor and fan. Now it rotates freely. Tried to start the furnace - burner started to fire but the motor just hums till the burner went out. Rotated the blower - free! The motor is capacitor started - could not locate any nameplate for both the motor and furnace. What might be the problem? It is getting colder. Please help!

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labman Posts: 10,673, Reputation: 3050
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Feb 23, 2006, 04:38 AM
Some motors have a centrifugal operated switch in them that must release for the motor to start. Its contacts may have welded when the motor was overloaded from the dry bearing. I haven't had much luck getting such motors to run right very long.

Ordinarily I would say a capacitor start motor that hums rather than starts has a bad capacitor. I find it doubtful the capacitor went bad while you were cleaning up the bearings. You might carefully check the connections to the capacitor.
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