If the furnace blower motor operates on single phase power, it HAS to have a start capacitor and a start/run switch. Otherwise it will just sit and hum. If it's a 3-phase motor (not very likely,) then what 78buckshot said would be true.

Last edited by klhansen; 04/17/2025 8:10 PM.
Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.