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Can i test run the fan motor by bypassing the capacitor

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  • Broan-NuTone Master
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Maybe: If you can manually rotate the motor to get it started.
The capacitor is on start winding, and causes sudden release of amps that starts the motor.
There are two (or four) windings in each single phase motor.
Both receive power at same time.
One winding is the start winding, which can be considered 'low gear' on a transmission. The capacitor is on this winding and gives burst of enough power to begin rotation.
So when a motor just hums, and doesn't rotate, then the start winding and/or capacitor are suspect. Dry or worn bearings are suspect too.
The other winding is the run winding that brings motor to up to speed.
On fan motor, the run winding can have multiple connection points for selecting different speeds.
Illustration.
http://waterheatertimer.org/images/Motor-wiring-500.jpg

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: fan stopped running. no power to the fan (ie, no

i have the same problem 5742993386 let me know if you find something and i will do same

Posted on Jul 26, 2010

hondo73162
  • 132 Answers

SOURCE: Fan does not work motor will buzz thats all. Nutone ultra quiet t

it may be that the bearings nead to be oiled, have you tried to spin it by pushing it with a pencil and see if it sticks or spins freely ?

Posted on Nov 07, 2009

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