Nutone 352 central vacuum making grinding noise

Old 07-26-14, 09:26 AM
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Nutone 352 central vacuum making grinding noise

I have a Nutone 352 central vaccum unit installed in my house. It is at lease five years old, came with the house.

Recently, the vaccum motor is making a grinding noise while running. When vaccum is turned off, the noise continues until the motor stops.

What could be causing this noise and how to fix it?

Old 07-26-14, 09:44 AM
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You can disconnect power and then remove the top cover to inspect the motor. I've had a built in vac for 35 years. Been thru two motors. You can rebuild the motor but it may be more effective to just replace it. That whirring sound is usually what it sounds like when the brushes are going bad or something has gotten thru the filter and sucked up into the motor unit.

The link is to replacement parts and at the bottom is detailed instructions for servicing your unit.

Central Vacuum Online Store

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