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Turning on the heat makes a loud noise then i turn it off and just run the fan no noise

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This sounds like an oil burner, which would mean your getting an oil biuld up in the fire chamber when the burner fires up. If it is a gas furnace you need to ajust the air flow.

Posted on Oct 03, 2008

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I've seen sticks, birds nest particles and pieces of deteriorating fan blades (squirrel cage type fans) cause this.

You might also find that the inducer motors bearing are going.

If its a loud vibrating grinding type noise, I'd suspect bearings or missing pieces of the blades. (unbalanced)
If it's a clanking type noise I'd suspect loose items hitting the fan.

The inducer motor will only operate right before and during burner operation, while the blower motor can operate at any time depending on your setting.

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