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I have a Trane XL90, model TUX100R948001 furnace. I'm hearing a slight vibration when the furnace is running. Other than that it seems to function normally. The red light is flashing fast which is normal. The motor was replaced 13 months ago. Does anybody know what this may be?

thank you.
Jeff
 

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Could be a dirty blower wheel. Dirt throwing the wheel out of balance.
Could be the inducer mounting screws are loose.
 
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