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My furance seems to producing enough heat and warming the house well. I noticed about 3 days ago it sounded like it was pulsating. The vents sounded clear. I almost could feel it in the floor. Went downstairs no trouble codes. Also pulsating was barely noticable in the basement. Once the heat was off i turned on the fan to see if it would still pulsate. Nothing. Any suggestions??
 

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HVAC Tech/ Browns Fan
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Fan wheel is coming apart from the hub. Check the play of the wheel from the hub. Be careful it can get worst if you play with it too much.
 

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Very common for older 90's to start cracking where inducer wheel is molded to metal hub, which attaches to inducer motor.Usually wheel just needs replacing, but due to age , the hub is rusted to motor shaft, so you end up replacing motor also.I've gotten to a point where I quote motor and wheel every time ,and if I get lucky and wheel comes off, clients bill is cheaper.
 
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