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Knock Noise When Carrier Furance Starts Up

I have a five year old Carrier Weathermaker 9300TS furnace. Earlier this year I had to have the blower motor replaced for the first time. Within the last week or so when the furance starts up, the motor is in a low speed to clear our fumes...when it gets into the next speed to start heating the air, I hear a knock, sounds like something metal hitting. Before I call the repair company that charged me almost $600 for the blower motor, any suggestions on what this might be doing to cause the knock? Other than that, the furnace is working fine (and hopefully for a long time).

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  • 38 Answers

Have the ac company check the actual blower wheel itself it may be slowly coming apart

Posted on May 07, 2009

  • gregory80
    gregory80 Nov 27, 2012

    I have the same problem except my furnace is 2 months old... the company owner came over and said... "since your furnace is on the main level you can hear it, most furnaces are in the basement." Then he left...

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Posted on Jan 02, 2017

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