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    ccech3's Avatar
    ccech3 Posts: 1, Reputation: 1
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    #1

    Jul 23, 2005, 12:10 AM
    Loud knocking noise on central air
    I came home today to find that the inside part of the furnace/central air is making a loud knocking noise. It seems to be working fine, but is very loud. Any ideas? Thanks
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Jul 24, 2005, 08:11 PM
    The only thing inside that moves is the blower. It may be loose. May just need a few turns of a wrench.

    Sorry I messed answering yesterday. I spent most of the day at a big outing with 15-20 dogs, mostly Labs.
    Spearheading's Avatar
    Spearheading Posts: 1, Reputation: 1
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    #3

    Jul 25, 2005, 06:56 AM
    Loud knocking noise on central air
    I also have a carrier A/C (five tons) for seven years and noticed the noise when the A/C started. I opened the cover and saw two weight adjustment clips on the fins of the blower and shifted them left and right a bit. I did notice a big difference in terms of the noise level. However, the noise is still there at a much lower level. It looks like the blower is hung with lots of sheet metal screws and is behind a small electrical control pannel not very accessible (all surrounded by a sheet metal case). Is there a "short cut" path to oil or check the blower for losen fasteners?
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #4

    Jul 25, 2005, 07:06 AM
    I am doing what I can to help, but do not have enough experience to help with details like that.
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