Loud knocking noise on central air

ccech3 · #1 Jul 23, 2005, 12:10 AM

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 · 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 · Jul 25, 2005, 06:56 AM

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 · 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.



At Ask Me Help Desk you can ask questions in any topic and have them answered for free by our experts. To ask questions or participate in answering them you must register for a free account. By registering you will be able to: Get free answers from experts in any of our 300+ topics. Accept money for answers that you provide. Communicate privately with other members (PM). See fewer ads. Sign Up!