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
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?