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I've just replaced the filter in my AC/furnace and for the first time ever there is a high pitched whistling noise coming from the unit whenever the AC is on. I can't figure out where it's coming from. It sounds almost like air is leaking from somewhere and being pushed out under pressure. Any ideas/suggestions?
Since you never heard it before- I think it would be a safe assumption that the whistling is air leaking past the frame of the filter. So either it's not seated properly or the frame is damaged/bent, etc.
My other suggestion (which would be much more technical) starts with a question- how long ago was the last filter change?
I've just replaced the filter in my AC/furnace and for the first time ever there is a high pitched whistling noise coming from the unit whenever the AC is on. I can't figure out where it's coming from. It sounds almost like air is leaking from somewhere and being pushed out under pressure. Any ideas/suggestions?
I bet you bought one of those "efficient" pleated filters?
I had the same problem - it turned out to be part of the frame not fitting together correctly - when we felt around and pushed one area of the frame, it quit whistling immediately. Look for sides that have no screws or less than the other side. My new unit had double screws on one side and one on the other! go figure. However, the AC guy is concerned that there's not enough returns in the house, so it's trying to get air from the outside. Don't know about that, still investigating.
By "frame", I mean the outside of the package unit.
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