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Hi Ray,
If it is indeed whistling as opposed to a squeak or scrape, then it's more suggestive of problem related to air moving through or past an orifice or tight, possibly varying gap, BUT you mentioned the whistling doesn't change with fan speed which is not what I would have expected.
In any event I would do a few things to investigate ...
1. Remove the filter and inspect it for any damage or loose adhered debris.
2. Run the unit without the filter to determine if the whistling changes in any way.
3. Carefully examine with torch in side of the indoor unit looking for any loose components it debris.
4. Lastly, if you're game, remove the indoor unit cover (not always easy) and examine for loose components, debris or any mechanism with excess play.
Good luck on the hunt.
Best
JA
Last edited by JA; 10-05-2023 at 07:43 AM.
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