My recently installed Infinity 98 (59MN7 series) has what I think is a noise issue.
I leave the fan on 24\7. LOW speed at night, and MED during the day. During the night (LOW) it makes a periodic noise (comes and goes). The noise is sort of a warble-resonating-whir noise. This happens when the heat is on or off and is not the inducer noise. I'm wondering if the fan needs balancing or other? Or can the LOW speed fan rpm be adjusted up slightly to hopefully eliminate the resonate noise?
Please advise, thanks.