Goodman GMH80903BN Harmonic High Pitched Whistling Noise at Burner light up
I'm trying to figure out what is causing a harmonic high pitched whistling boise at burner light up on my Goodman GMH80903BN furnace. The noise starts at about 35 seconds into the video, and quietens around 40 seconds. Often the noise will last longer. The furnace is about 10 years old.
Any suggestions on solutions would be really appreciated!