suburban sf 42 furnace noise

[surf_bum]

Hi All
I have a problem with my heater it works, but it is making a high pitched noise when the burner is lit. Does any buddy know what might be causing this? I have inserted a link to youtube of the heater making the noise.

Thanks


http://www.youtube.com/watch?v=3U8j66PGWYY

[Old-Biscuit]

Sounds like fan blower wheel rubbing due to expansion when furnace gets hot.

You will need to disassemble furnace and check for rub marks....motor drives two blowers. One side is combustion wheel and other side is room blower.
Either one could be loose, metal could be warping, motor could be loose/mounted crooked.