AC duct noise

[tmisiak]

Hi,

We have 2 Furion AC units on our '21 2800bh. If only the bedroom unit is on (does not matter if ac or just fan is running), the ducts around the main AC sound like there are small birds running around inside. Once the fan on the main AC unit is turned on, that noise goes away. Any ideas on what it could possibly be? Assume it's installation of or debris in the duct, but not sure how to troubleshoot or access.

[Second Chance]

The first thing I would do would be to pull the interior trim off the main AC and take a look up inside. Check for loose aluminum tape, baffles no longer in place, etc. You should also be able to put a hand into the ducts on either side a short way and see if there is anything there.

Rob