High pitch frequency heater/blower
Just purchased a new 2022 FR Rockwood Ultra-Lite 2606WS TT. I have been going through it and running everything to make sure it's working. One thing I notice is when the heat is on there's a high pitch frequency that is very annoying. You hear it on the inside and outside.
I removed the wooden vent to the heater/blower and when I removed the metal plate that directs the forced air into the ducts, the noise went away but the air just blows straight through. When I put the metal plate back on to force the air through the ducts, the annoying noise starts up again.
Anyone ever have this problem?