david bsrron
Nov 25, 2012, 01:27 PM
My furnaces buzzes when comes on. Coming from contacts I believe
PJmax
Nov 25, 2012, 01:57 PM
It could be coming from the contactor that connects the incoming power to the heating coil(s). Could be a sign of it going bad, Some contactors just normally buzz lightly.
You'll need to open service door to determine exactly where noise is coming from.