C cathieshbkhhh Guest Jan 26, 2009 #1 a few days ago when i turned on my heat or vent there was a knocking sound. 2 days ago my heat went out. dont know what is the problem and how do i fix it.
a few days ago when i turned on my heat or vent there was a knocking sound. 2 days ago my heat went out. dont know what is the problem and how do i fix it.
