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Base board hot water - NOISE
I've had this noise before and all I had to do was bleed the lines from air which caused the valve to "ping". This started a few days ago I can not get it to stop. I've drained my over-flow tank 3 times and bled the lines I don't know how many times now. Can't figure out why it won't stop. The furnace has been on since October but this is the first time it started doing this. Any thoughts?