How do I fix a furnace when there's banging when turned on and when it's shut off?


If it's oil canning the duct work (which is usually that type of sound...pressurizing and depressurizing with the fan) you need to locate the weak point and reinforce it.

Updated on January 18, 2018

Original Article:

How to Figure Out What is Wrong With Your Furnace
By Dan Robbins