Atwood furnace - clunking noise after shutting off
I have an Atwood furnace in my unit which is a 2019 Keystone Cougar and the furnace will run and once the temperature is right, it shuts off the heat and then the fan runs for a period of time. After the fan shuts off, within 15 seconds I hear a relatively loud clunking noise. Is this normal?
I was searching online and all I have been able to find is information about normal household furnaces and when that happens it's due to a filter needing to be cleaned. From my understanding, which is limited, the furnaces in an RV don't have a filter, so I am not sure what is causing the noise.
Any information would be greatly appreciated.