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Furnace Noise


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The furnace on our 2016 Montana 3820 FK fifth  wheel  makes rattle noise when the burner is on and furnace runs  a long time even when the thermostat is turned down. We are in Milton Florida where its 25 degrees outside. But the furnace will run for  hours without  turning off even if it's 70 degrees inside and the thermostat is turned down to 65.

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16 minutes ago, WeBeFulltimers said:

Make sure the fan is set to "auto" on your thermostat.

X2^^. The rattle noise is likely in the sheet metal of the furnace housing or the plate at the tack of the furnace where the ducts are attached. On many fifth wheels, you can access the back of the furnace by removing the divider panel at the back of the basement.


Edited by Second Chance
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