dan412 Posted January 5, 2018 Report Share Posted January 5, 2018 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. Quote Link to comment Share on other sites More sharing options...
WeBeFulltimers Posted January 5, 2018 Report Share Posted January 5, 2018 Make sure the fan is set to "auto" on your thermostat. Quote Link to comment Share on other sites More sharing options...
Second Chance Posted January 5, 2018 Report Share Posted January 5, 2018 (edited) 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. Rob Edited January 5, 2018 by Second Chance Quote Link to comment Share on other sites More sharing options...
dan412 Posted January 6, 2018 Author Report Share Posted January 6, 2018 Thanks I will look at that today. Quote Link to comment Share on other sites More sharing options...
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