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ChuckS · 11-24-2022, 06:49 AM

Since you have an outside access panel for the furnace remove the panel and see if there is an error code that flashes on the control board when you try to start it..

If its actually running only 10 seconds that sounds like an issue with the black self resetting fuse Atwood loves to use..

If however the blower run time is longer than 10 seconds then stand outside at the furnace and have helper turn furnace on..

you should hear blower , then a ticking sound along with a whiff of propane..

If the furnace fails to ignite after 3 tries it goes into lockout mode. TO clear this simply turn thermostat off and back on.

I would highly suspect issue with sail switch if your blower runs and no ignition or propane smell

There is also a toggle switch located on the shiny metal case of the furnace.. cycle that off and on a few times as well when making your checks

Again.. look at that control board and note the number of flashes from the LED on the board..

11-24-2022, 06:49 AM	#7
ChuckS Montana Master Join Date: Dec 2017 Location: Mountain Home Posts: 839 M.O.C. #20949	Since you have an outside access panel for the furnace remove the panel and see if there is an error code that flashes on the control board when you try to start it.. If its actually running only 10 seconds that sounds like an issue with the black self resetting fuse Atwood loves to use.. If however the blower run time is longer than 10 seconds then stand outside at the furnace and have helper turn furnace on.. you should hear blower , then a ticking sound along with a whiff of propane.. If the furnace fails to ignite after 3 tries it goes into lockout mode. TO clear this simply turn thermostat off and back on. I would highly suspect issue with sail switch if your blower runs and no ignition or propane smell There is also a toggle switch located on the shiny metal case of the furnace.. cycle that off and on a few times as well when making your checks Again.. look at that control board and note the number of flashes from the LED on the board..