Furnace problem

[Maurice45]

The furnace in my 2018 3120 comes on nd lights but the burner only stays on for a few seconds, shuts down and then repeats the process. I've had all 3 burners on the stove going with no dro0 off in flame so i dont think it's the regulator. Any thoughts?

[jimcol]

You can get many guesses on this problem. Go to the User CP section in the second brown bar at the top of this forum. Click it and you'll find manuals that will probably help you trouble shoot your issue.

[jsb5717]

The fact that it is igniting tells you that that it's a post-ignition issue. You might first make sure that the airways are clear so that it can breath. If those are clear then it might be the igniter/flame sensor - check the distance from the burner. That spec should be in your furnace manual. It's rare but could also be inadequate propane flow which would make it a regulator issue (the demand the furnace puts on the propane system is higher than the other systems that will continue to work without issue). It could also be a mainboard issue. One thing to try is to check all of the wire connections. Sometimes just removing them then reseating them can make it work.

[sourdough]

Jeff has given you some good suggestions. I would just say that in my experiences, with my last 2 trailers (including this one) the boards were bad (2 on the last one). This one did what you are describing. The last ones would ignite, run for a few seconds and stop. It would do it 3 times then stop until I reset it. I don't know the make of your furnace but does it have an LED on the board that might help direct you to the issue?