Furnace help needed!

Well, i took the valve and tapped on it, out everything back together and its working. No sure if it was the valve was stuck or just moving things around jarred whatever was wrong back into its place. We shall see with time if i still have an issue! Thanks again!

Before replacing test the gas valve two coils. The resistance should be almost exactly the same.

Ive got it all pulled apart and have been testing things in the manual that enblethen posted. Spark it good, power ay cricut board, power on both sides of limit switch, power at gas valve. Looks like the valve is not opening. Guess ill replace gas valve and see if that does the trick

Has it been raining there with high humidity? If so take a hair dryer and blow hot air on the control board for 10 to 15 minutes. The controller may have gotten too damp. Our furnace would start burning and then shut down three times and the stop all together until the the thermostat was shut off for 10 seconds and then try to start again. Until the control board was dry it would not stay lit. In dry weather it would not act this way.

It is possible that the gas valve is not opening.
Have a helper turn on furnace while you go to the outside and see if you small propane.
It could be the valve, doubtful, or circuit board.
Loose connection or poor ground on gas valve.
You should be able to remove cover to gain access to furnace components.
Suburban NT models

Light your stove. That sometimes help get a fridge and furnace lit by getting any air out of the propane lines. And that will tell you there is propane in the lines. I always have to do that after it sits.

Yes, been using the same gas all summer. Furnace worked this past spring. Still running on same tank of propane. Its a saburban furnace

Has the propane had time to get through the piping?