Many of the igniter control boards do have a feature to shut down trail for ignition upon 3 failed attempts to light. It is a safety feature. If there is no flame sense feed back, it stops trying to light. And yes, the blower keeps running but there will no longer be any attempts to try to light again until the system is reset.
Your furnace is an older one, not sure of your background with this camper, did the furnace ever work when you owned it, how many years was that?
The gas burner has a diffuser screen that sometimes rusts out over time, and the ignitor may not be in the right place do to a mounting issue with the corrosion inside.
Caution needs to be taken on next steps if you have never worked on LP gas appliances. We can't teach you how to look for all the things you may not see or have the gauges to test with. If you have a friend who services home LP appliances, they can help you if you have never worked on gas systems. Or take the camper to a repair place. Only attempt any further work if you have worked on gas appliances before.
You can access the gas burner to see if the burner inside is all corroded and what shape the electrode is in. And you should have the gas valve tested for leaks. On a furnace that old, if corrosion has rotted out the diffuser screen, the gas valve may be corroded inside and not seal up any more either, which means, do not use this system until it is fixed. Finding a new gas valve may be a challenge. It all depends on who port configuration you have. Dometic who now owns the Atwood hydro-flame is discontinuing parts all the time.
This link will show how your gas burner & gas valve will come out as a unit. This is on
a bench test setup. You can remove the burner while the furnace is still in the camper. The gas has to be shut off and the lines purged before removing any parts. All 12 volt DC power from the power converter and including the battery, to be off. The LP gas system will then be opened up after the gas line if removed from the gas valve and no other gas appliances can be used in the camper unless the open gas line is sealed and tested it does not leak. Your burner will look different as this is a newer 8500 series Rev IV style, over your older rev II style, but the same big picture concept is close. Scroll down some in this link until the furnace starts showing up. https://www.sunlineclub.com/forums/f...tml#post154909
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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