Hey Lew, knowing you're the gas guru I'm hoping you don't mind me running this by you for your (solicited) 2 cents. I'll paste the actual post here:

Installed a new Suburban NT-30SP in my '69 Safari and I'm testing it with the front cover off. Fan comes on, flame comes on but only for 10 seconds or so before going out, fan runs continuously and won't switch off. Since I'm "jumping" the trailer's thermostat (see below) seems like the unit should be ON (with flame) as long as the 2 thermostat wires are connected.

(Unit arrived with only one blue thermostat wire showing. Schematic showed second (blue) thermostat wire connected to red 12V wire. I added this second thermostat wire myself, then jumped the thermostat by connecting the two blue wires together. Correct me if I'm wrong here, but I think I'm ok with that. Sort of a 'bench test' but unit's still in the trailer.)

Any help appreciated. Rick O. NOLA