First I would check the LP gas tanks to make sure they have gas and are open.
Then I would run the gas range to prove to myself that the gas is turned on and working.
Then I would try the furnace again. If still no light, I would take in for warranty repair.
2016 Road Warrior 355
2015 Ram 3500 Cummins SRW 4x4 MegaCab ShortBed
2011 F150 ecoboost - Traded
2015 Jayflight 28 BHBE (sold)
2009 Jayflight 26 BH (sold)