ChallengerRV, welcoem to iRV2.com. We are glad to have you join us here and we look forward to reading of your adventures and experiences. You should tell your friend to turn off the gas. disassemble the burner and clean the complete burner, orfice, ignitor/thermocouple, chimney flue and baffle. If this does not correct the problem, he could have a bad ignitor, board or just the wrong lp gas pressure. Good luck and keep us posted.
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7