Pull plug reconnect and cycle unit to check for spark. Possible reasons for no spark; weak battery, broken plug wire, failed distributor(highly unlikely) If you have spark your problem is either valves aren't feeding combustion chamber or your ratio of propane:O2 is off. Turn off propane and O2, open both the one full turn, fire unit, if nothing happens check for propane smell, if you can smell propane, adjust O2 1/2 turn and repeat fire. It's easier to talk someone through sequence while they are working on the unit so hopefully you're able to understand my directions. PM me with ph and maybe we can get it working. Not on here much anymore so be patient.