Pilot light will stay lit and main burner will light but it will shut down soon after lighting. I light the pilot with ease but shifting the valve to on must be done berry slowly. It has been thisvway since I bought the heater. Some times the main burrner will stay lit for 10 min and some time a day and other times it will only stay lit for 10 seconds. can you help? You can call me at 541 490 9190 thanks Jesse a call is a lot better Email Maninthehood@ yahoo.com