I HAVE A GARDEN & PATIO HEATER 60368 MODEL NUMBER, IT WILL NOT STAY ON, IT STARTS BUT WHEN YOU LET THE BLACK KNOB OUT THE FLAME GOES OUTSTART . IF I AM CORRECT THERE SHOULD BE A PILOT LIGHT THAT SHOULD STAY ON. IF SO WHAT IS THE PART NUMBER, OR CAN THIS BE CLEANED UP TO WORK. THANK YOU CHUCK ELLSWORTH