I have an 8 year old ventless fireplace (VFGL-24VSP-3) made my Superior. The underground tank was empty all summer and I just had it filled.
I have a strong blue pilot. But as soon as I hit the wall switch or the switch on the unit to turn on the main burner, the main burner ignites for about 2 seconds and starts going out.
I have noticed that when the main burner ignites, the pilot light goes out and starts spitting and sputtering, almost like there's air in the line. But without the main burner on, the pilot light is good strong and blue.
I assume that the pilot light should always stay lit while the main burner is on. But it's not.
Where would you start to troubleshoot this? Thanks for any help (before I buy a bunch of parts I may not need).