I have a HEATILATOR GNDC36 Fireplace running on propane. I will try to describe it. It has a vertical stack to the roof ending with a terminator cap. It is a direct vent model, using room air, and has a standing pilot ignition. The gas control has the usual thermocouple and thermopile arrangement. The direct venting consists of a built-in fan that draws room air at the bottom, blowing the air upward behind the heating chamber and back out the top into the room, thus giving warm air. It has a plate glass removable front that pretty well seals the heating chamber from the room in the front at least. There are 2 separate wall controls to turn off/on the fireplace burner and the fireplace blower fan.
It is seven years old, and worked fine when I last used it two years ago. The current cold snap has caused me to want to use it again. I can't get it work right.
What happens is this. I ignite the pilot manually the usual way (turning the knob to pilot and while holding the knob in, pressing the igniter button which clicks a spark). I then turn the know to burner position, and turn the burner wall switch ON. After a slight delay the main burner comes on and will stay on. Now the bad part. If I close the front plate glass, the burner will not stay on - going out and taking the pilot with it. If I don't put the glass on, the burner will stay on, presumably forever. The blower fan seems to work fine off the wall switch - so I don't think that is a factor.
It is almost as if, the burner goes out from lack of air. So that raises a question. If I can't get any help as to what is wrong with my fireplace, I at least would like to understand where the air comes from to support the burner flames? I simply do not see any passageway(s). I have read and printed every web documentation on this fireplace, and no mention is made of where that air would come from.
Thinking that is my problem, I am looking to find out why air is not getting to my burners.