Hello. I’m desperately trying to get help for our heatilator double sided fireplace converted to propane model gdst36. It’s minus 20, the house is freezing. We have spent thousands trying to get the problems sorted out. We finally got the first problem fixed. The fireplace was burning but everything would soot up in an hour , after a few hours we couldn’t even see through the glass. We kept telling the installer he needed to find the baffle and open it. After 3 house calls he finally found it and said it was completely closed ... problem fixed ??? Nope, now it burns for 15 seconds before going out with a poof. It stays on if the glass is off. It use to work sometimes and not others. Now it consistently won’t work. We have had several people in to look at it. No one knows what to do . Can anyone advise? Sounds like people have had similar problems which seemed to be a sensor. Thank you in advance for any suggestions