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I installed a Mr Heater 30,000 btu ventless propane radiant heater in my 500 sq foot basement fishroom. It currently isn't insulated and we're in the Northeast part of the country. I went oversized just to make sure there's no problem in the winter. First day I set the heater and it was off in the morning. Second day after restarting it was off when I got home after work. I thought maybe it was set too warm and it was using up all the oxygen in the room. Played around with it for a few days. It seemed better for a day and then it started turning itself off again. I disconnected the venting going to the upstairs room and hooked a fan up to it. It was pulling a fresh supply of air into the fish room and I also cracked the fish room door open. I also took apart the pilot and cleaned the pilot orifice. I also adjusted the thermocouple so it was sitting farther into the pilot flame. The propane supply is from a large tank that's regulated coming into the house. Watched the pilot last night and it will be fine then it starts to flicker and goes partial. This then kicks off the gas valve because the thermocouple isn't hot enough. I don't think it's an air supply issue. Already have another one on the way and returning the old one. If the new one gives me the same issue it must be an air supply problem. Has anyone had issues with this? If so, how did you overcome it? Just wondering in case the new one does the same thing. Although, it seems like it was a bad thermocouple or valve.