First time poster from Long Island.
This past June I had my old oil burner system replaced with a Burnham ES2 gas boiler and hot water system. The furnace is in an unfinished work room in my basement. About two weeks ago at about 6am, the CO alarm went off in the finished part of the basement. I went into the furnace room and everything seemed to be running OK but the room was warmer than I remember it getting and it was damp. I later attributed the dampness to the laundry that was hung in there. I opened the window and called the installer. He came by and checked the draft and the settings on the system and everything seemed OK. The alarm had not gone off again, and I was not sure if it was beeping in the pattern that alerts to an actual detection of CO.
Forward to today, the alarm goes off again, same time. This time I notice that the beep pattern is signifying that it is detecting CO. I go into the furnace room and it is very warm and damp and there was no laundry hung up this time. The flue is open and drafting (I put a piece of smoldering paper near it and it drew in the smoke). I was thinking that maybe the CO alarm is faulty (and I am getting another today just to make sure) but the atmosphere in the room is what gives me pause.
Could the space the furnace is in be too confined? It is about 288 SF, and the furnace is 105,000 BTUs. Any and all thoughts would be appreciated. Thanks.