I have a First Co. 36MBXB-HW system (a unit in my attic and one in the basement) and a New Yorker boiler. Last week, I turned on the heat on my second floor, it was about 10 degrees outside, and it only blew cold air. My heat on the first floor worked fine. I thought it might be the Grundfos circulator pump, which has failed before and I've already replaced once for each floor. Bought a new pump, installed and it still blew out cold air. A few days later, the temp went up to 55, so I turned on the heat to the 2nd floor, and it blew out warm/hot air. Yesterday, I turned the heat on to the first floor, and it was blowing cold air. Heat on 2nd floor still works now, but first floor is blowing cold. I cleaned out the air filters in both units, but that didn't fix anything. I doubt its the circulator pump because of what happened with the 2nd floor. The temp outside is 25 degrees. Not sure why heat doesn't come on during coldest temps, or how to repair.

Hi, I've got this "Comfort maker" heater. My house is 3 stories tall.. there is the basement, then there is the main level, and then the top floor is one large apartment-room which has a separate heater/air conditioner from the rest of the house. My concern is about the heater on the top floor, which is where I live. My concerns about a failing unit are great. When my air conditioner was replaced this summer, the HVAC guy remarked that something about the heater was "out of code" and that replacing it would likely cost well over $10,000 (this was 3rd party info to me, but I was thinking "WTF?!"). I have yet to determine if he is setting up a scam or what. Anyway, I hope nothing is really wrong with my heater, but I think that it is quite old...at least 10 years. I live in Alabama, so it's not extremely cold, but when it comes on at night, I've noticed that it blows only cool air for what seems like is too long before it starts to warm up. This makes me nervous, because that's exactly what happened when my a/c started to go out last year (took forever to start blowing cold). I should point out that, at this point, it is still keeping me warm (it went down to 30 last night, and it was fine when I woke up). However, my concern is about the beginning of something going wrong, a clogged pipe somewhere, etc (sorry, as you can tell, I am very unknowledgeable about hvac issues) Finally, when I was messing around in the closet, I noticed the pipe (duct) that comes out of the top of the heater is way too hot to touch, all the way up to where it meets the next, larger duct. I've attached some pics of the setup to help you help me. So, please help.. [ATTACH]8825[/ATTACH][ATTACH]8826[/ATTACH][ATTACH]8827[/ATTACH][ATTACH]8828[/ATTACH][ATTACH]8829[/ATTACH]