Hello all I've had this issue every fall since 2012. Now its happening when I need heat the most. I'm going to explain as best as I can. Not an expert so please bare with me. Had a Geofinity Atlas 066 installed in Dec 2011 after my Econar took a crap. I own a 3800 sq ft house just north of the twin cities. I have air ducts on all 3 floors with radiant in the basement and 1000 sq ft garage. I keep my house at 66 degrees garage at 40. I had air in my radiant lines every fall and had to add some water to bump the pressure back up to 18 psi. Two days ago I woke up and it was 60 degrees in my house message on the Geo said emergency low cut out so of course the fan ran cold air through the house. Fluid comes out with the air on a vent way up high directly above the buffer tank. By the way this stuff only happens when the garage floor is turned on. Pressure drops to 0. Can't find any leaks anywhere. This explanation is awful I know. I have a labor and parts warranty on this thing but I feel like people are just band air fixing my problem and I'm tired of it breaking so I'd like to figure it out. thanks guys.