Hi guys, As some of you may recall, I've been struggling with my Geothermal setup since last year. To recap, I have a 20,000 square foot home that uses 5 Geomax series 2 heat pumps with radiant heat and 5 forced air units. At various times, I've had the heat not work at all, the heat work in some zones only, the heat only use the backup boiler and on and on. This Spring, I was able to confirm that, low and behold, the cooling didn't work at all. I had had enough and knew that the existing contractor that had wired the setup was over his head. So after posting here, Mark (his wife Steph) and Joe (AMI) contacted me and over a near-week period helped completely transform the setup to work. To give you an idea of just how far away from working properly the setup was, there was no way, even theoretically, to make the house go into cooling. Mark and Joe fixed this by setting up a simple "Heat / Cool" switch. This is a short-term solution so that I could get cooling -- and in a nick of time as the weather here has warmed up dramatically just as they finished. They also fixed the 2000 watt pumps to not run if the system wasn't calling for anything (yes, the original setup had the two inner loop pumps running 24/7!). They were able to come in, figure out my fairly complex system and get it into working condition in only 4 days. Thank goodness for these forums where I could make friends with knowledgeable people. I also was relieved, in a way, to know that I wouldn't have been able to fix this myself. As an EE, I felt a bit guilty that I couldn't fix the system myself. I'll leave it to Mark and Joe to give details on the things they designed and implemented (mind you, all this in just 4 days) while here so far.