I am from Omaha,NE. Had a new CM GEO System installed while building the house in June, 2015. The system was running fine all summer with only one instance of lock out because of low loop pressure. As soon as the heating season started, I had all kinds of errors. The most prominent one being Low loop pressure. The installer came multiple times and finally CM distributor was there and came to a conclusion that the loops were causing the issue. The incoming water was freezing ( they were saying that the water was not picking up the heat) , I had Hot water heat exchanger performance error also on the thermostat. (possibly because the heat changer had ice build up). Finally, they contacted CM and climate master said that I needed six loops ( mine are Vertical closed loop) instead of the four they originally calculated. During the process, they found out that two of the original four were never working, so they had to put 2 new loops apart from the two they are trying to add now. I was running on emergency heat all this month and half they were trying to figure this all out. Now they added all six loops, everything is working ( we can really test the system until next winter any ways) now. I am running on heat now but, the temperature are in 50's and 60's these days, so I except it to not have any issues until winter if any. The only issue I am having now is "grundfos Pressure sensor" error on the thermostat. They changed the sensor and tested if EXM is good and changed the wiring harness according to the manual. But, I still have that error and they still are not able to figure this out. Please advise on what might be the issue. I am very much worried about the long term reliability and really upset with the installer and the builder. Has anyone else experienced this same pressure sensor issue? I am not confident that what they did will fix all the issues, as this is the first error I experienced before starting with the low loop pressure issues and everything went wrong from that point. There was/is not a single day that I operated the system with out any error on the thermostat since dec 2, 2015.