I have 4 RC-80B single stage thermostats connected to my Omni Pro II that are showing temperature of 27 degrees and do not work. I replaced them with new ones that I had and with in a few days they are all showing a room temperature of 27 degrees again. Anyone have any idea why all the thermostats are acting in this manner. There is obviously something up with the control board as I do have two other thermostats that are not connected to the control board which work fine. Any help on this matter would be greatly appreciated.