Since few days I have the carrier infinity control at my house installed without an outdoor temperature sensor (OAT). The model of my furnace is an infinity 96MVP (date of installation nov-2005 and my A/C is a lennox (HS18 series - year of installation - 1989). The infinity control is showing that the A/C is OFF, while it is working! I have called the company who did the installation and still waiting for their call. Any explanation?
Also since the installation of the infinity control, the A/C is ON for fe minutes and OFF for long minutes. In a cycle of one hour, it was ON for a total time of 12 minutes only and OFF during 48 minutes even if the targeted temperature was not achieved yet. This is not what we were expecting! Is there someone who had this problem before? I have called the company who did the installation but still waiting. Meanwhile, I am curious to have an attempt of explanation.