On my Aqualink RS control panel it says "Air Temperature Open". Since there aren't any other issues with the system, I thought I might have a bad temp sensor, so I broke out the meter and it tested good at 7.47 Ohms. I have also switched positions of the Air and water temp sensor and the error remained with the air temp sensor when I did this and the water temp changed to reflect the correct air temp. I'm starting to think the problem is with the control board, but I thought I would get some other input. Does anyone have any other ideas?