When I check the water temperature on my Aqualink Control Center by quickly pressing the Pool Temp Boost button, it shows 85 degrees which I believe is correct. However, when I power on the AquaLink PDA, it shows the water temp is 120 degrees. This difference in readings started about 1 week ago. Is there only 1 water temperature sensor? If so, why the 2 different readings? I am concerned that this will affect Freeze Protect mode this winter. Ideas on how to resolve this issue?