I have a screenlogic easytouch 8. I can't get my heater to work because the screenlogic is misreading the pool/spa temperatures. It is correctly reading the air temperature. I've tried to calibrating the temp in set up but it is not staying? Any suggestions? Do I need to replace the thermostat that goes with it? I'm pretty sure that I found the thermostat that goes with it. If so, anyone have a good video for that? I really just want to use my spa. I want to say that the temp is off by at least 40 degrees.