strangefolk

Hello, I have a caldera kauai hot tub that the temp light stays at 50 degrees and will not maintain a temp. I can reboot the hot tub and it will heat up to 104, I use a normal thermometer to check the temp, and then continues to go down until I reboot the hot tub again. the Temp light never changes from 50 degrees. everything else works fine. I can adjust temp settings on the console but it never changes from 50. the main motor was replaced not long before the temp light got stuck at 50. Any thoughts on what to test or replace would be greatly appreciated.