i have a 2000 seven seas hot tub..this past fall i put a new element in and no fix. so then pulled the heater probe out of the back side of heater tube and let sit in open air and later it seemed to work fine...then slid it back onto the heater tube and it seemed to work for months..now i go to use and it was 50 degrees and so i shut power off to tub and turned back on after a hr and then it said flo and i go out later that day and it is running(was running b 4 but no heat) but still no heat light and no warmer..it is circulating but no heat indication on topside controll and still cold.....what would b the next steps to do or check????? and or do you need any more specific info..i may have left something out but?? need assistance thanks!!!!!!!