leafs

I don't have an ohm meter (will get one and check as suggested) but I reset the filerting times; filter 1 runs from 2-5am and filter 2 2-5pm. The pump is set on economy so it only runs during these time periods which also heats at the same time. Last night the tub never got up to my temp setting of 102, only 98 and when we ran the tub the temp gradually dropped down to 95. My understanding when the tub is running the heater should be on at all times, is this not correct. Now this morning when I checked the water temp it was sitting at 102, exactly where it should be.

My water temperature goes into overheat when I set the temp at 102. I've backed down the heat to 95 and then I can't get the temp up to 100. When I increase the set point up to 100, the temp climbs to 107. I've checked the temp probe to make sure it was inserted all the way into the tub cavity and that.s ok. Do you think I have a faulty temp sensor or could it be something else.