I have a new hot tub, it's a month old from Laguna Bay Spas. Here's what I'm seeing, heater works, water gets hot. After several hours of not using the tub, like going out in the morning, I'll open the cover it will say 102-107. I kick on the main pump, (which is the one attached to the heater), and the temp will drop to mid 90's. The tub is cooling off but the temp at the thermometer is staying high. Seems like it is cycling the heater on before the pump or something. I called the company, and they sent me a new spa pack, (controller board) and I have put it in, but I get the same thing.