I have a jacuzzi j315 2005. At random this summer I opened the spa to find - - - reading on the display and the water outside temp. Turn power off and back on. Spa cycles on and runs up to temp that is set and past and over heats and shuts down. Repeat, repeat, repeat. Checked connections and fuses. Idk what else to do at this point. I drained and decided to look for help online. I replaced the heater in the last 3 years. The motherboard was replaced in the last 5 years.