ChuckyDee Posted February 21 Report Share Posted February 21 Hi, my Marquis spa has a Balboa spa pack and M7 heater. It had been running normally. My neighborhood lost power for 8 hours (not sure if related, but background info). A few days later I went out to get in the spa, and discovered the water was cold and the panel on top (tp400) is scrolling the message "htr too hot --- press btn to rst" The spa is not hot, nor is the heater tube. Infrared thermometer shows 79f on the heater tube. No button press combo on the control panel does anything. I cycled the 220 breaker at the main, and then switched on/off the gfci breaker next to the spa. System boots, but instead of going to 'prime' it starts scrolling the htr too hot message. There is no pump action and the panel does not respond to any button push. Turned off gfci breaker overnight and tried the next day, same result. I unplugged both heater sensors from the motherboard and switched power on. The spa led lights flash on/off and the board reports sensor error. Plugged the sensor back in and powered up to the same htr too hot. Switched the heater sensors on the motherboard and powered up to the same htr too hot message. Not sure what to do next. Appreciate any ideas. Quote Link to comment Share on other sites More sharing options...
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