ChuckyDee

Hi, I'm in Texas. The middle board does not appear to be touching anything. The pump wires have not been touched or moved in 12 years, so I would think they are in the correct position. In the 3rd picture above, look for the C 2009 imprint on the top left of the circuit board, You can see a slight discoloration on the board there, and below J24. That is the only damage I can see...

Spa is about 12 years old, came out recently to find the gfci tripped and water cold so it had been off a few days. After restarting, spa ran normally but heater was not heating. Replaced the heater with a 4.0kw replacement and refilled. Touched nothing on the motherboard and re-used the 2 electrical leads that go from motherboard to heater tube. Spa starts normally and pumps and controls work. After system calls for heat, a loud crack and spark and smoke appears near the relays and the GFCI trips. If I leave the heater tube disconnected, the spa runs and the motherboard wires are putting out 240. Of course, these relays are soldered on the board, so not easy for me to replace. Question: worth trying to find a shop to remove/replace the relays or just buy a whole new spa pack? This one is Balboa 56286-01 and its no longer made. Thanks!

Thanks everyone! Replaced both temperature sensors and the spa is back in business. Started right up with no error messages. It's been running for a couple of hours and the temperature is steadily climbing. It had dropped down to 65 degrees!

Thanks, I ordered both sensors. If that does not resolve the issue I'll post back with the pictures and schematic as requested. Thanks!

I'm getting this same error condition. Did you ever find a resolution? https://www.poolspaforum.com/forum/index.php?/topic/55861-marquis-spa-wbalboa-wont-run-htr-too-hot-press-btn-to-rst/

I measured the heater sensor today by unplugging them from the motherboard and checking resistance. Sensor A was 42.0 @ 70f Sensor B was 4.9 @ 70f My take here is that one is bad????

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.