Hi Steve,
Since Monday my temperature sensor is going bad. I had the watchdog error then now since yesterday it was shutting off after few minutes. I have this jacuzzi hot tub since end of September, this is a j-280. I did what you explained and it worked. Now the temperature seems to work a bit, the tech will come Tuesday to fix the sensors, I was a bit stressed about this new problem, I guess this is related to the watchdog issue as a protection.
Really glad to have found this blog. Thank you!
Patrick