My 2 yr old tub will allow me to set it to 106 if i hold down the + temp long enough. Not sure if it’s supposed to - in the coldest part of winter we sometimes set it that high since its a 110v & the temp will drop quickly with the jets running. Its a lifesmart.I also noticed that this control has the pre-2009 temp override, and will heat to 108* (ut-4).
That's a selling point to the right buyer. It truly amazes me that people could want it that high, I keep mine at 102*.