I have had this spa for about 5 years now, and it suits our needs perfectly. We have a problem this year. When we run it on low, it heats past 104 and eventually goes to "OH" I clear it by unplugging (110) it and letting it sit for a while and then it will run again, but right back up over 104 and eventually back to "OH" So I'm thinking High Limit/Freeze sensor.
I also have another problem where the breaker will trip when the jets are on high for about 3-4 minutes. I'm not sure what to make of this one - it does not trip the GCFI outlet the spa is plugged into on the deck, just the breaker in the garage that the spa is on (all by itself) I have not replaced the breaker since I installed the tub, why would it all of a sudden be tripping? Are these items related? Could the breaker be bad? I believe it is just a 15 AMP breaker - maybe 20, but I don't think so.