Hello. I have a South Seas Spa and we've always kept it on the Eco mode and set about 100-101 and the filter cycle set to 2. Just yesterday it started running filtration around the clock. The display reads 104 (the max temp) but I have it set on 99 (I have a pool thermometer in there and it reads about 100/101). So would a (false) reading of 104 make the filtration run 24/7? The "heat" light isn't on as it's running. And what would make it have a reading of 104, when I don't think it actually that hot - a bad thermostat? My husband hast turned it off at the breaker twice , even letting it set over night and it continued to do the same thing today.