Hello,
I have a Viking Spa Hot Tub and it keeps overheating. I lowered the filtration cycle to F1, replaced the filter and it keeps giving me the HH code. Climate is not an issue as it was in the 40s at night. The water temperature matches within a degree of displayed temperature checked with a thermometer. All the jets are opened and it just keeps rising with the lid off. The heater light isn’t even on. Any help would be appreciated.