J-300 won't heat. FLO readout
I emptied the tub, filled it, it has been 5 days now and the water temp went from 43 to 66 in the first day and then 66 to 73 in the next 4 days. The readout shows FLO. I have tried 2 of the suggestions to eliminate an air pocket but it doesn't seem to be working. Any suggestions?
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Answers & Comments
FLO = It typically for a Flow Switch or pressure switch (heater is deactivated. Pump may also be deactivated).
It is most likely a flow/pressure switch failure.
Before you buy a replacement try running the spa with out the filter cartridge - Checking if dirty cartridge is the issue. Also check that all gate valves are all the way open & locked.