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Our Model year is 1998 or 1999. Thanks for the suggestion about the filter. It started working again, probably worked for a week with no errors, but then today the problem returned. Have more insight into the problem. When The pump is off, it is giving us a FLO error, and the heater will...

Thanks for the suggestion. Unfortunately, I checked the user manual and there's only 1 big cartridge filter.

Hi, I tried looking for a search function on the forums, so sorry if it has been asked before. We bought a house a month ago with this hot tub. Worked great for the first month, now we get an OH which says heater is deactivated overheat protection, and a FLO (heater is deactivated, pump may...