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I have a 2003 Jacuzzi hot tub, model J-355 and it will not heat up past 81 deg. F The topside control panel continuosly flashes between FLO, Cool and the temperature. I replaced the flow switch after reading articles about FLO errors. After replacing the flow switch, I continue to get the same error message. I have checked the filters and cleaned them out. There is enough water in the tub and both pumps are running. Could the heater need replaced? Or what else could be causing the error message.