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    Help - 2004 Sundance Marin 780 FLO (not heating) Error

    Hi all, Looking for help with diagnosing why my tub wont heat past ~60F. Error is a blinking FLO that is alternating with 'COOL' and the temperature. All pumps/jets/ozone bubbles seem to be operating normally. The FLO switch closes (and stays closed) when the tub gets power, and opens when the...