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    Marquis spa Costal series won’t heat unusual circumstances

    Hi guys, I just bought a home with a Marquis Costal series Spa (see attached pictures). My issue is with the heating, I set it to 104F but it only heats to ~94F. In addition, it cools down while we use it to below 80F and the heater does not activate. I have checked the following: 1. Heater...