Thanks, again. It is really awful nice of you to take the time to consider my questions and problem I'm having, and I greatly appreciate your generosity and expertise: The original board lasted me 24 years!!...but the relays on the board, which occasionally burned out, had been replaced by me numerous times after 1] years of heavy use 2]in Florida humidity 3]outside in a hot tub, when the original relay's manufacturer stated that they were not rated for 'outdoor use'. (!!) The board had so many oxidized solder points that when I cleaned the spa in Sept and turned it back on after a couple weeks in October and the only sign that it even had power was a single buzzing relay---I decided it was time to find a whole new board. My best info right now is 1---a bad board 2---possible heating coil ground fault 3--any other suggestion you have. THANKS AGAIN!