I've tried everything here. Topside panel heat light is on. Replaced blower, pump, pressure switch and heating element over the winter. Spa wouldn't heat, had board checked out and a relay was bad. Replaced relay, still no voltage at heater. There is voltage coming into board, blower and pump both work. What could be causing the heater not to get voltage? Thanks in advance.
Great Lakes spa, Balboa 410e circuit board.