Hi, I have a 2002 Clearwater Spas St Andrew, it has 2x 3HP Waterway pumps (2-speed, 3721221-1D) and a Balboa SUV M7 control board. Pump 1 acts as circulation pump on low speed. Pump 1 recently failed, which also popped one of the two 25A TD Fuses on the board.
I replaced Pump 1 and the fuse with new units, but the pump will not come on in low-speed mode, which is what circulates the water through the heater, so the spa is still unusable. You hear the board relay click when the low-speed should come on, but nothing happens. It works fine in high speed mode. If I swap Red and Black, it wi