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Balboa vs510sz board extender voltage fluctuating
bradivy posted a topic in Portable Hot Tubs & Spas
My spa has been working fine until the other night. It has a Balboa VS510SZ main board with the extender board (53544) for a second pump. While both pumps were running, pump 2 started turning on and off and an audible clicking was heard from the board. The next day I was able to track the click to the relay on the extender board. At first I thought the board or relay was shot, but dug a little deeper. I removed the small gauge red and white wires that come from the extender board to the J60 numbered connection on the main board ( I assume control power for the relay and there for the extender board?) I put my multimeter on the posts the wires came off from. The voltage is surging. I don't believe my multi meter is fast enough to report the true values, but the low side is 12v, on the high side it gets up around 20-22 then drops. I believe the extender board is fine but this variation from the main board is "telling" the extender to cycle on and off. Does anyone know what to check / replace on the main board to hopefully resolve this issue? Thanks in advance for any advice.