I have a 2007 Clearwater Resort Cabo Signature Spa with a Balboa control board (CL2007U EL2M3). Topside says "SNB". I swapped sensors A and B, no change. I installed a spare sensor I happened to have (replaced a heater a few years ago, it came with extra sensors), no change.
Is there any remediation short of buying a new board? Not easy to find this specific board!!
