Thanks for the update. Before you replace the control board consider consider trying a couple of cheap repair ideas. Can you see the control board? If so, determine if there are fuses on the control board. Also, there may be lights on the control board. They will be identified by a location ID. Document which lights are on/off and what color they are.
If there are fuses, replace every fuse. Even if the fuses check okay, replace them (another long story). If replacing the fuses and ground wire do not fix the problem, call HWH at (563)724-3396 or (800)321-3494. Their telephone support is excellent. They will lead you to a fix.
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