If you have "no" light then the SWCG is not getting power from its power supply.
I would suspect the fuse in the bottom of the power supply enclosure.
Your pool builder did you no favors installing it that low to the ground as it will be pain to get to..
If the fuse is good and you have AC power getting to the power supply then you would need to check the DC voltage in the power supply that is being sent to the cell. Should be about 35 volts or so...
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