Maybe it uses a seawater cooled compressor-heat exchanger. And somehow when the compressor runs, it has a cracked section and somehow it fills up the drain.
OR maybe the seawater cooled heat exchanger, the flow backs up and comes into the fridge cause the outflow is partially blocked. Perhaps the pump outflow shares the same drain as the fridge. And maybe it is designed to do that to show you there exists a problem with a partially blocked drain where the heat exchanger outflow is not draining properly. Tubes can fill up on the inside with stuff.
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