When, if ever, was the last time you cleaned the electrode pack (which does NOT require opening it up...see owners manual for instructions)?
Sea water mineral up on the electrode pack "insulates" it, reducing the voltage. Because warm waters have a much higher mineral content than cooler waters, it may be necessary to clean it every few months.
If that's not the problem, I suggest you call Mac McCoy in Raritan's Ft. Lauderdale plant 954-525-0378 He's become my "go to" person at Raritan since Vic Willman retired.
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