Hi: gbaglo...I believe the contact points of the level indicators, in the side wall of the freshwater tank, may be rusty. All 4 are usually just screws thru a wire connector and screwed into the wall of the tank, where the water can touch them. Might be a good place to put some S/S ones in. The top one might be too high also. Hope this helps... I could be "all wet" on this problem too!!! Alf
escape artist N.S. of Lake Erie
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