That would also happen to our Black tank sensor..We do have the docking station and a really good flush, sometimes several and it would work normal. We dump and flush every day when hooked up and have not had that problem for a long time. Our galley tank was readin 2/3 full all the time. We gave it a good shot of dish wash fluid, Filled it up to where water stood in the sink..went out to dinner , came back flushed and all was normal and has remained so. Had the same sort of experience in our previous campers.
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