Could be sensors are clogged with accumulated gunk. Suggest trying either chemical sensor cleaner, available at RV supply store, or a power flush from the top through the toilet with a spinning, black tank flush tool which attaches to a hose through the bathroom window, also available from RV Supply Store or RV Dept at Walmart.
Rexhall Waste Tanks Access
in Water and Holding Tanks
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Could be sensors are clogged with accumulated gunk. Suggest trying either chemical sensor cleaner, available at RV supply store, or a power flush from the top through the toilet with a spinning, black tank flush tool which attaches to a hose through the bathroom window, also available from RV Supply Store or RV Dept at Walmart.