gray and black tanks don't register on panel

[drron]

I have a 2006 Lexington GTS, everything registers on the panel except the black and gray tanks. Is there a fuse somewhere for those 2 tanks?
Thanks

[RickLSmith53]

I was having trouble with my black tank never changing from 1/4 full. So I dumped 2 large bags of ice down the toilet, added some water, and went for a swishy ride. The ice cleaned my sensors and all is well now. I have added a black tank flush kit since then.
Rick Smith

[drron]

Good idea, I had a bad circuit board in the control center.
The manufacturer sent me a new one for $29 , installed it myself and saved an expensive trip to Camping World repair shop