Hi you might go to
https://www.trbowlin.com/2021/01/28/...s-not-working/ and watch his video about maintaining your holding tanks he addresses the issue of sensors not reading or not reading correctly and offers a solution which seems to work well....you can also download the information which I did and I carry it with me.....one thing he talks about is getting rid of the smell from the toilet by using borax powder soap and dawn dish liquid in your black water tank then using some ZEP heavy duty citrus cleaner with some Boraxo in your toilet and let it works its way around the black tank for about five hundered miles or so, he swears it will get rid of the Poo Pyramid and clean the sensors....we have not been out enough yet to try it because our RV has been in the shop off and on for warranty plus wifey is healing from surgery, but soon and I will try it then....
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