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Old 09-15-2024, 09:45 AM   #1
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Default Black Tank Sensor

Have a 2018 21RB. After I drain the black water tank and flush it all very well with a hose, it reads empty. After one day at the campground and only using the toilet to pee in maybe 6 times, the sensor shows full. Then I dump and flush it out and it shows empty. Is this typical of a bad sensor and if so, how hard are they to change out? I have the climate package so it has the think hard insulation blanket on the under carriage. Thanks all!

Oh and I did use the cleaning solution called CleanIt and let it sit in there for about 4 days and after that it showed empty so I thought I had it fixed but that didn't work either.
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Old 09-22-2024, 11:43 AM   #2
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Black tank sensors are notorious for erroneous readings. Besides the obvious, paper and other debris sticking to the sensors, they can rot/corrode/break.

Quite honestly, I don't know too many RVers that rely on the panel readouts for a black water tank. Grey tanks maybe.
Looking down through your toilet with a flashlight is probably the only true way to tell!
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Old 09-23-2024, 04:02 PM   #3
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I installed a Garnet SeeLeveL tank level monitor system on all three holding tanks. No more level monitoring problems.
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