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Old 07-13-2018, 07:48 PM   #11
travelin texans
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If you are unable to clear the sensor by any of the methods mentioned on here, personally I wouldn't take it to a dealer & waste prime camping opportunities waiting on them to do the same procedures that will only help til you fill the tank again.


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Old 07-13-2018, 10:19 PM   #12
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We have a 320RS which is almost the same as the 321 and have the same tank sensor panel. What sourdough mentioned is correct, there is no second black water tank so ignore BLK #2. If your #1 tank is always showing 2/3rds full, then I agree itís probably a sensor problem.

You might try flushing the tank. TP and other crap (literally) gets on the sensors causing them to read incorrectly. Also, never keep the black valve open even if you are hooked up to a sewer. Always let the chemicals in the tank do their job and only dump the Black tank when needed.

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Old 07-14-2018, 03:51 AM   #13
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Black tank

Yo might want to try using the geo. system to clean the black tank and sensors.
I have used the system on the last two tt and it works.
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Old 07-14-2018, 08:06 AM   #14
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I just purchased a Cougar 303RLS with the same panel showing 2 black tanks and the unit only has one. My one tank always shows full and the other seems to function properly. I originally thought I might have 2 tanks but it does not and the ghost tank sensors never change from showing full.

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tank, water

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