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Old 09-06-2016, 01:04 PM   #1
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Question black water tank sensor

the sensor for our black water holding tank ALWAYS says 1/3 full. we have cleaned and flushed several times to clear it but no success. can anyone tell me what else I need to do or can do to clear this sensor. I have a 2014 V-Cross 315. Thank you for any and all help!!
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Old 09-06-2016, 01:20 PM   #2
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Does it ever say 2/3 full or full? Or does it always just stay at 1/3?
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Old 09-06-2016, 01:20 PM   #3
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I have the same issue.
I have tried the calgon stuff. It helped some, went down one bar.
Add 5 gal of water next time you drive to your park. it may move around and free up or clean up.
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Old 09-06-2016, 03:04 PM   #4
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Originally Posted by nomad297 View Post
Does it ever say 2/3 full or full? Or does it always just stay at 1/3?
Yes It does go to 2/3 & full. Would love for it to say EMPTY when it is empty.
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Old 09-06-2016, 03:05 PM   #5
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Will deffinatley try the 5 gal of water when we go next. THANK YOU so much.
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Old 09-07-2016, 12:20 PM   #6
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You can pull the sensor out and clean it. That should fix the problem. Had to do that with mine once.
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Old 09-07-2016, 12:29 PM   #7
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The problem is usually film between the probes, not on them. Try s high velocity water jet cleaner rotate and change levels, have someone read the lights as you clean.
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Old 09-07-2016, 12:31 PM   #8
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Black Water Tank problems

Let me pass along an old "remodeler's trick". After dumping and flushing your tank, add a couple gallons (2) of clear water and then add one gallon of vinegar. Drive home as normal and allow it to swish around in there and then dump it again near home. Should solve your problem. We've been using this system for years, both on our rig and restoring previously "used" toilets most people gave up as lost... saved thousands of dollars over the years... which helped pay for the new RV!
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Old 09-07-2016, 12:48 PM   #9
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If the film wasn't also on the probe it wouldn't make contact. Cleaning will help.
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Old 09-07-2016, 02:42 PM   #10
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I had/have the same problem it has been to the dealer to fix and that is the only time other than when brand new that I read empty, I have back flushed and back flushed and it still reads 1/3. I quit carrying and know it's empty even though its 1/3. I have done the 5 gallon thing and always the same
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Old 09-07-2016, 03:07 PM   #11
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The problem is most likely your probes. A film develops on them and causes them to sense water where none exists. You can take them out and clean them but the problem could also be a bit of toilet paper over the end of the probe causing them to once again, sense water where none exists.

On an older camper I had I changed the probes out. System worked perfectly til the film migrated down onto the probe from the wall of the black tank and once again, it was always 1/3 full.

I think the definitive answer is to change the probes but use the Valterra probes. They come with a shield on the top to protect the probe from toilet paper and the film sliding down the tank.

Here is a link to an eBay auction showing the probes. Im not advocating that you buy these, SHOP AROUND for them but they have a good photo of the probes. It IS NOT my auction either.

Valterra T21301VP Tank Probe Black Water 4 Pack | eBay

I know I protest too much but I don't want someone to accuse me of trying to sell you something when it is not true.

Good Luck!
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Old 09-07-2016, 03:14 PM   #12
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sometimes a good blasting is the best way to clean off the contacts, the link below is of a gadget that is designed for doing just that,....... stick it into the tank, point in the direction of the sensors and blast away,...... it might help

https://www.amazon.com/Valterra-A01-...amco+tank+wand
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