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Old 08-05-2018, 05:31 PM   #1
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Default False Readings on Black/Grey Water Tank

I bought a new 2018 Carado Banff in July, and so far, I've taken it on one long trip. The gauge on my Black/Grey water tank got up to 2/3. I dumped it, but it stayed at 2/3. Yesterday, I filled it with water and dumped again. It still reads 2/3 even though I know it's empty. I tried a couple of Valterra devices. The first was a wand to spray the tank from above, but it won't go down the toilet or the drain. The second attaches to the black tank drain with a hose attachment to spray upward. So far, neither of those has worked. This appears to be a very common issue for RV owners. I see various products which say they can help, such as Happy Campers Extreme Holding Tank Cleaner. Some people add ice or water and drive around and then dump. I'm assuming that something is blocking the sensor and making it think it is 2/3 full when it isn't. Can anyone suggest a reliable solution or should I just live with a tank with false sensors?
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Old 08-05-2018, 06:32 PM   #2
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Since your unit is new, why not pursue a warranty fix?
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Old 08-05-2018, 07:20 PM   #3
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Hymer / Roadtrek might be using the most basic probe type tank level monitor system.

They can get fouled up from gunk but I wouldn't expect it after just one trip and after a complete flush out with fresh water.

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............. Yesterday, I filled it with water and dumped again.
Did you see if it read full after filling it? If it didn't change then maybe the probes or wiring or both were not correctly installed.
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Old 08-06-2018, 12:51 PM   #4
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I hate to break the news but this is an almost universal complaint among RVers. Manufacturers should have taken the hint years ago and moved on to a more reliable system. The best I have heard about is the “SeeLevel” system which does not touch the interior of the tank.
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Old 08-06-2018, 01:17 PM   #5
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I wish I had a dollar for every new RV purchaser who posted this question. The only time I have had a black tank that correctly read empty was the day I took them off the sales lot and it had never been used. One it was full... it always read 2/3 to full. This has been true of all three of my RVs... over 14 years.

With my first rig I tried all the advice... ice cubes... various different chemicals and cleaning options. And never putting toilet paper of any sort into it. Didn't matter... was still invariably wrong. Actually my first one did read empty once, but I knew that it was full. After a few months, I now only read the black tank gauge if I need a laugh.

But, with regular use, you begin to know when it is full.
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Old 08-06-2018, 01:26 PM   #6
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You do hear about problems with that basic probe type system but you don't hear about all of the relatively problem free good systems out there.

Winnebago uses True Level and that is a step up from the probe type systems. https://winnebagoind.com/key-feature...ures/truelevel

I'd think that Tank-Edge by Tech-Edge https://tankedge.com/index.html would have accurate systems. In addition to new systems they support older monitoring systems manufactured by Snake River Electronics, Geckotec or Larson Electronics. They sometimes have an Acu-Gage label or coach manufacturer label.

I find that old no probe system to be accurate and you can easily calibrate it yourself. The end user calibration allows for customization. In my Class A, I set the 40 gallon grey waste tank to show Full at the 30 gallon point. That allows two more showers or so before it is a must dump situation. I have the propane level set more or exact. The black tank is set to the Full light coming on at 34 gallons - only 4 gallons less than actual full capacity.
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Old 08-06-2018, 01:52 PM   #7
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I'm lucky with my 05/04 Roadtrek 190P back and gray displays. They are lousy, but when I did the math concerning all the tank sizes I did not need either the black or gray displays. When I stop, it is because I need fresh water and dump too without any risk of either tank being full.

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Old 08-06-2018, 02:49 PM   #8
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Over many years of RV'ing in different RV's, I have just learned to live without them - mine have always been nothing but a frustration

- now water from tap? fresh water tank empty.
- grey water backing up in shower? dump grey tank.
- look down into the toilet tank, level high? dump black tank.


These are extremes of course and I rarely get to this stage - you soon learn typically how many days you can go before you will be getting close and arrange accordingly.

In the past my experience has been mostly with trailers, I am thinking that with the "B" van we have on order, things should be even easier. What I mean is that if we don't have hookups and our site, well, we will likely be going out in the van at least every coule of days if not every day, so just a quick stop at the dump station on the way in or out should be no big deal even if not entirely necessary.

Just my thoughts! ................. Brian.

PS - I thought some of the newer systems had probes that were actually outside the tank wall and still sensed the level inside. if that is so, I would expect those ones to be much better.
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Old 08-06-2018, 02:51 PM   #9
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With a combined black/gray tank you'd never want to experience waste water backing up into the shower pan when showering. That's a gross enough experience when it is only gray water!
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Old 08-06-2018, 02:53 PM   #10
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Quote:
Originally Posted by markopolo View Post
With a combined black/gray tank you'd never want to experience waste water backing up into the shower pan when showering. That's a gross enough experience when it is only gray water!
Agreed! never had such an animal!

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