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Old 07-04-2013, 11:20 AM   #1
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Black Water Indicator ALWAYS reads full

We bought a 2008 Lexington 283gts back in Feb and all of the water tank indicators appeared to be working ok. We have used the RV several times but now the Black Water light on the Info panel always reads full even after it has been completely emptied. The others are all ok. What is wrong with the black tank sensors and what can I do to give the black water tank a good flush? Thanks
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Old 07-04-2013, 11:57 AM   #2
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I've got the same issue. I assume some TP or something has attached itself to the sensors.
I plan to make a wand out of pvc to attach to my hose and shove down the toilet to 'presure wash' the tank. (glue cap on 2' of pipe, put hose connection and valve on end. In the cap drill small holes for the water to come out in all directions)

I''ve not researched it, but just general reading here seems to indicate one shouldn't dump the tank until it's 3/4 full...I know I break that rule - I'm just not gonna park my camper for weeks with poop in it, sorry, just not gonna happen.

Read also that before a drive dump a bag of ice cubes in the tank and make sure you've got 1/4 tank of water in there and the cubes will 'scrub' it clean. If ice weren't $5 a bag here I'd consider that...if i don't get my wand built by sat PM I'll be doing the ice thing when we head out!
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Old 07-04-2013, 12:20 PM   #3
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Prof_fate, It's very important to have your black tank near full or at least the 2/3 to 3/4 recommended level even if you need to add water to bring the level up before dumping this way you get a larger flow rate out the drain to move undigested poop out the drain line or over time you can accumulate a pile in there that becomes more difficult to get out, and I'm with you I am not about to leave a partial tank sitting there for more than a few days.
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Old 07-04-2013, 12:33 PM   #4
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Dumping any tank <2/3 full is a bad idea. I always try to fill each tank before dumping. If at a dump station and no one is waiting, I will refill the black or use the internal wash-down fitting to give it an extra fill and flush. You must have the almost full tank of water behind the rest of the "stuff" to get it to exit the tank. Yes, anything sticking or hanging on the sensor will give a false reading.
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Old 07-25-2013, 12:06 PM   #5
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You can buy generic OxyClean from the Dollar Store for $1.00 a can. After dumping and flushing your tank, and prior to road travel, put 1/3 of the oxyclean in 1 gal of water and add to your tank. The travel movement will slosh the cleaning solution and the oxyclean will clean the sensors. It may take a few trips to get it clean if it is really dirty, but then just do it every time you empty the tank. A little calgon water softener also helps, but it is not essential.
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Old 07-25-2013, 12:12 PM   #6
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Quote:
Originally Posted by BigTJohn View Post
Dumping any tank <2/3 full is a bad idea. I always try to fill each tank before dumping. If at a dump station and no one is waiting, I will refill the black or use the internal wash-down fitting to give it an extra fill and flush. You must have the almost full tank of water behind the rest of the "stuff" to get it to exit the tank. Yes, anything sticking or hanging on the sensor will give a false reading.
true. mine indicates whenever I dont let it fill almost all the way..
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Old 07-25-2013, 12:49 PM   #7
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I use approx. 2 cups of Super Clean and some Pinesol and have not experienced any problem with the sensors. We don't put paper in the commode either.
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Old 07-25-2013, 12:53 PM   #8
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We don't put paper in the commode either.
No paper in the commode?
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Old 07-25-2013, 12:57 PM   #9
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No paper in the commode?
No.
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Old 07-25-2013, 01:05 PM   #10
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We got one of these:
Camco 40094 RV Swivel Stik Holding Tank Rinser with Shutoff Valve : Amazon.com : Automotive
Have yet to use it...same problem. I guess it makes sense that sensors need cleaning occaisionally.
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Old 07-25-2013, 01:48 PM   #11
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RnS, if OC puts paper in the commode, how else is one able to recycle it? You know you have read on the container - 50% or more "post consumer waste"!!
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Old 07-25-2013, 01:51 PM   #12
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RnS, if OC puts paper in the commode, how else is one able to recycle it? You know you have read on the container - 50% or more "post consumer waste"!!
OC & TOWTA do NOT put paper in the commode.
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Old 07-25-2013, 01:53 PM   #13
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I saw a video on YouTube that says to use liquid dish detergent as it is made to get grease and such off. I need to do the same thing as my blackwater tank always reads 1/3 full. Though it is brand new (used twice when it started) and I don't think I could have gotten something on it. The same video mentions calibrating the sensors so after I attempt to clean them, if that doesn't work, I will have to look into calibrating them.
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Old 07-25-2013, 02:10 PM   #14
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I saw a video on YouTube that says to use liquid dish detergent as it is made to get grease and such off. I need to do the same thing as my blackwater tank always reads 1/3 full. Though it is brand new (used twice when it started) and I don't think I could have gotten something on it. The same video mentions calibrating the sensors so after I attempt to clean them, if that doesn't work, I will have to look into calibrating them.
X2 i put it in with a couple gallons of water when on hit my lady camp ground and i am on my way home. Never had any problems with any of my sensors on any of my trailers
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Old 07-25-2013, 02:11 PM   #15
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I am always surprised the GEO Method doesn't come up immediately on these issues.
Also, is paper that big of an issue? I believe that the septic safe types that break down quickly are OK in small quantities. Seems like the other "solids" are a much bigger risk of causing issues.
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Old 07-25-2013, 02:34 PM   #16
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The problem with the Camco wand is that on the 320rs it doesn't reach the tank because of bends in the plumbing. You can only use it to rise the toilet drop pipe down to the plumbing pipe.
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Old 07-25-2013, 08:53 PM   #17
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Quick dissolving toilet paper is a joke. Don't believe me, put the paper you are using in a glass full of water. I'm using Camco RV toilet paper. After letting the glass sit for 1 week, the paper is still whole and did not dissolve at all.

However, when you swish the water around in the glass, then the paper turned into a slurry. So lesson learned, RV toilet paper stuck on a sensor does not dissolve all by itself. It has to be under water for days and then get rinsed off, sloshed around by trailering, etc.

Do the RV toilet paper in a glass test yourself. You will be surprised at what does and doesn't happen.

On a Columbus 320RS, (what I have also) dump the black tank, close valve, fill it up all the way full with black water flush. Then dump it again. Sensors should be clean and read empty. Still no luck, rinse and repeat. When tank is clean and empty, close valve. Then I dump kitchen gray - the handle by the hose hookup. Then I dump shower gray - the 2nd handle in water controls compartment. The shower gray tank is full of soapy water and it will help to flush sewer lines and hose.

When I follow this procedure, the LED lights ALWAYS show empty. I also know that full on the LEDs is not all the way full. So when rinsing black tank, when full LED comes on, I let it keep going for another couple of minutes. I want those sensors cleaned off and the tank fully rinsed.
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Old 07-25-2013, 09:01 PM   #18
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There is an excellent video on how the probes work and why they indicate badly.




Horst Miracle Probes Demonstration - YouTube

Here are two threads that tank about the system and the probe install

Horst Miracle Probes Demonstration - YouTube

http://www.forestriverforums.com/for...ion-16089.html
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