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Old 06-16-2016, 11:38 AM   #1
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Black tank - Always indicates full

Hello all...I haven't posted in here for quite some time now but had a question regarding the black tank. Even after having the tanks dumped, it will often read as being full...I know from past poster's that it can happen when the sensor in the tank is blocked. My question is this...what is the best way to try to unblock the sensor when my trailer is at a seasonal campsite and does not move?

I have heard people suggest adding a few buckets of ice to water in the tank and as you move around it cleans the inside of the tank or a few other ways to try to clean it out. My dilemma is that in this case the trailer is not moving.

Any suggestions would be appreciated.
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Old 06-16-2016, 11:45 AM   #2
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How about putting a few cleaning agents in there, fill it up by monitoring it, and let it sit for some time. Flush and repeat until it breaks free. If nothing rent camera and see what's going on in there.

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Old 06-16-2016, 12:02 PM   #3
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I do an initial drain then fill the tank again with water (almost full) then dump again. Keep doing this until it reads right. Works for me.
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Old 06-16-2016, 12:04 PM   #4
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You can also use a tank wand.
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Old 06-16-2016, 12:20 PM   #5
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Haven't tried it personally, but several people have posted that adding liquid fabric softener to the black tank seems to help "things" slip off the sensors. Personally planning to get a tank wand in my next Amazon parts order. I'm a gadget sucker...
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Old 06-16-2016, 12:29 PM   #6
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my tank is pretty small, so results might vary with bigger tanks, I tried the wand with 4 stationary holes, didn't do much, then I tried the one that spins and that fixed my problem.
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Old 06-16-2016, 02:39 PM   #7
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I have the same problem on the Seneca. I will fill the tank about 3/4 full with fresh water and drive around a bit. Maybe some dishwashing detergent as well. Let it slosh around real good for a bit, then go dump it again. Fill and dump several times ought to do the trick.
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Old 06-16-2016, 02:54 PM   #8
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You can do all of the above..... Or get a set of these Horst Miracle Probes and be done with it.

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Old 06-16-2016, 03:12 PM   #9
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Quote:
Originally Posted by TWP723 View Post
You can also use a tank wand.
+1 (I'm assuming there is no built in black tank flush?)
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Old 06-16-2016, 03:28 PM   #10
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Several buckets of hot water down the toilet with a couple of dishwasher soap packets....let sit for about 4 hours then fill black tank completely with regular water. Drain tank. Fill black tank again with fresh water and drain. Works on mine every time and the water on second rinse is always clear and sensors work great after that


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