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Old 10-05-2014, 05:47 PM   #1
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Default Monitor panel for tanks not working

I know I've seen this discussion on here somewhere, but can't find it.

For the last 5 dumps, the indicator lights don't move. They don't indicate the two tanks are empty. I've been over bumpy roads, but it didn't help. Any other ways to get it working again?
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Old 10-05-2014, 09:46 PM   #2
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Default Re: Monitor panel for tanks not working

Can you try filling them up and adding some bleach to the water, drive the van around for a while, then dump them, and wait for a day or two. If there's a way to allow air to get at the sensors to dry them, that might help. It's not always the sensors not working, but clogged with leftover wet waste that makes them register full, when you know they're empty.
Inexpensive, and worth a try?
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Old 10-05-2014, 10:48 PM   #3
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Default Re: Monitor panel for tanks not working

Some people use a bit of Calgon Water Softener and do the rest as Mike described.
I've had sewer connections at home and I'd dump the tanks normally then refill with water and dump again and that usually cleared the sensors.

You can buy a flexible wand for cleaning the black tank that attaches to a garden hose. You insert it into the black tank via the toilet. It has a spinning attachment head that shoots jets of water that help to clean the sidewalls of the black tank. Not the most fun job .....
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Old 10-06-2014, 03:36 PM   #4
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Default Re: Monitor panel for tanks not working

Since suggestion 1 is the easiest, I'll try that first. Thank you so much.

If that doesn't work, I'll resort to suggestion #2.

Didn't think about the senors needing to dry out.

Thank you both.
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Old 10-08-2014, 08:49 PM   #5
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Default Re: Monitor panel for tanks not working

I had read that putting ice cubes in the black tank and 3/4 full of water and go for a drive that the sloshing effect of the cubes can sometimes help clean off the tank sides as well as the sensors worth a try.
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Old 10-08-2014, 09:06 PM   #6
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Default Re: Monitor panel for tanks not working

Someone on YouTube busted most of the theory of Ice Cubes in the tanks. The one thing the ice cubes did manage to clean was the sides. It did not clean the bottom. That may just work in this situation.
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Old 10-08-2014, 11:00 PM   #7
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Default Re: Monitor panel for tanks not working

What it takes to clean out your tanks largely depends on what you put in them regularly. I don't have any stats beyond word of mouth, but we've met quite a few owners who only use their black tanks for liquid bio - waste. I think that simplifies cleaning them up when the sensors start reading full when you know they're empty. I generally only use either bleach or vinegar to clean out the plumbing depending on whether we're on our way out, or just returning. Bleach has its obvious disinfectant properties, and vinegar can help break up calcium and lime deposits in the tubing and water heater. We also use regular formaldehyde free tank treatment to control any odor.
And no, not at the same time.
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Old 10-08-2014, 11:16 PM   #8
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Default Re: Monitor panel for tanks not working

The contents of your waste tanks should be irrelevant to bathroom odors. If you bathroom smells, either it needs to be cleaned, your tanks are not properly vented, you are not keeping water in your toilet and/or traps, or you have a leak somewhere.
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Old 10-08-2014, 11:47 PM   #9
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Default Re: Monitor panel for tanks not working

Wow! Sounds like you've run into a few smells out there? Thanks for the input.

My point about contents was more in relation to cleaning sensors. Nothing to do with odors.

Actually, we've never had any odor problems, so it must all be working.
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Old 10-09-2014, 06:00 AM   #10
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Default Re: Monitor panel for tanks not working

Repeat after me:
"RV tank sensors are unreliable"
"RV tank sensors are unreliable"
"RV tank sensors are unreliable"

It's wasted energy trying to get them to work as advertised!
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