HELP!!! Being a "newbie", I am becoming increasingly frustrated by a sensor that is constantly reading "2/3 full" on my black holding tank. I KNOW I have emptied it until nothing trickles out, and have also back-flushed with the hydro-flusher until it runs clear, and the dang thing still reads 2/3 full. The trailer is a Citation 33ft with 2 bathrooms, the one set of holding tanks reads properly. Much thanks to those that can offer assistance!!
You may be experiencing some toilet paper hang up on one of the sensors. Or it could be a sensor that needs cleaning. If, you are sure the system is clean. Go buy one of the wands, and spray in there real good, and then check it out. If this does not work, hitch everything up first, and put a couple gallons of fresh water in the tank, then pour about 3 big bags of ice in your tank, and go for a spin. The ice should free up any paper and clean the sensors. If this does not cure your problem (which 90% it does) then you may need to replace a sensor.
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I also heard from someone on a different forum, (sorry can't remember which one) that certain chemicals can actually corrode the sensors. I hate to say, at the time I didn't have a TT and wasn't concerned about the problem, now I wish I would have written it down or remembered. Sorry!
But you might check with the RV Dealer and see if the checmicals you are using are suggested for your type of system.
And I have heard of the ice trick several times, so it must work.
My experience is that you'll spend more time trying to make those gauges work than is worthwhile. You can see how full the black tank is just by looking into the toilet as it’s flushed. It's also pretty rare to fill the black water tank unless you are dry camped for an extended time. The only value these sensors have are selling features for the dealer. They are cheaply built and rarely accurate enough to rely on.
If you're not hooked up to city water; that is your using your fresh water tank as a water supply, then when the fresh water tank is empty - its time to empty the gray water tank.
If you're on city water and using the holding tanks, then I'd buy one of the portable tanks available from camping supply houses and drain the gray tank every other day or so. How often you need to empty the tank depends on your water usage. I rarely need to empty the gray water tank over a normal weekend; however, I will need to if I stay a third day.
It’s important to coach the family about frugal use of water when using the holding tanks. Also teach them to stop using water immediately if the drains don't appear to be working. It’s not too hard to empty 20 gallons of water out of the gray water tank into a portable tank when necessary, but it's tough to clean up the mess when the shower runs over.
We had this same problem on trip to Florida in August. I got kind of worked up and wondered what was going on. I crawled underneath and tapped on the tank and it was empty.
I'm sure the false reading was caused by condensation in the holding tank fooling the sensor. This has happened a few other times under the same conditions.
A couple tablespoons of vinager in the tank will clean the corosion off the sensors. The ice works great if there is tp, celery strands etc on sensors. One trick I learned a long time ago; is to pour dishwater in toilet (small dish pan) to aviod filling up grey tank and allow more liquid in black tank. We even do this when on full hook-up. The suds does wonders.