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Old 09-29-2015, 03:13 PM   #1
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Holding Tank

I have a 2005 Holiday Rambler Endeavor, 38.5--My black holding tank has been reading 3/4 ful for some time now-was told it was a bad sensor, but after it was installed that was not the problem(shows 3/4 when we know tank is empty) Old home tale was to put ice in the tank with water and go out and drive around, and the movement might clean what ever is down there causing the problem--did this and it still reads 3/4 full--by the way , when they switched the sensor to tank 2, it also read 3/4 full, and that was the reason they felt it was a bad sensor--new sensor did not make any difference--any suggestions.
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Old 09-29-2015, 03:45 PM   #2
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what is a "sensor" in rv tanks? it's just a bare metal post. when the waste water gets to the level, the continuity makes the pair connected thus your light turns on. in that sense, "sensor" will not fail cuz it's made of stainless steel. the only times it is "bad" - 1) the probe is covered with waste, well, you got it, the ice-cube/driving-around does the trick; 2) bad connections. in this category, there are two possibilities - a) the wire contacting the end of sensor gets rusted. this one is an easy job - unscrew, sandpaper contacts. b) the upper end of the wires corroded. well, it could be on the immediate up-end, or the next up-end... you need to trace up to where the wire goes to and de-oxit the contacts. normally b) is a harder one.

to pinpoint the problem, you may use a jumper wire to connect couple contact points, one at a time. any experienced rv tech should do this first. good luck.
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Old 09-29-2015, 04:05 PM   #3
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I am not an expert but if the water level contacting a probe lights the level indicator then if you disconnect the wire on the probe the light should go out. That is provided the probe is the problem. If it does not go out then it could be a shorted wire.

If it goes out get a tank flusher wand connect to a hose and insert in toilet and clean the tank. This worked for me.
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Old 09-29-2015, 04:26 PM   #4
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Quote:
Originally Posted by abbygirl View Post
I have a 2005 Holiday Rambler Endeavor, 38.5--My black holding tank has been reading 3/4 ful for some time now-was told it was a bad sensor, but after it was installed that was not the problem(shows 3/4 when we know tank is empty) Old home tale was to put ice in the tank with water and go out and drive around, and the movement might clean what ever is down there causing the problem--did this and it still reads 3/4 full--by the way , when they switched the sensor to tank 2, it also read 3/4 full, and that was the reason they felt it was a bad sensor--new sensor did not make any difference--any suggestions.
Story short, they are just another useless add on, whereas the money could have been better spent elsewhere.
Best thing for any black tank is to use plenty of flush water and dump often, like every 3 or 4 days for two people. This practice doesn't require any chemical additives either.
If a longer term is required, then use a flash light to keep a check on it after a week, so that you'll have time for getting to a dump station before it fills up. Keep in mind that if it fills to above the vent pipe and who knows how far it's down inside the tank, then be prepared for max ventilation of your RV and a few cans of air freshener, once you move the rig, if not sooner....
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Old 09-29-2015, 04:37 PM   #5
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On some systems there are "pots" to adjust the level readings. Our 2002 Dutch Star had that. Small holes just under the buttons were where the adjustment screws were "hiding" Once adjusted we didn't have anymore trouble but that system used sensors that stuck on the outside of the tank so they never got fouled with anything.
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Old 09-29-2015, 04:44 PM   #6
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FWIW if you are dealing with the screw through the tank sensor the contamination can be grease, scale or crud. Ice only provides some mechanical scrubbing. Using detergent will get the grease and probably the crud. It takes a mild acid to get scale.
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Old 09-29-2015, 05:32 PM   #7
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abbygirl-

Here's another current iRV2 thread on the same topic:

Black and Grey Water tanks reading empty but they're not!

My post is #19 (no need to repeat it here).

There are alternative systems, such as the Garnet SeeLevel II, that don't use contact sensors and so are less prone to incorrect readings. I've read that severely "crudded-up" tanks can flummox even these systems. So, in the end there's no substitute for clean tanks.

Mark
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Old 09-30-2015, 10:39 AM   #8
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Some Dawn dish soap, 3/4 fill of black tank with water, go for a drive with lots of turns.

Dump the tank.

If this does not work, do it again......
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Old 10-01-2015, 03:02 PM   #9
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Thanks to all who responded to the Holding tank issue--will give some of your suggestions a try.
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Old 10-01-2015, 05:40 PM   #10
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If you have a tank flush, flush several times and fill the tank to at least 3/4 full ( i time mine @ 1.5 mins) between each flushing, then repeat, repeat, repeat. Then recheck your level indicator. Possible materials (if you get my meaning) are on probe, so flushing may remove them.
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Old 10-01-2015, 06:56 PM   #11
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Google, recalibrate rv holding tank monitor, will show how to adjust some monitors.


Sent from my iPhone using iRV2 - RV Forum
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Old 10-01-2015, 08:35 PM   #12
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Had the problem in my 2005 dolphin, called monitor panel company and he said cut the wire going to the panel. If it does not read empty the circuit board is bad. I replaced circuit board and it works like New.
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