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Old 10-24-2022, 09:07 AM   #1
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Grey tank sensor way off after maintenance

Last week we were spudded in Raleigh from Sunday to Saturday. The grey tank levels were acting normal, which meant that it would show 0 bars for the first day that included showers, dishes and maybe 1 load of laundry.
On Wednesday we came back from a walk and water was pouring out the wetbay. I looked up into it and could not find where the leak was, but it seemed to be isolated to the wet bay. No water in the coach.
Called RV maintenance and he came out and stopped the leak. He stated he had to take out the grey tank to get to them. Seems somehow an overpressure in the system caused at least 1 hose to let loose and a few others are leaking a idea how this happened as we have a regulator on the line.
Any ways, the issue I am seeing now is that the grey tank now shows 1/3 bar when empty. When I empty the tank and it is moderately full, it empties with it's normal gusto filling the sewer hose with little noise, then the gurgling at the end.
Now it shows the 1/3rd bar when empty and 2/3's full very quickly.
What could have happened? This is seriously annoying for boondocking where I rely on knowing what I have and when I have to think about dumping.
Is there a way to recalibrate the system?
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Old 10-24-2022, 10:07 AM   #2
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Post your year and model. There are different sensors for different models. The most apparent cause would be the tech either damaged the wiring or moved a sensor. Some tanks have interior sensors, others have exterior sensors.
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Old 10-24-2022, 10:26 AM   #3
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Sorry, It's a 2016 Open Road 34PA.
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Old 10-25-2022, 09:51 PM   #4
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The measurement that you describe is what we got from day one. We had a see level monitor system installed and are very happy with the result. At least on our coach, the tanks will not empty. Looks like 25-35% of the tanks capacity remains after a dump. The solution is reported to be to drop DS and raise PS, but that method has not functioned for us.

The Seelevel monitor at least gives us a measurement we can use to monitor tank fill status. Note the Seelevel is a % measurement and not a 1/3 - 2/3 - full measurement as originally installed.
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grey tank, maintenance, tank

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