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Old 11-07-2015, 09:16 PM   #1
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OK I give up.. Help Water issue.

OK folks.. 2006 navigator.. Initial trip. Started with 20 gallons in the fresh water tank. Got to rv Park. Hooked up water. Turned the valve to what we thought was, city water according to owners manual. No problem.. Until husband noticed a substantial drip from a black plastic pipe under the coach later in the day.. I turned on Aladdin system and to my surprise, it's showing 97 gallons of fresh water in the tank!!(100gal tsnk) ! Could dripping be an overflow for the fresh water tank?? We turned the water off!! Hubby ran four gallons into the gray tank (per the sensor), using water pump. Now tank shows 75 gallons of fresh water. This is making no sense to me. Any advise??

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Old 11-07-2015, 09:29 PM   #2
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Bad check valve or on some rigs a valve set to fill the tank rather than bypass the tank.

Gauges are well known for being inaccurate even if calibrated correctly.

2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft
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Old 11-08-2015, 05:38 AM   #3
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When you say "city water", I wonder if you are talking about a valve that on our coach is marked "City Fill". On our '06 Dynasty, the only valve in the service bay is the "City Fill" valve, and it does admit water to fill the fresh tank. So if you opened what I suspect is the only valve in the service bay, you did make it so that the fresh tank would fill.

The fresh tank does have an overflow tube as well as a breather tube on it. The overflow is to protect from overfilling. The breather is to admit air so water can be pumped from it without collapsing the tank. Both likely come out of the back wall of the tank, very near the top, within inches of the passenger side end of the tank, right in front of your passenger side drive tires. One line comes out of the tank and then splits into two, in that area in front of the tires. Water coming from that source is ok, but it does mean the tank is absolutely full.

Since you have the Aladdin system, you will find a pressure transducer on one of the walls of the fresh water tank. On ours, it is on the passenger side end of the fresh tank, right at the bottom front corner of the tank, behind the little heat exchanger for the basement compartment. You will see a phone type plug and cable leaving it to carry the data therefrom. That is a pressure sensor. It is possible that your fresh tank calibration may have been off, a bit. (You can fix that, yourself, if you choose to delve into it, but that's another story. The procedure is in the manual.) Let's assume that when it is indicating 75%, it is in actuality 100% full. If so, when more water is made available, to the point of going thru the overflow, that tank is becoming pressurized a bit. This is because the incoming flow is going to be more than the flow from the overflow outlet until the back pressure equals the incoming pressure. At that point, the tank is a bit overpressure. The pressure transducer sees that as an additional "head" of water, and reports the tank as being more full than it really is. (The same happens in the gray and black tanks, when they reach full and the water level begins to rise up into the internal drain plumbing and the roof vent pipes. So when you see those go higher than you expect, and likely quickly, be thinking about draining those tanks!!!)

Finally, Mr D is correct, if the "City Fill" valve is closed, as that can also cause the fresh tank to overfill. If the "City Fill" valve is open, as I think you said, it did fill directly from your incoming water line, as designed.

So, my suspicion is that all was as it should be, with the possible exception of the need to calibrate your fresh water tank sensor in the Aladdin. You can visually see the fresh water level in the tank if you open the basement door on the passenger side, just in front of the drive axle, and look under the black cover panel. That is also where your fresh tank drain valve is likely located. I marked the wall of our tank with a "Sharpie" at the level at which water just began to appear from the overflow pipe. With a measuring tape, I made marks at 25%, 50%, 75% and 100%. It's nice for a quick peek or verifying what the Aladdin is indicating.

Good luck with your new coach! You'll likely get some fantastic enjoyment out of it. You'll likely also learn a whale of a lot about the systems and features, and maybe how to use some tools you didn't know you needed. But that's part of the fun of owning one of these rigs. Enjoy!!
Jim & Angie, Boise, ID
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Old 11-08-2015, 06:25 AM   #4
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Thank you sooo much!! Yes I should have said "city fill". I suspect you are right about the calibration of the Aladdin so I will either tackle it or have an RV repair shop do it. Once we drained about 20 gallons out, the dripping stopped. We love this navigator but boy it is sure more complicated than our Winnebago journey was. And yes that's part of the fun. I learn something new everyday. Everyone here is so helpful!!!
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Old 11-08-2015, 06:37 AM   #5
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The fill valve handle on my Nav. was confusing to me so after I figured it out I magic marked the panel in a more clear and understandable way. Yes the Nav. has a lot of gizmo's and stuff. Some good, others not so much. Enjoy!
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Old 11-08-2015, 03:19 PM   #6
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After two hours of tinkering, we figured it out, and as mentioned, used a sharpie to mark the correct position of the city fill. We also know the Aladdin is off by about 25 gallons!!!! But in the process, we got the fresh water system sanitized and watered the front pasture lol. Will tackle recalibration next. Thanks for everyone's help!!!!

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