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Old 10-17-2020, 04:44 PM   #1
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2005 22' Interstate
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2005 Interstate Dump Valve Switch Inop/Stays Open

Hi All,

Searched and couldn't find answer for this particular issue.

Bought the 2005 AI used 2 months ago. Great condition and barely used with low mileage. Anyhow, first 3 times to empty the black and grey water (yes one holding tank) I did as I read and attached the stinky tube, stuck it in the dump station and then pushed the dump valve switch by the inner back door for 2 seconds. All good.

The next time I tried, I took the cover off the dump tube and had a gusher of black water. Didn't even touch the switch. So, I attached a valterra push/pull waste valve as a stop gap measure until I could fix the problem. I like the simplicity of doing this manually, but when attached the new valve adds about 3" sticking out the side.

I guess the switch left something open within the system. Not sure if it is a solenoid or what.

Any expertise help in troubleshooting with these older models is appreciated.

Thanks
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Old 10-17-2020, 05:10 PM   #2
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Hmmm, I‘Ve never heard of a dump valve switch on the older models.

Wonder if a previous owner added that.

It’s always possible that debris of some sort lodged itself in your valve, preventing it from closing.

Might take a good look at everything with a flashlight.

Good luck!

Maggie
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Old 10-17-2020, 06:19 PM   #3
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Thanks for the quick reply.

The switch is standard installation. This from the manual on the exterior diagram page (E-4)

4. Electric Dump Valve Switch is located on the shower panel inside the rear cargo doors. Push and hold the switch to open the holding tank dump valve.
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Old 10-17-2020, 06:38 PM   #4
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Interesting.

I had an 06 for 11 years, now an 07 the past two, only manual dump valves.

I still suggest seeing if something is stuck in there.

Maggie
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Old 10-17-2020, 07:43 PM   #5
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Quote:
Originally Posted by Wandr View Post
Thanks for the quick reply.

The switch is standard installation. This from the manual on the exterior diagram page (E-4)

4. Electric Dump Valve Switch is located on the shower panel inside the rear cargo doors. Push and hold the switch to open the holding tank dump valve.
My '04 has that lovely solenoid-actuated dump valve as well. It's a crap shoot (no pun intended) whether it's going to open or close. So far, mine has stuck a couple of times, but exercising it seems to allow the valve to open and close... and then it's fine again for a while. I think exercise is the key.
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Old 10-18-2020, 07:54 AM   #6
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Thanks for the advice.

By exercise the valve, do you mean manually with a screwdriver at the dump valve override?
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Old 10-18-2020, 02:23 PM   #7
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Thanks for the advice.

By exercise the valve, do you mean manually with a screwdriver at the dump valve override?
No, just operate the switch until the solenoid actually moves the valve open and closed.

It takes two or three cycles sometimes to get mine to work after it's sat for a while. Eventually, though it opens and closes again.
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Old 10-18-2020, 03:34 PM   #8
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Quote:
Originally Posted by Lily&Me View Post
Interesting.

I had an 06 for 11 years, now an 07 the past two, only manual dump valves.

I still suggest seeing if something is stuck in there.

Maggie
You and me both, on the implication that we expect it to be manual. This is the first time in 6 years I have heard about any T1N Interstate or Parkway having any mechanized dump. What the freak?! Maybe it was short-lived and Airstream discontinued it because it was problematic.
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Old 10-18-2020, 05:12 PM   #9
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Ok. I will give that a try.

But with it being a crapshoot whether or not the electric valve is operating, I still think I am going to shorten my dump tube a few inches and then keep the valterra manual valve on as a back up.

Thanks for the help.
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Old 10-19-2020, 11:10 AM   #10
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Originally Posted by Wandr View Post
Ok. I will give that a try.

But with it being a crapshoot whether or not the electric valve is operating, I still think I am going to shorten my dump tube a few inches and then keep the valterra manual valve on as a back up.

Thanks for the help.
The Valterra valve is great if the solenoid is stuck open. If the solenoid valve sticks closed, you can't dump your tank. And THAT is a problem. When my solenoid finally decides to fail, I'll just replace the solenoid valve with a manual valve.
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Old 10-19-2020, 01:14 PM   #11
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I had the same issue. The valve is a sliding door that travels back and forth and seals in a groove. What was happening in my case was toilet paper was blocking the sliding door from fully closing. I crawled under the van and disconnected the rod from the actuator, then, gripping the rod, I moved the valve door back and forth (open and closed) in an attempt to chop up the paper that was blocking things. I flushed some water through the valve, hooked it back up to the actuator and all is good. I also changed brand of rv toilet paper, too, in case that was the problem.
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Old 10-19-2020, 06:31 PM   #12
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I believe all the rear-bath T1N AIs had the combined grey/black and an electric valve.

I don’t know if they are really problematic if used regularly- but by now that is pretty old and may have sat dry for quite some time.

If you don’t mind the manual valve (I have a 2006, but mid-bath so has two tanks and two manual valves), then I suggest replacing the electric one with a manual next time empty and you have time.

I seem to recall reading something in the manual about how to activate the electric valve manually? I may be mistaken, since I would have blown over that, having manual ones on mine.
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Old Yesterday, 02:10 PM   #13
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ISSUE RESOLVED -

I cycled the switch today as recommended, and, well it appears that this was a user error issue

But, I will point out that I was following the directions per the owners manual.
Page G-20 says to "Push and hold the switch until the tank is empty. Release the switch to close the valve."

Not an entirely true set of directions there. Yes push and hold in the up position to empty the tank(open the valve). But, releasing the button does not close the valve. One must push and hold the button in the down position to close it.

Live and learn!
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