RODI auto shutoff valve worn out?

[ianryd]

I just changed all filters and membrane on an Aquatic Life twist in RODI. I have had it hooked up with water always on for several years with an auto shut off valve with no issues. Today I noticed the waste water running when the RODI was not in use. So I took the valve apart and it seemed a little dried out (but not brittle or falling apart) so I put a little Vaseline on everything and reassembled it. It still doesnt shut off. Do these valves have a service life? They seem pretty simple like they would never wear out but I think mine just did.

 

[Reefing Madness]

 

[ianryd]

Ordered a new auto shut off valve, still have the same problem. I suspect the membrane (I used one that had been used lightly a while ago and stored sealed with water in it) is bad so I have another on the way. Fingers crossed

 

[ianryd]

Still no luck with the new membrane. Just to recap, when the RODI is not making water, the waste water is still flowing. My Auto shutoff valve is installed correctly as it has been for years. I'm at a loss as of what to do here. I'm going out of town next weekend and need to get this figured out now!

 

[ianryd]

For anyone following I did come up with a fix. Below is how Aquatic life tells you to route the ASV which is the way It has been hooked up and working perfectly for years.

But for whatever reason it stopped working, so I hooked it up after the carbon block like most other RODI units like in this youtube video and it's working fine now. I guess I'll never know why it stopped working but I'm glad I found a solution.