Time for a new flow restrictor?

[testhead1313]

Okay, so my RO/DI unit doesn't shut off when the pressurized tank is full unless I open the flush valve and close it again. It seems like the intuitive thing would be that the flush valve is faulty, but it's a ball valve, right? How would that go bad - also, it doesn't leak after I open it and close it again (brief flush)? A more reasonable explanation is that the flow restrictor is bad, but how would this cause the problem? To summarize, I will fill some jugs and cause the pressure in the tank to decrease. Water flows into the RO unit and begins to refill the tank, with waste water going down the drain. If the pressure in the tank drops low enough, my booster pump kicks in via a pressure switch and increases the pressure on the RO membrane. The pump continues to run until the pressure switch on the tank shuts it off. The tank is now full, but water is still flowing down the drain (slower than when filling, but still a significant amount). The only way to stop the water from flowing down the drain is to play with the flush valve. Once I open and close the valve, everything holds up just fine until I fill jugs again. It may be the extreme lack of sleep or my lack of knowledge about an RO unit, but WTH is causing this? Thanks for any help!
Chris

 

[MikeG]

Sure it is not a problem with the solonoid that shuts off the source water when the container is full? Could it be that you playing with the flush valve is changing the pressure in the system and getting the solonoid to close?

The waste water line should have nothing to do with the function of the pressure solonoid that I am aware of unless it is hooked up incorrectly. I actually noticed that mine was doing this recently and it was the solonoid, but mine wouldn't stop producing waste water at all!

 

[testhead1313]

So did you have to replace the solenoid Mike? And it solved your problem? If so, where did you buy it from? Thanks!
Chris