RO unit issue

[chimbo84]

My RODI unit recently started doing this thing where it will repeatedly turn on for a second and the pressure indicator bounces and then stops for another second or two. Here is a video.



Any ideas what could cause this? Is it a bad auto shutoff valve? The unit is hooked up to a 3gal RO tank to supply our fridge and ice maker but t

 

[Chrisv.]

Not sure. Bumping this. Is is still making water while this happens? Could it be as simple as a bad gauge?

 

[redfishbluefish]

I can only guess....thinking the bladder in the 3 gallon storage tank is the problem. Let's see if Russ @Buckeye Hydro has an idea?

 

[chimbo84]

Not sure. Bumping this. Is is still making water while this happens? Could it be as simple as a bad gauge?

Yes, it is still making refuse water but the valves are closed on the product side when this occurs. I also isolated the drinking water tank from the system and it continues to do it. The only way to stop this it seems is to turn off the supply. I’m really thinking that it’s the auto shutoff valve.

 

[LeftyReefer]

Is there a tank shut off valve and booster pump on this system?

 

[chimbo84]

Is there a tank shut off valve and booster pump on this system?

No booster pump but there is a tank shutoff which I have tried closing to isolate the tank. That does not resolve the issue.

 

[The Farmer]

It seems like your auto shut off is going bad and not stopping the waste water completely when your tanks are full

 

[Buckeye Hydro Verified Sponsor]

You probably have a bad check valve. Somewhere between the permeate port on the RO membrane housing and the ASOV, you have a check valve.
https://www.buckeyehydro.com/check-valves/

 

[chimbo84]

You probably have a bad check valve. Somewhere between the permeate port on the RO membrane housing and the ASOV, you have a check valve.
https://www.buckeyehydro.com/check-valves/

Thank you. Looks like I have some swaptronics to play with the check valve and ASOV.

 

[chimbo84]

You probably have a bad check valve. Somewhere between the permeate port on the RO membrane housing and the ASOV, you have a check valve.
https://www.buckeyehydro.com/check-valves/

I have to thank you because this advice was right on point. I swapped out the 90degree check valve on the permeate port and it fixed the issue. Thanks!

 

[Buckeye Hydro Verified Sponsor]

When an ASOV stops working, it is caused by one or more of three things:

• Float valve on the system outlet is leaking
• Check valve is bad
• ASOV itself is bad.

Russ