Problem with RO unit

xabo · 02/06/2018, 04:48 PM

After changing the membrane on my RO unit, the unit fails to turn off completely, i.e. the gauge registers around 5-10 psi and water continues to exit the unit. Tried reseating the membrane with no luck.

In order to have the unit shut down completely I have to disconnect the line feeding the membrane housing in order for the water stop.

outy · 02/06/2018, 05:20 PM

Quote:

Originally Posted by xabo

In order to have the unit shut down completely I have to disconnect the line feeding the membrane housing in order for the water stop.

That is how it is supposed to be plumbed. My on/off water solenoid sits in front of my membrane.

Unless you have the in/out inline pressure shut off valve, in that case the valve is sticking for who knows what reason. They are easy enough to pull apart and clean /check/inspect

tkeracer619 · 02/07/2018, 02:04 AM

Sounds like a faulty ASOV if you have one.

mcgyvr · 02/07/2018, 05:58 AM

Just so its clear.. Do you mean that when you close the valve on the good water output line that the water continues to flow out the waste water line?

xabo · 02/07/2018, 08:35 AM

Quote:

Originally Posted by mcgyvr

Just so its clear.. Do you mean that when you close the valve on the good water output line that the water continues to flow out the waste water line?

Unit is connected to an Avast ATO. Normally once the ATO container is full, the electronic solenoid trips shutting off the pump and water supply. Since changing the membrane, everything shuts down however water continues to flow out of the GOOD water line.

mcgyvr · 02/07/2018, 09:35 AM

Quote:

Originally Posted by xabo

Unit is connected to an Avast ATO. Normally once the ATO container is full, the electronic solenoid trips shutting off the pump and water supply. Since changing the membrane, everything shuts down however water continues to flow out of the GOOD water line.

Sounds like the solenoid is not closing then and needs to be replaced..

outy · 02/07/2018, 06:40 PM

Quote:

Originally Posted by mcgyvr

Sounds like the solenoid is not closing then and needs to be replaced..

Exactly, hopefully he has a filter before it, they will get debris and stay stuck open just like that if not there.

xabo · 02/07/2018, 08:23 PM

Quote:

Originally Posted by mcgyvr

Sounds like the solenoid is not closing then and needs to be replaced..

Checked and you are right...............Thanks for your help!!!

xabo · 02/09/2018, 10:02 AM

I disconnected the line coming from the solenoid to the RO unit, unplugged the solenoid and there was no water coming from the solenoid but there was water coming from RO unit as if there is some type of back pressure building up in the unit.

02/06/2018, 04:48 PM	#1
xabo Registered Member Join Date: Oct 2002 Location: Wash. D.C. Posts: 637	Problem with RO unit After changing the membrane on my RO unit, the unit fails to turn off completely, i.e. the gauge registers around 5-10 psi and water continues to exit the unit. Tried reseating the membrane with no luck. In order to have the unit shut down completely I have to disconnect the line feeding the membrane housing in order for the water stop.

02/07/2018, 02:04 AM	#3
tkeracer619 Registered Member Join Date: Jan 2006 Location: Westminster, CO Posts: 17,289	Sounds like a faulty ASOV if you have one. __________________ Hobby Experience: 9200ish gallons, 26 skimmers, and a handful of Kent Scrapers. Current Tank: Vortech Powered 600G SPS Tank w/ 100gal frag tank & 100g Sump. RK2-RK10 Skimmer. ReefAngel. Radium 20k.

02/07/2018, 05:58 AM	#4
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	Just so its clear.. Do you mean that when you close the valve on the good water output line that the water continues to flow out the waste water line? __________________ Who me?

02/09/2018, 10:02 AM	#9
xabo Registered Member Join Date: Oct 2002 Location: Wash. D.C. Posts: 637	I disconnected the line coming from the solenoid to the RO unit, unplugged the solenoid and there was no water coming from the solenoid but there was water coming from RO unit as if there is some type of back pressure building up in the unit.