RODI system holding pressure when off.

JOKER · Oct 29, 2019

So the last time I ran some water up my system is still holding pressure. Help with the issue please. I am leaning towards membranes, is this the issue?

Huff747 · Oct 29, 2019

Are you using a float switch? If so, the back pressure from the float switch closing is what triggers the auto shut off valve and the system will continue to measure pressure. If you're not using a float switch and you turned off the water then I don't know.

W1ngz · Oct 29, 2019

Like Huff said, If you turn off the water at the output (manual valve, float valve or anything of the sort), the pressure on the input is what keeps the auto-shut off closed and stops water flowing. If you want the whole system to be cut off, you need a shut off on the input line or to close the valve on the tap your input line is connected to.

JOKER · Oct 30, 2019

I am using float switches, and I also have a shutoff on the feed line to the unit. The float switches are both open, and the supply line is cut off as well. Been using this setup for 3 years, and the first time I have had this issue.

Daniel92481 · Oct 30, 2019

Try to lift the float valve manually to release the back pressure from the system. It worked for me.

JOKER · Oct 30, 2019

I actually have lifted both of them with no resolve.

LiveWire · Oct 30, 2019

Could be a stuck check valve or someting is clogged up like the flow restrictor.
Will it make water when you turn it on and does the pressure change at all when its running?
I would also try to disconnect all the tubes from the water feed, float switch, etc. and see if that relieves it.

W1ngz · Oct 30, 2019

hrmm, if the supply is cut off and the float (switch and solenoid or float valve?) leaves the output open it can't have pressure. If the membrane was holding back 30psi, I don't think it would pass any water at all.

Try manually cutting off the water input and remove the gauge and see if there is actually any pressure in that line and see if the gauge drops to 0.

JOKER · Oct 30, 2019

LiveWire said:
Could be a stuck check valve or someting is clogged up like the flow restrictor.
Will it make water when you turn it on and does the pressure change at all when its running?
I would also try to disconnect all the tubes from the water feed, float switch, etc. and see if that relieves it.

The unit goes up to 80PSI like usual when I turn it on, and makes water at the same rate or close anyway.

JOKER · Oct 30, 2019

W1ngz said:
hrmm, if the supply is cut off and the float (switch and solenoid or float valve?) leaves the output open it can't have pressure. If the membrane was holding back 30psi, I don't think it would pass any water at all.

Try manually cutting off the water input and remove the gauge and see if there is actually any pressure in that line and see if the gauge drops to 0.

That or removing filters will be my next step. I was just hoping someone could pin point the issue. We will see what it is when I get time to check it out.

lapin · Oct 30, 2019

If you take the gauge off does it "0" out?

JOKER · Oct 30, 2019

lapin said:
If you take the gauge off does it "0" out?

Im not sure right now, but i bet it will since it still shows the same pressure when running. I will try to check it tomorrow if I get time.

MTBake · Oct 30, 2019

Sounds like the shut off valve isn't shutting off water supply. Or you have a bad check valve somewhere. If the gauge doesn't zero out with the supply physically shut off, it could be the gauge.

JOKER · Oct 31, 2019

MTBake said:
Sounds like the shut off valve isn't shutting off water supply. Or you have a bad check valve somewhere. If the gauge doesn't zero out with the supply physically shut off, it could be the gauge.

The issue seems to be the shut off valve. When I unplugged the line going into the shutoff valve the pressure went to 0. I guess I will order a new one, and see if the issue goes away. I will also try and clean out the old one. The unit is working alright right now. I am running up some water because I am low. Thanks for the responses.

MTBake · Oct 31, 2019

JOKER said:
The issue seems to be the shut off valve. When I unplugged the line going into the shutoff valve the pressure went to 0. I guess I will order a new one, and see if the issue goes away. I will also try and clean out the old one. The unit is working alright right now. I am running up some water because I am low. Thanks for the responses.

I like keep a spare auto shut off valve on hand. Just in case something like this happens.