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Test#2: Test Check Valve and ASO valve:
- Make sure there is some water in the tank (tank not empty).
- Remove the Black drain line from the drain saddle (so you can check waste flow drainage).
- Turn OFF the Cold feed water supply.
- Turn ON the tank valve.
- Check the Black drain line to see if there is any water draining out from this line.
- If water does drain out from the black line --> Then this water is coming from the storage tank.
This means the Check Valve is broken, it is allowing the water in the tank to back flow out into the
drain line.
Solution: Replace Check Valve ( see Fig.16 point E )
- If no water drains out from the black line (no waste water running) --> That means the Check
Valve is OK. The RO’s non-shut off is caused by a defective ASO valve, not caused
by the Check Valve.
Solution: Replace ASO valve ( located at Fig.16 point C )
Test#1: Can the RO system shut off?
- Draw 2-3 glasses of water from spigot. RO will start making water to fill tank.
- Turn OFF the tank’s valve to mimic “tank full”.
- If your RO feeds multiple output points (icemaker, bathroom, etc), shut OFF those lines.
- Wait for 3- 5 minutes, then check to see if the waste water stops running.
- Check waste water by either “listening” or actually taking out the drain line to look at it.
- If waste water stops running --> The RO is shutting off properly. Both the ASO valve and the
Check Valve are working fine. Stop testing.
- If waste water continues to run --> Then either the Check Valve and/or the ASO valve is defec-
tive. Proceed to Test #2.
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