Installation Guide

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10) How to Test RO’s Shut-Off Function:
The RO system should shut off automatically when the tank is filled. When the RO fails to shut off after
tank is filled, the drain water will keep running down the drain, depleting the pre-filters and membrane.
See Fig. 17 Page 28. The Auto-Shut-Off (ASO) valve is located at point C. The Check Valve is locat-
ed at point E. These two valves control the RO’s shut off function.
If one of these valves is not working correctly, the system cannot shut off and drain water may run non-
stop, the system cannot shut off, and the drain water fill keep running non-stop.
Do test #1 and #2 below to determine if the RO can shut off, and if the valves are OK.
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), turn off water to these lines using
a manual shut off valve.
- Wait for 3- 5 minutes, then check to see if the drain water stops running.
- Check drain water by either “listening” or actually taking out the drain line to look at it.
- If drain water stops running --> The RO is shutting off properly. Both the ASO valve and the Check
Valve are working fine. Stop testing.
- If Drain water continues to run --> Then either the Check Valve and/or the ASO valve is not working
correctly. Proceed to Test #2.