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7) 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 waste water will keep running down the drain, depleting the pre-filters, the
membrane, and costing high water bills.
See Fig.16. The Auto-Shut-Off (ASO) valve is located at point C. The Check Valve is located
at point E. These two valves control the RO’s shut off function.
If one of these valves fails (valve worn out, clogged, or defective), the system cannot shut off, and
the waste 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), 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 pulling 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
defective. Proceed to Test #2.
6) System Does Not Shut-Off: Waste water runs all day - and Never Stops
- Input pressure way too low (below 30psi). Not enough pressure to shut off the RO at all —>
Check input water pressure. If pressure is below 30psi, need switch to Booster-Pumped RO
model. Contact APEC customer service for assistance.
- One of the shut-off valves is defective, so RO cannot shut off —> Do a shut-off test to
determine which valve is defective. Do test as shown below.
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