RO-Pump Troubleshooting

Below are the common problems you might encounter as an APEC RO-Pump Owner. Please identify the problems on your RO-Perm with the help of the diagram. Click on the problems for solutions and literatures. If problems persist, please call your APEC technical support center for further instructions (Toll Free: 1-800-880-4808).

Problem
Visual Reference and Brief Explanation
Generally refer to the RO faucet
Faucet
Water from the black drain line going to the drain saddle
RO water from the faucet
Check Valve. Point E on Figure 1
RO water from the faucet
Pump does not work
Make sure all connections and adaptors are secure
See Figure 1
All connections and Possible missing O-Rings
RO water
Troubleshoot Points Identification:

Point A: Feed water enters the RO's Stage-1 sediment filter at point A.

ESO: From Stage-1 filter water flows to the ESO (Electric Shut Off) valve.

Point P1: Water from ESO valve enters the Pump at P1.

Point P2: Water exits the pump at P2, flows through Stages 2 & 3 carbon prefilters.

Point B: Exits Stage-3 carbon filter (output port) at point B.

Point D: Enters the membrane at point D (membrane cap).

Point W: Waste water from the membrane exits thru point W, drains off via Black drain line.

Point E: Purified water from the RO membrane exits thru point E.

TSO: Flows up and enters the TSO (Tank Shut Off) valve at T1, and exits at T2.

Points F: From TSO, water flows to point F and G, the T-fitting on Stage-5 filter.

Point G: From point G, water flows onto the storage tank.

Point H: When pure water is dispensed, it leaves the tank via the Yellow line, passes thru the Stage-5 filter and exits at point H, then flows onto the RO dispensing faucet.

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