Installation and Service Manual
– Under-the-Counter Point of Use 5 Stage Reverse Osmosis System
Copyright © 2022 Applied Membranes, Inc.
All Rights Reserved.
Page 18
Troubleshooting Chart
Symptom
Possible Cause
Remedy
No water in the storage
tank
Filter Cartridges have
clogged.
Replace filter cartridges as indicated in
maintenance section.
System Feed Valve and/or
Tank Valve Closed
Ensure the cold water supply, feed valve, and
tank valve are in the fully open position.
No pressure in storage tank. Check pressure with pressure gauge. Refill or
reduce pressure to max 8 psi. Note: Tank must
be empty of water when checking the air
pressure.
Automatic shut-off valve
malfunctioning.
Check lines to valve for correct hook-up and
check water running into the drain. Replace if
necessary.
Kinked lines.
Straighten lines if necessary.
Getting low flow
Incoming water pressure too
low.
Check source of feedwater (city water, well
water, etc.) for pressure. A booster pump may
be required.
Change in feedwater
temperature.
The reverse osmosis membrane used in your
unit is rated at 77ºF and 60psi. Water
production will decrease approximately 1.5%
for each degree that your incoming water is
below 77ºF. It may be necessary to change to
a higher flow membrane (and flow restrictor).
Storage tank pressure is too
low.
Check pressure with gauge and refill to
maximum 8 psi. Note: Tank must be empty of
water when checking the air pressure.
Filters are clogged.
Replace Filters.
Water Leaking from Fittings Tubing not properly seated
Remove tubing. Check that the tubing cut is
completely straight and re-seat tubing. (Page 8)
Water leakage at filter
bowls
Filter bowls are loose.
Retighten.
Burr on edge of filter bowl.
Remove burr with emery cloth or sand paper.
O-Ring in filter bowls is
missing, damaged, or not
sealed properly
Replace or position correctly.
Water backing up to air gap
in faucet (Systems w/ air
gap faucets only)
Line is clogged.
Clean out the line.
Line is too long.
Must be as short and straight as possible.
Drain line is clogged.
Disconnect 3/8” dia. Line and clean out with
probe or by flushing.
Faucet spout is dripping
Handle sticking or worn.
Replace the faucet
Milky colored water
Air in the system
Air in the system is normal after startup of the
RO. Water should lose the milky look within a
few days of normal usage.