Troubleshooting Guide - A.O. Smith AO-US-RO-4000 Owner's Manual

PROBLEM POSSIBLE CAUSE
O-ring not sealed
due to sump cap
undertightening
Leaking
1
from
Sumps
overtightened
creating a pinch
in the O-Ring
Leaking
2
from
Key Hole
Obstruction in
the drain line
Flow restrictor not
installed, water
continuosly leaking
Constant
down the drain line
Noise /
3
Loud
Noise
Tubing causing
vibrations against
This is a 4-stage Reverse Osmosis system. This system is not powered and uses the regular flow of
water pressure to force water through the filtration process. If you feel that the flow of water from
your dedicated faucet is abnormally slow, follow the steps below to troubleshoot.
Low Water Pressure
Sumps not fully
engaged in
4
Slow
Flow
Tank pressure is
not between
Turn off water supply. Remove leaking sump from system manifold.
Using provided sump wrench, gently turn the sump cap clockwise until
it stops to position O-ring in optimal seal position. Be careful not to
manifold. Using provided sump wrench, gently turn the sump cap
Sumps
counterclockwise to disconnect sump cap. Check O-ring for damage in
the form of cuts or abrasions. Check threads on sump for damage. If
either part is damaged, contact customer service. If there is no damage,
using provided sump wrench, gently turn the sump cap clockwise until it
stops to position O-ring in optimal seal position. Do not overtighten.
Refer to tubing diagram on Pg. 8. Check red tube marked "6"
Drain line for kinks that could constrict water flow. Also check for loops.
is kinked This line is not pressurized. Water needs a straight path for gravity
Look into the red tube marked "6" to see if there are any obstructions
If unable to clean the line, cut the tubing to the obstruction, remove
the obstruction, and reconnect the tubing. STOP: Before cutting tubing,
Refer to flow restrictor diagram on Pg. 8. Turn off water supply.
Remove the 90 degree elbow from the RO Membrane and check for the
small insert within tubing marked "5". If insert is missing, place flow
restrictor into tubing and reconnect tubing and elbow to RO membrane.
Check to see if any tubing is in direct contact with anything under the
sink. Tubing can move while the water is running through the system
objects causing vibrations. Turn off water supply and move tubing if necessary.
Using a water pressure gauge (not provided), test incoming water pressure
to ensure pressure is at least 40 psi. Best performance is at 60 psi.
manifold
Refer to diagram on Pg. 5. Turn off water supply. Drain RO tank
completely by opening the dedicated faucet and releasing water until
it stops. Disconnect the tank connector from the tank and turn it upside
Using a digital pressure gauge (not provided), check the tank pressure
5-7 psi
to ensure it is between 5-7 psi. If the pressure is too low, use a bike
pump to add pressure in the small nozzle at the bottom of the tank.
If pressure is too high, you can press down the pin to release

TROUBLESHOOTING GUIDE

SOLUTION
overtighten as this can also cause leaking.
Turn off water supply. Remove leaking sump from system
to force water down the drain.
Refer to tubing diagram on Pg. 8. Turn off water supply.
clogging the line. Using a pipe cleaner or thin bottle brush,
try to remove the obstruction.
make sure there is enough tubing to reconnect lines.
Refer to diagram on Pg. 9. Turn off water supply.
Turn sump all the way to the right until it stops.
down to ensure all water has been removed.
pressure until optimal psi is achieved.
NEED HELP? GIVE US A CALL 877.333.7108
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