Instructions / Assembly
33
If the noise comes back, try the above procedure again another 2-3 times. Sometimes it takes several
tries to get rid of all the air in the system.
If the noise persists after a few days, that means there is air in your water source, or the current Check
Valve is resonating with your water pressure and pipes, creating the noise.
In this case, a new Check Valve will solve the problem. Contact APEC customer service for assistance.
* * * End Trouble-Shoot Guide * * *
Close
Tank
Valve
Fig. 18
Step 1 Step 2 Step 3
12) RO Makes Humming Noise
When RO makes a humming noise, most likely it’s caused by air bubbles being trapped in the “Check
Valve” during installation. See check valve on Fig. 17, point E (Page 27).
To purge air from the check valve, do as follows:
Step 1: Close the tank’s valve.
Step 2: Tilt the RO system to the right. Put something under the 3rd filter housing to keep RO tilted. This
helps dislodge the air bubbles from the Check Valve.
Step 3: Turn on the RO spigot. Let pure water flow throuh the spigot for about 1 minute. This forces the
air to flow directly out to the spigot, bypassing the tank.
Step 4: Turn off the spigot. Wait for about 10 seconds. Repeat Step 3 again. Do that 3-4 times. If you
see air sputtering out of the spigot, repeat Step-3 until pure water can flow smoothly from the spigot, or
until the noise goes away.
Step 5: When the noise is gone, open the tank valve, let RO run as usual.
Tilt
System
Check
Valve
33
If
the noise comes back, t
ry
t
he
he
a
a
bo
bo
ve
p
rocedure a
ga
in another
2
-3
3
t
im
m
es
es
.
S
So
metimes it takes several
tries to get rid o
f
all the air
in
t
t
he
he
syste
m.
If
the noise persists
af
f
tete
r r
aa
fe
fe
w days, that means there is air in your water source, or the current Check
Valve is resonating wi
th
h
y
y
o
ou
r water pressure and pipes, creating the noise.
I
n this case, a new Check Valve will solve the problem. Contact APEC customer service
f
or
as
as
si
si
stst
a
an
ce.
* *
*
E
E
nd
nd
T
T
ro
ub
l
e
-S
h
o
ot
G
ui
de
*
*
*
ClCl
o
os
e
TaTa
a
a
n
k
V
Va
a
lv
e
F
i
g. 18
S
tep
1
S
tep
2
S
St
ep 3
12) RO M
ak
ak
es
es
H
H
umming Noi
se
g
Wh
Wh
en
n
R
R
O makes a hummin
g
noise, most li
ke
ke
lyly
i
t’s caused b
y
air bubbles bein
g
g
tr
ap
pe
pe
d
d
in the “Check
Va
Va
lv
v
e”
e
during installation. See check valv
e
on
on
F
Fi
g. 17, point E
(
Page 27
)
.
T
To
purge air
f
rom the check valv
e,
dd
oo
as
as
f
f
ollows
:
St
ep
1: Close the tank’s valve.
Step 2: Tilt the RO system to the right. Put something under the 3rd
f
ilter housing to keep RO tilted. T
hi
hi
ss
helps dislodge the air bubbles
f
rom the Check Valv
e.
St
ep
3: Turn
o
o
n n
thth
e e
RO s
pi
go
t. Let
p
ure water
f
low t
hr
hr
ou
ou
h h
th
th
e
sp
ig
ot
f
or about 1 minute. This
fo
o
rcrc
e
es
t
t
he
air to
f
low
di
di
rere
ctct
ly
ly
out to the spigot, bypassing the
ta
ta
nknk
.
Step
4
4
:
:
Tu
Tu
rn
rn
o
ff
the spigot. Wait
f
or about
10
0
s
s
ec
ec
o
on
ds. Repeat Step 3 again. Do th
at
t
33
-4
-4
t
t
im
im
es. I
f
you
s
ee
ai
ai
r
r
sp
sp
uttering out o
f
the spigot, repe
at
at
S
te
p-
p
3 until pure water can
f
low smoo
th
h
ly
ly
f
f
ro
ro
m the spigot, o
r
un
u
ti
ti
l
l
t
th
e noise
go
es awa
y.
S
St
ep 5: When the noise is gone,
op
op
en
en
the tank valve, let RO run as usual.
T
i
lt
Sy
st
t
emem
C
h
ec
k
V
a
lve