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Troubleshooting
35
│
Page
‐
FAULT
ANALYSIS
OF
ERROR
CODES
‐
Red
LED
Remote
Malfunction
description
Diagnosis
One
Time
03
Incorrect
dipswitch
setting
Check
the
dipswitch
settings
on
the
PCB.
(Part
#701)
Five
Times
10
Warning
for
the
“991”
error
code
Check
the
gas
type
of
the
water
heater.
Check
if
there
is
any
blockage
in
the
intake
air
and/or
exhaust.
If
the
water
heater
is
installed
as
a
direct
‐
vent
system,
check
whether
there
is
enough
distance
between
the
intake
air
terminal
and
the
exhaust
terminal.
Check
the
altitude/elevation
of
area
of
where
the
water
heater
installed.
Check
if
there
is
grease
and/or
dirt
in
the
burner
(Part
#101)
and
the
fan
motor
(Part
#103),
especially
if
the
water
heater
has
been
installed
in
a
contaminated
area.
Three
Times
11
Ignition
failure
Check
if
the
Hi
‐
limit
switch
(Part
#412)
is
properly
functioning.
Check
for
connection/breakage
of
wires
(Part
#413,
708,
709,
710,
712),
burn
marks
on
the
computer
board
(Part
#701),
and/or
soot
on
the
flame
rod
(Part
#108).
Check
if
there
is
a
buzzing
spark
ignition
sound
coming
from
the
burner
(Part
#101)
when
water
heater
prepares
for
combustion.
Listen
for
the
double
“clunk”
sound
coming
from
gas
valve
assembly
(Part
#102)
when
water
heater
goes
into
combustion.
Check
if
there
is
leaking
from
heat
exchanger.
(Part
#401)
Three
Times
12
Loss
of
flame
Check
if
the
Hi
‐
limit
switch
(Part
#412)
is
properly
functioning.
Check
for
connection/breakage
of
wires
(Part
#413,
708,
709,
710,
712),
burn
marks
on
the
computer
board
(Part
#701),
and/or
soot
on
the
flame
rod
(Part
#108).
Check
if
there
is
leaking
from
heat
exchanger.
(Part
#401)
Two
Times
31
Outlet
thermistor
failure
Check
for
connection/breakage
of
wires
and/or
debris
on
thermistor.
(Part
#407,
408)
32
Inlet
thermistor
failure
Two
Times
39
Air
–fuel
Ratio
Rod
failure
Check
for
connection/breakage
of
wires
(Part
#709)
and/or
soot
on
the
AFR
rod.
(Part
#108)
If
the
error
code
displayed
on
the
computer
board
of
the
Water
heater
or
remote
controller,
please
check
the
following.
After
checking,
Consult
with
the
manufacturer
.