Troubleshooting
Guide
15|
Page
ERROR
CODE
311
[510
(T
‐
D2)],
TWO
FLASHES/31
[110
(T
‐
KJR2),
310
(T
‐
K4)]
OUTPUT
THERMISTOR
1)
Check
that
the
wire
connections
are
secure
and
free
of
burns
or
cuts.
The
output
thermistor
is
located
on
the
heat
exchanger
on
the
right
side.
2)
Check
the
resistance
value;
it
should
be
about
9.0k
Ω
at
room
temperature
(about
74°F).
3)
Clean
the
thermistor.
a.
Drain
the
unit
of
water.
See
p.
21.
b.
Remove
the
fastener
holding
the
output
thermistor
and
pull
out
the
sensor
probe.
Clean
the
probe
to
a
silver
finish.
Do
not
lose
the
rubber
o
‐
ring
that
wraps
around
this
sensor.
c.
Replace
and
test.
4)
If
the
error
code
persists,
replace
the
thermistor.
ERROR
CODE
321
[510
(T
‐
D2)],
TWO
FLASHES/32
[110
(T
‐
KJR2),
310
(T
‐
K4)]
INLET
THERMISTOR
1)
Check
that
the
wire
connections
are
secure
and
free
of
burns
or
cuts.
The
inlet
thermistor
is
embedded
in
the
water
inlet
connection.
2)
Check
the
resistance
value;
it
should
be
about
9.0k
Ω
at
room
temperature
(about
74°F).
3)
Clean
the
thermistor.
a.
Drain
the
unit
of
water.
See
p.
21.
b.
Remove
the
computer
board
to
access
the
inlet
thermistor.
The
computer
is
fixed
in
place
by
a
single
screw
at
the
top
of
the
board.
c.
Remove
the
screw,
pull
out
the
sensor
probe.
Clean
the
probe
to
a
silver
finish.
Do
not
lose
the
rubber
o
‐
ring
that
wraps
around
this
sensor.
d.
Replace
and
test.
4)
If
the
error
code
persists,
replace
the
thermistor.
ERROR
CODE
331
[510
(T
‐
D2)]
MIXING
THERMISTOR
1)
Check
that
the
wire
connections
are
secure
and
free
of
burns
or
cuts.
The
mixing
thermistor
is
embedded
in
the
water
outlet
connection.
2)
Check
the
resistance
value;
it
should
be
about
9.0k
Ω
at
room
temperature
(about
74°F).
3)
Clean
the
thermistor.
a.
Drain
the
unit
of
water.
See
p.
21.
b.
Remove
the
computer
board
to
access
the
mixing
thermistor.
The
computer
is
fixed
in
place
by
a
single
screw
at
the
top
of
the
board.
c.
Remove
the
screw,
pull
out
the
sensor
probe.
Clean
the
probe
to
a
silver
finish.
Do
not
lose
the
red
rubber
o
‐
ring
that
wraps
around
this
sensor.
d.
Replace
and
test.
4)
If
the
error
code
persists,
replace
the
thermistor.
Figure
8
Figure
9
