Navien NP-180, Service Manual

Page: 81 / 179

©N
avien
Am
eri
c
a
I
n
c
. 20
1
0
NR/NP
series servi
c
e Manua
l
79
Versi
o
n 2.0
5.6. 08Error
Error occurrence conditions and check items.
Description Error
08E
Short-circuit
of hot water
temperature
sensor
Check items
Ch
e
c
k t
h
e
ho
t
w
ater te
mp
erature sens
o
r.
If
a
p
r
obl
e
m (
s
ho
rt
-c
ir
c
uit
:
2
48 ȕ o
r
h
i
gh
er
)
is
d
ete
c
te
d fo
r
3
se
co
n
d
s
,
t
h
e s
y
ste
m d
is
pl
a
y
s t
h
e err
o
r
m
essa
g
e 0
8E o
n t
h
e re
mo
te
co
ntr
oll
er an
d
t
h
e
PCB
.
(Hot w a t er o u tp u t t e mp era t ure s en so r )
1
.
Ch
e
c
k i
f
t
h
e
ho
t
w
ater te
mp
erature sens
o
r
co
nne
c
t
o
r is
w
et
d
ue t
o
an
y
reas
o
n
,
in
cl
u
d
in
g l
eaka
g
e.
2.
R
e
pl
a
c
e t
h
e
d
e
f
e
c
tive
ho
t
w
ater te
mp
erature sens
o
r.
3
.
R
e
pl
a
c
e t
h
e
PCB
.
Is the hot water thermistor
normal?
Yes
No
Check connector
Replace hot water thermistor
Resistance between two red wires of CN 13 is from
0.8 to 20k ohm at normal condition.
Caution: B efore measuring resistance of the
thermistor, remove the connector from the PCB