Navien NP-180, Service Manual

Page: 99 / 179

©N
avien
Am
eri
c
a
I
n
c
. 20
1
0
NR/NP
series servi
c
e Manua
l
97
Versi
o
n 2.0
Check method Error
D
e
f
e
c
tive
sens
o
r
O
t
h
er tr
o
u
bl
e
D
e
f
e
c
tive
te
mp
erature sens
o
r
co
nne
c
t
o
r
T
e
mp
erature
sens
o
r
D
e
f
e
c
tive
PCB
<
Heat e
xch
an
g
er in
p
ut te
mp
erature sens
o
r
/
co
nne
c
t
o
r
, Bl
a
c
k 2
P >
< Ch
e
c
k i
f
t
h
e
ho
t
w
ater te
m-p
erature sens
o
r is
op
en
>
Ch
e
c
k i
f
t
h
e te
mp
erature sens
o
r
co
nne
c
t
o
r
o
r t
h
e
PCB h
arness
ter
m
ina
l
is
w
et
d
ue t
o
an
y
reas
o
n
,
in
cl
u
d
in
g l
eaka
g
e.
Ch
e
c
k t
h
e resistan
c
e
of
t
h
e te
mp
erature sens
o
r.
R
e
pl
a
c
e t
h
e te
mp
erature sens
o
r i
f
t
h
e resistan
c
e va
l
ue is a
b
n
o
r
m
a
l
.
(D
e
f
e
c
tive i
f
it is 0.
5
๐
o
r
low
er
)
Ch
e
c
k t
h
e te
mp
erature
d
is
pl
a
y
e
d o
n t
h
e
PCB(C
.
1
0.0
ȥ 1
0.0
ȕ )
.
If
t
h
e tr
o
u
bl
e
co
ntinues
d
es
p
ite t
h
e
ch
e
c
kin
g of
a
bo
ve ite
m
s
,
re
pl
a
c
e t
h
e
PCB
.
Cause
Check method