Navien NP-180, Service Manual

Page: 101 / 179

©N
avien
Am
eri
c
a
I
n
c
. 20
1
0
NR/NP
series servi
c
e Manua
l
99
Versi
o
n 2.0
Check method
Check method Cause Error type
D
e
f
e
c
tive
sens
o
r
O
t
h
er tr
o
u
bl
e
Co
nne
c
t
o
r
co
nta
c
t err
o
r
D
e
f
e
c
tive air
v
ol
u
m
e sens
o
r
D
e
f
e
c
tive
PCB
Ch
e
c
k
co
nne
c
t
o
r asse
mbly
an
d co
nta
c
t
of
t
h
e air v
ol
u
m
e sens
o
r.
1
.
Ch
e
c
k t
h
e air v
ol
u
m
e sens
o
r va
l
ue
d
is
pl
a
y
e
d o
n t
h
e
PCB
.
(AD
va
l
ue
) (A
.
15
0
ȥ 15
0
)
Ch
e
c
k t
h
e va
l
ue at
m
in
/ m
a
x of
t
h
e
comb
usti
o
n s
p
e
c
i
fic
ati
o
n ta
bl
e.
R
e
pl
a
c
e t
h
e air
p
ressure sens
o
r i
f
an err
o
r
occ
urs
(
stan
d
ar
d
va
l
ue
±5
00
o
r
h
i
gh
er
)
.
2.
Ch
e
c
k t
h
e air v
ol
u
m
e sens
o
r v
ol
ta
g
e.
Op
eratin
g
v
ol
ta
g
e
(Bl
a
c
k
+R
e
d) : DC 5
V
Sens
o
r
o
ut
p
ut v
ol
ta
g
e
(Bl
a
c
k
+
W
h
ite
) Op
en
: DC
0.
1±
0.
1
V
o
r
low
er
S
ho
rt
c
ir
c
uit
: DC 4
.
5±
0.2 V
o
r
h
i
gh
er
A
n err
o
r
occ
urs i
f
t
h
e air v
ol
u
m
e sens
o
r v
ol
ta
g
e
of 1
.20V is
d
ete
c
te
d b
e
fo
re
p
re
-p
ur
g
e.
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
.