Navien NP-180, Руководство по обслуживанию

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©N
avien
Am
eri
c
a
I
n
c
. 20
1
0
NR/NP
series servi
c
e Manua
l
114
Versi
o
n 2.0
5.23. 39Error
Error occurrence conditions and check items
Description Error
39E
Flow sensor
error
Check items
Yes
Water flow out?
Yes
No
Check connector
Or Replace water flow sensor
Cancelation cascade
system and faucet open
Check supply cold water
1
.
Ch
e
c
k t
h
e su
pply of cold w
ater.
(F
r
oz
en
/ loc
ke
d
va
l
ve
)
2.
D
e
f
e
c
tive
flow
sens
o
r.
3
.
D
e
f
e
c
tive
PCB
.
A
s
o
ne
o
r
mo
re units are
op
eratin
g
in t
h
e
c
as
c
a
d
e s
y
ste
m,
i
f
n
o flow
is
d
ete
c
te
d
wh
i
l
e t
h
e s
y
ste
m op
ens t
h
e
w
ater a
dj
ust
m
ent va
l
ve
,
t
h
e s
y
ste
m co
nsi
d
ers it as a
d
e
f
e
c
tive
flow
sens
o
r.
Th
e s
y
ste
m d
is
pl
a
y
s
39E (cl
eare
d m
anua
lly) o
n t
h
e re
mo
te
co
ntr
oll
er an
d
t
h
e
PCB,
an
d
s
w
it
ch
es int
o
t
h
e
Loc
k
-O
ut
mod
e
(g
as va
l
ve an
d
i
g
niti
o
n
trans
fo
r
m
er
loc
ke
d)
.