Navien NP-180, Руководство по обслуживанию

Страница: 100 / 179

©N
avien
Am
eri
c
a
I
n
c
. 20
1
0
NR/NP
series servi
c
e Manua
l
98
Versi
o
n 2.0
5.14. 27Error
Error occurrence conditions and check items.
Description Error
27E
Air volume
sensor error
Check items
Ch
e
c
k t
h
e asse
mbly of
t
h
e
co
nne
c
t
o
r
of
t
h
e air v
ol
u
m
e sens
o
r.
Ch
e
c
k t
h
e v
ol
ta
g
e
of
t
h
e air v
ol
u
m
e sens
o
r.
During fan motor stop, is the
output voltage of APS normal?
Yes
No
Replace APS Check Connector
During fan motor operation,
is the output voltage of APS
normal?
Yes
No Replace APS
Check the voltage between black and white wire of
CN 6: 1 - 4VDC
Check the voltage between black and white wire of
CN 6: 0.2 - 0.6VDC
Replace PCB
If
an err
o
r
(op
en
:
0.
1±
0.
1
V
o
r
low
er
/
s
ho
rt
-c
ir
c
uit
: 4
.
5±
0.2 V
o
r
h
i
gh
er
)
in t
h
e air
v
ol
u
m
e sens
o
r is
d
ete
c
te
d co
ntinu
o
us
ly fo
r
3
se
co
n
d
s
, o
r i
f
t
h
e air v
ol
u
m
e sens
o
r
v
ol
ta
g
e
of 1
.20 V is
d
ete
c
te
d b
e
fo
re
p
re
-p
ur
g
e
,
t
h
e s
y
ste
m d
is
pl
a
y
s t
h
e err
o
r
m
essa
g
e 2
7E o
n t
h
e r
oom co
ntr
oll
er an
d
t
h
e
PCB
.