136
Ca
use
Che
ck co
de
na
m
e
Che
ck cod
e
Ou
td
oor te
mp se
nsor miswir
ing
(TE, T
L)
1
. Mi
si
ns
tall
ati
on an
d mi
sc
onn
ec
tion
of T
E
sen
sor
and
T
L s
ens
or
2
. Resistance characteristics failure of TE sensor and TL sensor
3
. Outdoo
r
P.C. b
oard (I/F
) trouble
Cause
Check cod
e
na
me
Ch
eck co
de
Outdoor
p
ressure
sensor
mis
w
iring (PD
, PS)
1. High-pressure PD sensor and low pressure sensor
PS are exchanged
2. Output voltage of each sensor is zero
Are co
nn
ec
tio
n
o
f
PD sensor and Ps
se
ns
or
co
nn
e
ct
or
s
co
rre
ct
?
No
Ye
s
Are
ou
tp
ut
vol
tag
e c
ha
rac
te
ri
st
ic
s
of PD sensor and PS
se
ns
or
no
rm
a
l?
No
Ye
s
Are PD / PS
ou
tp
u
t v
al
u
es
PD>PS during
co
mp
re
ss
or
o
p
er
a
tio
n?
No
Yes
Che
ck
outd
oor I/F P
.C. boa
rd
.
Failure
Repl
ace
Ch
ec
k c
o
m
pre
ss
or
Sens
or failure
Rep
lac
e
Cor
re
ct c
onn
ec
tion
of c
onne
cto
rs
.
PD sensor: CN501, Red
PS sensor: CN500, White
(1
) Pr
es
su
re
(
C
hec
k j
oi
nt)
by
pr
ess
ur
e g
auge
(2
) Pr
es
su
re
di
spl
ay
on 7
-s
egm
ent d
is
pla
y
(3
) O
utpu
t vo
ltag
e of
I/F P.C.
board
If
(
1
) a
nd (2
), (3) a
re
d
iff
er
en
t,
an
er
ro
r
of
p
re
ss
ur
e
se
ns
or it
sel
f i
s c
ons
id
ered.
If
(2
) a
nd
(
3)
a
re
d
iff
er
en
t,
chec
k
in
ter
fac
e
P
.C.
bo
ard.
Val
ue c
an
be c
onfi
rm
ed b
y
7
-segm
ent
di
sp
lay
f
un
ction
on o
utdo
or
I/F P.C.
boar
d.
PD SW01 / 02 / 03 = 1/1/2
PS SW01 / 02 / 03 = 1/2/2
A
re ins
tal
led
pos
iti
ons
of
T
E
s
ens
or
an
d T
L
se
ns
or
corr
ec
t?
Ar
e
co
nn
ec
tio
n
of
TE
se
ns
or
co
nn
ec
to
r
an
d TL
s
e
ns
or
c
onn
ec
to
r
no
rm
al
?
Cor
rec
t in
sta
lle
d po
si
tion
s o
f
T
E
sen
sor
an
d T
L s
ens
or
.
Cor
rec
t co
nnec
tion of
co
nn
ec
to
rs
.
No
Yes
Outd
oor I/F
P.C. b
o
ar
d
T
E
se
nso
r
: CN520
, Gr
ee
n
T
L sen
sor
: CN523, Whi
te
No
Ye
s
Are service
valves of gas pipe and
liquid pipe of outdoor unit
fully opened?
No
Yes
Op
en s
er
vi
ce
va
lv
es
full
y.
4. 4-way va
lv
e trouble
Ch
eck ou
tdoor I/F P
.C. bo
ard.
Failure
Rep
lac
e
TE se
nso
r:
Outd
oo
r h
e
at
exch
an
ge
r te
m
p
sen
sor
T
L
se
ns
or
: T
em
p. s
ens
o
r be
tw
e
en
service
valves
of
liqu
id
pipe
and
P
M
V
1 /
2
* Se
e “
O
ut
do
or
u
nit
te
mp
era
tur
e s
ens
or
c
har
ac
te
ris
tic
s”
on
“
9-
7.
Se
ns
or
c
har
ac
te
ri
st
ic
s”
.
A
re
r
e
si
st
a
nc
e
ch
ar
ac
teri
st
ic
s of
T
L
se
ns
or
an
d
T
E
se
ns
or
no
rma
l?
No
Ye
s
Sens
or failure
Rep
lac
e
Yes
No
Check and replace 4-way
valve and coil.
Does discharge
refrigerant gas bypass
to suction side through
4-way valve?
126
A10-1510.indb 126
A10-1510.indb 126
2016/04/08 17:21:13
2016/04/08 17:21:13
