148
Heati
ng op
eratio
n
Do
es he
at
in
g
in
d
o
or
f
an
no
rm
a
lly
op
er
a
te?
Is
in
do
or
P
M
V
no
rma
l?
Is
ch
ec
k
va
lv
e
of m
ain
di
sc
ha
rg
e
pi
p
e
no
rm
al
?
Is
the
re
any
in
te
rfe
renc
e
of
h
ea
t-
e
xc
ha
ng
in
g
of
in
do
or u
n
it?
1.
Fil
te
r cl
og
gi
ng
2.
H
eat
ex
ch
an
ge
r
cl
og
gi
ng
3.
Ai
r s
h
or
t c
irc
ui
t
Are a
n
y
i
ndo
or
u
n
its in di
ffer
en
t
ref
rige
ran
t c
irc
ui
t
co
nn
ec
ted
?
Re
fr
ig
erant
over
cha
rge
,
c
lo
g
gin
g, pi
pe b
re
a
ka
ge,
ab
normal
overloa
d
Is
c
hec
k va
lv
e
of ma
in
di
sc
ha
rg
e
pi
pe
no
rm
al
?
Is the
re
cl
og
gi
n
g in
an
y
va
lv
es
?
Is
co
nn
ec
tor
co
nn
ec
tion
, c
o
nd
en
se
r
or
fan
m
oto
r n
o
rm
al
?
Are
ch
ara
c
te
ri
sti
cs
o
f
se
ns
or
T
C
2 a
n
d
T
C
J
re
si
st
anc
e
nor
m
a
l?
Ch
ec
k i
n
doo
r P
.C. b
o
ard.
Fau
lty
Re
pla
c
e
Repa
ir faul
ty parts.
Re
pai
r c
he
ck
va
lv
e.
Repl
ace
E
lim
in
at
e the
in
ter
fer
en
ce.
Re
pla
ce P
M
V
bod
y.
Chec
k and
c
o
rr
ect
wirin
g
.
Repl
ac
e TC2 or
T
C
J
se
nso
r.
Rep
air fa
ulty
pa
rt
s.
(Che
ck it
using the
mi
swiring check fun
c
tion
o
f
th
e o
u
td
oo
r un
it
.)
No
Ye
s
Yes
Ye
s
No
No
Yes
Ye
s
No
No
No
Ye
s
Ye
s
No
Yes
No
Ye
s
No
Are
se
rvi
ce
v
a
lv
es
fu
lly
op
en
ed
?
Are
ch
ara
cteri
sti
cs
o
f h
igh
-
p
ress
ur
e
se
ns
or
no
rm
al?
Re
set
power supp
ly, and
sta
rt a
tes
t op
er
at
io
n
co
rr
esp
onde
d to t
he s
eas
on.
Cool
in
g ope
ra
tion
Do
es
co
ol
in
g o
ut
d
oo
r fa
n
no
rm
al
ly
op
er
a
te?
Is
th
ere
an
y fan
c
rac
k
or comin
g
-o
ff?
Is ou
tdo
or
PM
V norm
al
?
1. Conn
ec
to
r
co
nn
ec
tio
n
2.
Wi
rin
g
3.
C
oi
l
4.
Val
ve
b
ody
5.
O
ut
d
oo
r I/
F P.
C. bo
ard
Is the
re
an
y
in
terf
ere
n
ce
o
f h
e
at
-
ex
ch
an
gin
g
of o
utd
oo
r un
it?
1.
He
at ex
ch
ang
er cl
og
gin
g
2.
Air
sh
ort
ci
rcu
it
Is
SV
4 c
irc
ui
t n
ormal
?
Is
ch
ec
k va
lv
e o
f
m
a
in
d
is
ch
a
rg
e p
ipe
no
rm
al
?
R
ef
rig
er
a
nt
o
ve
rc
har
ge, c
lo
ggi
ng, p
ipe
breakage,
abno
rm
al ove
rlo
ad
Ye
s
Ye
s
Yes
Ye
s
Yes
Yes
Ye
s
No
No
No
Ye
s
No
No
No
No
Co
oli
ng
To
(B
)
He
atin
g
To (C)
* 1
. Pr
es
su
re
by
pre
ss
ur
e ga
uge
(Che
ck
jo
int
)
2.
Pr
es
sur
e d
is
pla
y o
n 7-
se
gmen
t di
spl
ay
3.
O
ut
put v
ol
tage
of I/F P
.C. bo
ar
d
If 1 a
nd 2
, 3
ar
e d
iff
er
en
t, an
e
rr
or
o
f p
re
ss
ur
e
s
e
ns
o
r
is
c
ons
id
er
ed.
If 2
and
3 are d
ifferen
t, check
I/
F
P.
C
. bo
ar
d.
Op
en
se
rv
ic
e
va
lv
es
fu
lly
.
Ch
eck
pa
rt
s.
Fa
ilur
e
Repl
ace
Repai
r faul
ty
p
ar
ts.
Re
pai
r f
ault
y p
art
s.
Repai
r outdo
or
PMV
.
(C
on
nect
or
con
ne
ction
, fa
n
IP
D
U
, fan
moto
r, cab
ling)
E
lim
ina
te th
e in
ter
fer
enc
e.
Repai
r SV
4 c
ircu
it.
Re
pair
c
hec
k val
ve
.
Re
pla
ce
(Co
il er
ror
, c
lo
g
gin
g
,
di
scon
nect
io
n of
wire,
etc.
)
Is
SV
2 c
irc
ui
t n
o
rmal
?
Yes
No
Repai
r SV
2 circu
it.
(Co
il er
ror
, c
lo
g
gin
g
,
di
scon
nect
io
n of
wire,
etc.
)
Co
nnec
tors:
P
M
V1
: CN300
No
(B)
7
. Ou
tdoo
r I
/F
P.C. b
oar
d er
ro
r
8
. Op
er
atio
n er
ro
r of c
hec
k
val
ve
of m
ain
di
sc
har
ge p
ipe
9
. Ref
ri
g
er
ant ov
er
charge
es
ua
C
1.
P
d
s
ens
or
er
ro
r
2. S
e
rv
ic
e va
lv
e cl
os
ed
.
3
. Indo
or / out
door fan
err
o
r
4
. Indo
or / out
door P
M
V cl
o
gging
5
. Indo
or / out
door he
at exch
ange
r
cl
og
gi
ng
6
. SV2, SV4 circuit error
e
m
an
ed
oc
kc
eh
C
ed
oc
kc
eh
C
High-
pressure
pr
ote
ctive
ope
ration
127
