T
es
t
m
et
h
od
/ re
m
edy
H
or
iz
onta
l
louv
er
ca
n n
ot
re
volv
e
C
omp
re
ss
or
is
n
oi
sy
T
oo
co
ol
Un
it
ru
ns
co
nti
nu
ou
sly
bu
t
in
su
ffi
ci
en
t
co
oli
ng
Low
su
ct
ion
pr
es
su
re
H
ig
h s
uct
ion
pr
es
su
re
Low
dis
char
ge
p
re
ss
ur
e
H
ig
h d
ischarg
e
pr
es
su
re
C
omp
re
ss
or
sh
or
t-cyc
le
s d
ue
to
ove
rloa
d
Un
it
ru
ns
,
bu
t
sh
or
tly
sto
ps
C
ond
en
se
r (Ou
td
oo
r)
fa
n will
no
t
sta
rt
Evap
or
ato
r (i
nd
oo
r)
fa
n will
not
sta
rt
C
omp
re
ss
or
a
nd
co
nd
en
se
r (out
doo
r)
fa
n will
not
sta
rt
C
omp
re
ss
or
will
not
sta
rt
bu
t
fa
ns
ru
n
Un
it
wi
ll
not
sta
rt
Poss
ibl
e
cau
ses
o
f
tro
uble
2
.Fiel
d M
ainte
na
n
ce
Test voltage
☆
Power failure
E
lect
rical
C
ircu
it
Inspect fuse type & size
☆
Blown fuse or varistor
Inspect connections - tighten
☆
☆
Loose connections
Test circuits with tester
☆
☆
☆
☆
☆
☆
Shorted or broken wires
Test continuity of safety device
☆
Safety device opens
Test continuity of thermostat / sensor & wiring
☆
☆
☆
☆
Faulty thermostat / room temperature sensor
Place the temperature sensor at the central of
the air inlet grille
☆
Wrong setting place of temperature sensor
Check control circuit with tester
☆
Faulty transformer
Check capacitor with tester
☆
☆
☆
Shorted or open capacitor
Test continuity of coil & contacts
☆
☆
☆
☆
Faulty magnetic contactor for compressor
Test continuity of coil & contacts
☆
☆
Faulty magnetic contactor for fan
Test voltage
☆
☆
Low voltage
Replace the stepping motor
☆
Faulty stepping motor
Check resistance with multimeter
☆
Shorted or grounded compressor
Check resistance with multimeter
☆
☆
Shorted or grounded fan motor
P
ag
e
68
