T
ro
u
b
l
eshooting
4-64
S
ams
u
ng
El
ectronics
4-4-
20
SPI F
eed
b
a
ck E
rror
Indoor unit display
◑
(O
peration)
◑
(T
imer)
×(F
an)
◑
(F
i
l
ter)
×(
Defrost)
t
S
P
I
defect
Criteria
Cause of problem
t
C
heck
if
the
o
u
tp
u
t
of
S
P
I F
eedback
is
1
2
V
Outdoor unit display
1
.
H
ow
to
check
예
I
s
the
S
P
I
connector
of
an
indoor
u
nit
separated
from
P
CB?
C
onnect
the
connector
to
P
CB
and
reoperate
Y
es
No
Rep
l
ace
Main
P
CB
C
an
y
o
u
meas
u
re
1
2
V
from
#1, #4
power
with
S
P
I
connector
being
connected
?
Rep
l
ace
S
P
I
No
Y
es
#1
#4
