Hitachi RAS-E10H2 - Page 51

AC22 0-230V
C012
C013
14
• T
he v
oltage specification of the po
wer circuit is as f
ollo
wer circuit is as follower circuit is as f
ws
.
<Chec
k points>
Output
Vo
ltage
Main load
Measuring points
Potential failure modes
spec.
+
–
12V
11-13V
MAIN
P.
W.
B.
J28 (“0V” display)
LD301 blinks 3 or 4
times, then stops.
J25 (“12V” display)
J4 (“15V” display)
R23
5V
4.5-6V
MAIN
P.
W.
B.
J20 (“5V” display)
J28 (“0V” display)
The unit won’t operate
MAIN P
.W
.B. error
B-12V
11-16V
Expansion
va
lv
e R
25 (“B-12V
”
displ
ay
) R
25 (“B-0V
”
displ
ay
)
LD301 blinks 5 times;
Expansion valve error
15V
14-17V
DC fan motor (CN24)
C06- side
LD301 blinks 3 times,
or 4 times, or 12 times.
MAIN
P.
W.
B.
35V
33.5-38V
Indoor unit electr
ical par
ts
R23(“D-0V” display)
J5(“15-0V” display)
I
ndoor unit won’t operate.
Indoor / Outdoor miss
conection.
(T
er
(Ter(T
minal
C,
D)
(“
C-35V
” display)
Te
rm
inal D (red line)
Reversing valve (CN2)
Ter
minal C (blo
wn line)
•
Chec
k
each
v
oltage
.
If
each
v
oltage
meets
the
v
oltage
specification
abo
ve
,
the
po
w
er
circuit
is
nor
mal.
•
If an
y error is
fo
und after chec
king, rem
ov
e all loads and rechec
k each v
oltage
.
If no error is f
ound in this step
, the po
wer circuit is nor
mal.
Chec
k the remo
ve
d loads
.
If an
y error is f
ound in this step
, the po
w
er circuit has an
y f
ailure
.
Replace the MAIN
P
Replace the MAIN PReplace the MAIN
.W
P.W P
.B
.
A
shor
t-circuited
load
ma
y
cause
an
output
error
not
only
in
the
load
bu
t
also
in
the
others
.
Be
sure
to
chec
k all outputs of the loads
k all outputs of the loads.k all outputs of the loads
Be
sure
to
wait
15
minutes
or
more
in
order
to
discharge
all
the
remaining
voltage
in
the
circuit
to
connect/disconnect the wiring, other wise, the components may be damaged
.
• T
he failures of the loads are as follows.
Failed
output
35V
15V
12V
, 5V
12V, 5V12V
Cr
iter
ion
Connect
the
cab
le
correctly
.
correctly.correctly
Remo
ve
the
connection
cab
le
and
measure
the
v
oltage
.
If
the
v
oltage
is
correct,
chec
k
the
electr
ical
par
ts
fo
r the indoor unit.
Remo
ve
the
CN2
and
measure
the
v
oltage
.
If
the
voltage is correct, check the reversing valve.
Remove
the
CN24
and
measure
the
voltage.
If
the
v
oltage
is
correct,
chec
k
the
DC
fa
n
moto
r.
this step
.
Possible causes
Reversed connection of the cable.
Electrical
part
for
the
indoor
unit
has
a failure.
Short-circuited reversing valve
DC fan motor error
Main
P.
W.
B.
error
Also, check the main P.W.B. 1A fuse for blow out in
Check the main P
.W
.B.
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