26
Check of outdoor unit
Compressor and/or outdoor fan motor doesn’t operate.
MU-GA80VB
Is there 230V AC to
between
L
-
N
on the
outdoor terminal block
?
No
Check the outdoor power supply
and connection of wiring.
Yes
Compressor
does not operate.
Yes
3minutes after the power supply
turns ON, is there 230V AC
between A1-A2 on the
compressor contactor (52C)?
Operate the unit in
COOL mode by
pressing the EMERGENCY
OPERATION switch.
Outdoor fan motor
does not operate.
No
Rectify the connecting
wire.
Rectify the connecting
wire.
Rectify the connecting
wire.
Check the compressor.
Refer to page 25.
Replace the compressor
contactor(52C).
Turn ON the power supply.
Yes
Is there 230V AC between
2/T1 on the compressor
contactor(52C) and
N
on the
outdoor terminal block?
Yes
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
Yes
No
Is there 230V AC between
1/L1 on the compressor
contactor(52C) and
N
on the
outdoor terminal block?
No
No
Yes
Yes
Yes
Is there 230V AC between
CN711
1
-
3
or
2
-
3
on the
deicer P.C. board?
w
Operate the unit in
COOL mode by
pressing the EMERGENCY
OPERATION switch.
No
Check the outdoor fan
motor. Refer to page 25.
Yes
Is there 230V AC CN730
1
-
3
on the deicer P.C.
board?
w
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
No
Is there 5V DC between
J101 - J401 on the deicer
P.C. board?
w
Is there 230V AC between
CN730
1
-
3
on the deicer
P.C. board?
w
+
Is there 5V DC between
J101 - J401 on the deicer
P.C. board?
w
+
w
Refer to page 29.
A
9-4. Troubleshoot flow
OB370-1.qxp 04.10.14 1:45 PM Page 26
