Mitsubishi MUH-GA50VB User Manual

29
Is there 230V AC to
between
L-N on the
outdoor terminal block
?
No
Check the outdoor power supply
and connection of wiring.
Ye s
Compressor
does not operate.
Ye s
3minutes after the power
supply turns ON, is there
230V AC between A1-A2 on
the compressor contactor
(52C)?
Operate the unit in
COOL or HEAT 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 10-3.
Replace the compressor
contactor(52C).
Turn ON the power supply.
Ye s
Is there 230V AC between
2/T1 on the compressor
contactor(52C) and N on the
outdoor terminal block?
Ye s
Replace the
deicer P.C. board.
Replace the
deicer P.C. board.
No
Ye s
No
Is there 230V AC between
1/L1 on the compressor
contactor(52C) and N on the
outdoor terminal block?
No
No
Ye s
Ye s
Ye s
Is there 230V AC between
CN711 2-3 (MUH-GA60VB)/
CN711 1-3 or 2-3
(MUH-GA80VB) on the
deicer P.C. board? w
Operate the unit in
COOL or HEAT mode by
pressing the EMERGENCY
OPERATION switch.
No
Check the outdoor fan
motor. Refer to 10-3.
Ye s
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 10-5.
MUH-GA60VB
MUH-GA80VB
OB368B-1.qxp 10.5.25 9:14 AM Page 29

Mitsubishi MUH-GA50VB Specifications

General

Brand	Mitsubishi
Model	MUH-GA50VB
Category	Air Conditioner
Language	English