Mitsubishi MUH-GA50VB User Manual

26
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
Outdoor unit
operates only
in Test Run
operation. w
Outdoor unit
doesn't
operate
even in
Test Run
operation. w
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage".
Refer to
10-4. A
"Check of
outdoor unit".
Refer to
"Check of
remote controller
and receiver
P.C. board".
Flash on and
off at 0.5
-
second
intervals
Cause:
Indoor/
outdoor unit
• Mis-wiring
Refer to
10-4.D
"How to
check
mis-wiring
(When
outdoor unit
doesn't
work)".
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage".
Refer to
"Check of
indoor fan
motor".
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
1. Check indoor /
outdoor
connecting wire.
2. Refer to
"Check of indoor
electronic control
P.C. board".
Outdoor unit
doesn't
stop even
if indoor unit
stops.
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to
10-4. B
"Check of
outdoor unit".
Refer to
10-4. C
"Check of
R.V. coil".
Refer to indoor unit service manual.
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer to
10-4.F
"Check of
outdoor
thermistor".
Replace the
deicer
P.C. board.
10-time flash
Cause:
Outdoor unit
MUH-GA80VB
• Trouble of
low discharge
temperature
protection
MUH-GA80VB
Refer to
10-4.E
"Check of
LEV".
w"Test Run operation" means the operation within 30 minutes after EMERGENCY OPERATION switch is pressed.
10-2. INSTRUCTION OF TROUBLESHOOTING
OB368B-1.qxp 10.5.25 9:14 AM Page 26

Mitsubishi MUH-GA50VB Specifications

General

Brand	Mitsubishi
Model	MUH-GA50VB
Category	Air Conditioner
Language	English