MITSUBISHI ELECTRIC MUZ-GB50VA - Manual (Page 20)

20
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Indoor unit
doesn't receive
the signal from
remote controller.
OPERATION
INDICATOR
lamp on the indoor
unit is flashing on
and off.
Outdoor unit
operates only
in Test Run
operation.
(Refer to 8-3.)
w
Outdoor unit
doesn't
operate
even in
Test Run
operation.
(Refer to 8-3.)
w
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed. Indoor unit
doesn't operate,
when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage". Refer to 10-6. A
"How to check
inverter/
compressor".
Refer to
"Check of
remote controller
and receiver
P.C. board".
1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to 10-6. C
"Check of
R.V. coil".
Left lamp
Flash on and
off at
0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring or
trouble of
serial signal. Left lamp
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor Left lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor Left lamp
5-time flash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality Left lamp
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit Left lamp
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer to 10-6. H
"How to check
mis-wiring
and serial
signal error.
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to "Test
point diagram
and voltage". Refer to
"Check of
indoor fan
motor". Refer to 10-6. A
"How to check
inverter/
compressor".
Refer to 10-6. B
"Check of
outdoor
thermistors".
Replace
inverter P.C.
board or out-
door control
electronic
control P.C.
board.
Left lamp
14-time flash
Cause:
Outdoor unit
• Other
abnormality
Check 10-2.2.
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."
Left lamp
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
Refer to indoor unit
service manual.
Indoor unit operates.
Outdoor unit doesn't
operate normally.
If blinking of OPERATION
INDICATOR lamp cannot
be checked, it can be checked
with failure mode recall function.
w "Test Run operation" means
the operation within 30 minutes
after EMERGENCY OPERATION
switch is pressed.
All lamps
Flash on and off
at 0.5-second
intervals
Cause:
Indoor unit
• The horizontal
vane is not
installed
correctly.
Refer to
"Check of
installation of
the horizontal
vane".
10-3. Instruction of troubleshooting
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