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8-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
doesn't
Outdoor unit
operate
operates in
even in
only Test Run
Test Run
operation.
operation.
Check room
temperature
Refer to
thermistor.
"Check of
Refer to
inverter/
"Test point
compressor".
diagram and
voltage".
2-time flash
Flash on and
off at 0.5-
Cause:
second
Indoor unit
interval
• Trouble of
Cause:
room temp-
Indoor/
erature/
Outdoor unit
indoor coil
• Mis-wiring
thermistor
or trouble of
serial signal
Refer to D
Check room
temperature
"How to
thermistor
check mis-
and indoor
wiring and
coil thermis-
serial signal
tor.
error (When
Refer to
outdoor unit
"Test point
doesn't
diagram and
work)" on
voltage".
page 17.
As for outdoor unit MUZ type, refer to service manual OB346.
As for outdoor unit MXZ type, refer to service manual OB319.
Indoor unit operates.
Outdoor unit doesn't
operate normally.
Unit doesn't
Indoor unit
operate
operates, when
normal
the EMERGENCY
operation in
OPERATION
COOL or
switch is pressed.
HEAT mode.
Refer to
"Check of
Refer to
remote controller
"Check of
and receiver
R.V. coil".
P.C. board".
3-time flash
4-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
indoor fan
indoor unit
motor
control
system
Refer to A
Replace the
"Check of
indoor
indoor fan
electronic
motor" on
control
page 15.
P.C. board.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
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".
5-time flash
6-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Outdoor
• Trouble of
power
thermistor
system
in outdoor
abnormality
unit
Refer to
Refer to
"Check of
"Check of
inverter/
outdoor
compressor".
thermistors".
12
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Replace the
outdoor
electronic
control P.C.
board.
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