Service manual

24
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. w
Outdoor unit
doesn't
operate
even in
Test Run
operation. 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 10-7.
"Test point
diagram and
voltage".
Refer to
"How to check
inverter/
compressor".
Refer to 10-6.B
"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 10-6.C
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
PLASMA lamp 2-time flash
cause:
Indoor unit
• Trouble of PLASMA
operation
Unit doesn't
operate
normal
operation in
COOL or
HEAT mode.
Refer to
"Check of
R.V. coil".
POWER lamp
Flash on and off
at 0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Miswiring
or trouble
of serial signal
POWER lamp
2-time flash
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
POWER lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
POWER lamp
5-time flash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
POWER lamp
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
POWER lamp
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer to 10-6.
D "How to
check of
miswiring
and serial
signal error
.
All lamps
Flash on and off
at 0.5-second
intervals
Cause:
Indoor unit
• The horizontal
vane is not
installed
correctly.
Refer to 10-6.
E "Check of
installation of
the horizontal
vane".
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to 10-7.
"Test point
diagram and
voltage".
Refer to 10-6.
A "Check of
indoor fan
motor".
Refer to
"How to check
inverter/
compressor".
Refer to
"Check of
outdoor
thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
POWER lamp
14-time flash
Cause:
Outdoor unit
• Other
abnormality
Check
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."
POWER lamp
4-time flash
Cause:
Indoor unit
• Trouble of
indoor unit
control
system
Replace the
indoor
electronic
control
P.C. board.
Refer to outdoor 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.
Refer to 10-6.F"Check of
PLASMA operation".
10-3. INSTRUCTION OF TROUBLESHOOTING
OBH488A-1.qxp 07.9.25 11:34 AM Page 24