28
Start
Indoor unit
operates.
Outdoor unit
does not
operate.
Indoor unit does
not receive
the signal from
remote controller.
OPERATION INDICATOR
lamp on the indoor unit is
blinking ON and OFF.
Outdoor unit
operates only
in Test Run
operation.
Outdoor unit
does not
operate
even in
Test Run
operation.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Indoor unit
does not operate,
when
EMERGENCY
OPERATION
switch is pressed.
Check room
temperature
thermistor.
Refer to 11-7.
"Test point
diagram and
voltage".
Refer to
"How to check
inverter/
compressor".
Refer to 11-6.
"Check of
remote controller,
display receiver
P.C. board and
indoor control
P.C. board".
1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to 11-6.
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Unit does
not operate
normal
operation in
COOL or
HEAT mode.
Refer to
"Check of
R.V. coil".
Left lamp
Blink ON and
OFF at
0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Miswiring
or trouble
of serial signal
Left lamp
2-time blink
Cause:
Indoor unit
• Trouble of
room temp-
erature/
indoor coil
thermistor
Left lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Left lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Left lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor
in outdoor
unit
Left lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to 11-7.
"Test point
diagram and
voltage".
Refer to
"How to check
the inverter/
compressor".
Refer to
"Check of
outdoor
thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Left lamp
14-time blink
or more
Cause:
Outdoor unit
• Other
abnormality
Left lamp blinks
3 times, then
right lamp
lights on.
Cause:
Indoor unit
• Refrigerant
leakage
(Sensor detection)
Check
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."
• Turn off the
power after
FAN operation
is finished.
(FAN operation
continues for 3
hours.)
• Check the indoor
unit to detect the
part where re-
frigerant leaks.
• Repair the part
where refrigerant
leaks.
• Turn on the
power again.
• Replace the re-
frigerant sensor
if the problem is
not fixed.
Left lamp blinks
2 times, then
right lamp
lights on.
Cause:
Indoor unit
• Refrigerant
sensor
Connect the
connector of the
refrigerant sensor
properly.
Replace the
refrigerant sensor.
Refer to 11-6.
"How to
check the
miswiring
and serial
signal error
(when
outdoor unit
does not
work)".
Refer to 11-6.
"Check of
indoor fan
motor".
Left lamp
4-time blink
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 does
not operate normally.
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
"Test Run operation" means the
operation within 30 minutes after
EMERGENCY OPERATION switch
is pressed.
11-3. INSTRUCTION OF TROUBLESHOOTING
OBH843
