26
9-3. INSTRUCTION OF TROUBLESHOOTING
Indoor unit operates.
Outdoor unit does not
operate.
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
Indoor unit operates.
Outdoor unit does
not operate normally.
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. *
Unit dose not
operate
normally
in COOL or
HEAT mode.
(MSZ)
Indoor unit
operates, when
the emergency
operation switch
is pressed.
Indoor unit does
not operate,
when the emer-
gency operation
switch is pressed.
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/
compressor".
Refer to
"Check of R.V.
coil".
Refer to 9-6.
"Check of remote
controller and
indoor electronic
control P.C.
board".
1. Check indoor/outdoor
connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
Blink ON and
OFF at
0.5-second
intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal.
Upper lamp
2-time blink
Cause:
Indoor unit
• Trouble of
room tem-
perature /
indoor coil
thermistor.
Upper lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor.
Upper lamp
4-time blink
Cause:
Indoor unit
• Trouble of
indoor unit
control
system.
Upper lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power
system
abnormality.
Upper lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit.
Upper lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor
control
system.
Upper lamp
14-time blink
or more
Cause:
Outdoor unit
• Other
abnormality
Start
Refer to 9-6.
"How to
check
miswiring
and serial
signal error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
9-7."Test
point dia-
gram and
voltage".
Refer to 9-6.
"Check of
indoor fan
motor".
Replace the
indoor elec-
tronic control
P.C. board.
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.
Check "Flow
chart of the
detailed out-
door unit fail-
ure mode
recall
function."
* "Test Run operation" means the
operation within 30 minutes
after the emergency operation
switch is pressed.
Refer to outdoor unit service manual.
OBH732D
