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9-3. INSTRUCTION OF TROUBLESHOOTING
*2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit.
Start
NOTE: Do not start the operation again without repair to prevent hazards.
Indoor unit operates.
Outdoor unit does not
operate.
Outdoor unit
Outdoor unit
operates only
does not
in Test Run
operate even
operation. *1
in Test Run
operation. *1
Check room
Refer to "How
temperature
to check
thermistor.
inverter/com-
Refer to 9-7.
pressor".
"Test point
diagram and
voltage".
Left lamp
Blink on and
off at 0.5-sec-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Refer to
9-6.
"How
to check
miswiring
and serial
signal error".
OBH736C
First, ensure that there are no leakage points on the valves, flare connections, etc. that allow the
air to flow into the refrigerant circuit, or no blockage points (e.g. clogged or closed valves) in the
refrigerant circuit that cause an increase in pressure.
If there is no abnormal point like above and the system operates cooling and heating modes nor-
mally, the indoor thermistor might have a problem, resulting in false detection.
Check both the indoor coil thermistor and the room temperature thermistor, and replace faulty
thermistor(s), if any.
Indoor unit operates.
Indoor unit does not
Outdoor unit does not
receive the signal
operate normally.
from remote controller.
Indoor unit
Unit does not
operates, when
operate nor-
the emergency
mally in COOL
operation switch
or HEAT mode
is pressed.
operation.
Refer to
Refer to 9-6.
"Check of R.V.
"Check of remote
coil".
controller and
indoor electronic
control P.C. board".
Left lamp
Left lamp
2-time blink
3-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room
indoor fan
temperature
motor
/ indoor coil
thermistor
Check room
Refer to
temperature
9-6.
"Check
thermistor
of indoor fan
and indoor
motor".
coil thermis-
tor. Refer to
9-7. "Test
point diagram
and voltage".
Left lamp of the OPERATION
INDICATOR lamp is blinking
ON and OFF.
Indoor unit does
not operate,
when the emer-
gency operation
switch is pressed.
1. Check indoor/out-
door 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".
Left lamp
Left lamp
4-time blink
5-time blink
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble of
• Outdoor
indoor unit
power
control
system
system
abnormality
Replace the
Refer to
indoor elec-
"How to
tronic control
check
P.C. board.
inverter/com-
pressor".
22
*1 "Test Run operation" means
the operation within 30 min-
utes after the emergency
operation switch is pressed.
If blinking of OPERATION
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
Refer to outdoor unit service manual.
Left lamp
Left lamp
6-time blink
7-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
thermistor in
outdoor
outdoor unit
control sys-
tem
Refer to
Replace the
"Check of
inverter P.C.
outdoor
board or
thermistors".
the outdoor
electronic
control P.C.
board.
Left lamp
14-time blink
or more
Cause:
Outdoor unit
• Other
abnormality
Indoor/
Outdoor unit
• Trouble of
thermistors
*2
• Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."
• Check
thermistors.
Refer to
"Test point
diagram and
voltage" in
the service
manual of
indoor and
outdoor unit.
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