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10-3. INSTRUCTION OF TROUBLESHOOTING
1. Check of the unit.
*1 "Test Run operation" means the
operation within 30 minutes after
the emergency operation switch
is pressed.
If blinking of OPERATION
Start
INDICATOR lamp cannot be
checked, it can be checked with
failure mode recall function.
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 10-
pressor".
7. "Test point
diagram and
voltage".
POWER lamp
Blinking on and
off at 0.5-sec-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of se-
rial signal
Refer to 10-
6. "How to
check mis-
wiring and
serial signal
error".
OBH766G
Indoor unit operates.
Outdoor unit does
not operate normal-
ly.
Indoor unit
Unit does not
operates when
operate nor-
the emergency
mal operation
operation switch
in COOL or
is pressed.
HEAT mode.
Refer to
Refer to 10-6.
"Check of R.V.
"Check of remote
coil".
controller and
indoor electronic
control P.C.
board".
POWER lamp
POWER lamp
2-time blink
3-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble
• Trouble of
of room
indoor fan
temperature
motor
/ indoor coil
thermistor
Check room
Refer to 10-
temperature
6. "Check
thermistor
of indoor fan
and indoor
motor".
coil thermis-
tor. Refer to
10-7."Test
point diagram
and voltage".
*2 There is possibility that diesel explosion may occur due to the air mixied in
the refrigerant circuit.
First, ensure that there are no leakage points on the valves, flare connec-
tions, 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 normally, the indoor thermistor might have a problem, result-
ing in false detection.
Check both the indoor coil thermistor and the room temperature thermistor,
and replace faulty thermistor(s), if any.
(Do not start the operation again without repair to prevent hazards.)
Indoor unit does
POWER lamp on the
not receive the
indoor unit is blinking
signal from re-
ON and OFF.
mote controller.
Indoor unit does
not operate when
the emergency
operation switch
is pressed.
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 10-6.
"Check
of indoor P.C. board
and indoor fan motor".
POWER lamp
POWER lamp
4-time blink
5-time blink
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble
• Outdoor
of indoor
power sys-
tem abnor-
unit control
system
mality
Replace the
Refer to
indoor elec-
"How to
tronic control
check
P.C. board.
inverter/com-
pressor".
41
NOTE: The indoor unit
does not operate by
smartphone, refer
to 10-3.2."Check of
Wi-Fi Interface".
AIR PURIFYING
lamp
2-time blink
cause:
indoor unit
• Trouble of AIR
PURIFYING
power control
Refer to 10-6. "Check of
AIR PURIFYING power".
Refer to outdoor unit service manual.
POWER lamp
POWER lamp
7-time blink
6-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor con-
thermistor in
outdoor unit
trol system
Refer to
Replace the
"Check of
inverter P.C.
board or the
outdoor ther-
outdoor elec-
mistors".
tronic control
P.C. board.
POWER lamp
14-time blink
or more
Cause:
Outdoor unit
• Other ab-
normality
Indoor/
Outdoor unit
• Trouble of
thermistors
*2
• Check "Flow
chart of the de-
tailed outdoor
unit failure
mode recall
function."
• Check ther-
mistors.
Refer to "Test
point diagram
and voltage"
in the service
manual of
indoor and
outdoor unit.
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