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10-3. INSTRUCTION OF TROUBLESHOOTING
1. Check of the unit.
*2 There is possibility that diesel explosion may occur due to the air mixed in the refrigerant circuit.
Start
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".
Upper lamp
Upper lamp
Blink on and
2-time blink
off at 0.5-sec-
Cause:
ond intervals
Indoor unit
Cause:
• Trouble
Indoor/Outdoor
of room
unit
temperature
• Miswiring or
/ indoor coil
trouble of se-
thermistor
rial signal
Refer to 10-
Check room
6. "How to
temperature
check mis-
thermistor
wiring and
and indoor
serial signal
coil thermis-
error".
tor. Refer to
10-7."Test
point diagram
and voltage".
OBH788E
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.
NOTE: Do not start the operation again without repair to prevent hazards.
Indoor unit does
Indoor unit operates.
not receive the
Outdoor unit does
signal from re-
not operate normally.
mote controller.
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".
Upper lamp
Upper lamp
4-time blink
3-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble
• Trouble of
of indoor
indoor fan
unit control
motor
system
Refer to 10-
Replace the
6. "Check
indoor elec-
of indoor fan
tronic control
motor".
P.C. board.
OPERATION INDICATOR
lamp on the indoor unit is
blinking ON and OFF.
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".
Upper lamp
Upper lamp
6-time blink
5-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Outdoor
thermistor in
power sys-
outdoor unit
tem abnor-
mality
Refer to
Refer to
"How to
"Check of
check
outdoor ther-
inverter/com-
mistors".
pressor".
35
NOTE: The indoor unit
does not oper-
ate by smart-
phone, refer to
10-3.2."Check of
Wi-Fi Interface".
*1 "Test Run operation" means
the operation within 30 minutes
after the emergency operation
switch is pressed.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Refer to outdoor unit service manual.
Upper lamp
Upper lamp
7-time blink
14-time blink
Cause:
or more
Outdoor unit
Cause:
• Trouble of
Outdoor unit
outdoor con-
• Other ab-
trol system
normality
Indoor/
Outdoor unit
• Trouble of
thermistors
*2
Replace the
• Check "Flow
inverter P.C.
chart of the
board or
detailed
the outdoor
outdoor unit
electronic
failure mode
control P.C.
recall func-
board.
tion."
• Check ther-
mistors.
Refer to
"Test point
diagram and
voltage" in
the service
manual of
indoor and
outdoor unit.
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