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10-3. INSTRUCTION OF TROUBLESHOOTING
1. Check of the unit.
*1 "Test Run operation" means the
If blinking of OPERATION
INDICATOR lamp cannot be
Start
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
Refer to "How
Check room
temperature
to check
thermistor.
inverter/
Refer to 10-7.
compressor".
"Test point
diagram and
voltage".
Upper lamp
Upper lamp
Blink on and off
2-time blink
at 0.5-second
cause:
indoor unit
intervals
• Trouble of AIR
Cause:
PURIFYING
Indoor/Outdoor
power control
unit
• Miswiring or
trouble of serial
signal
Refer to
Refer to 10-6.
"How to
10-6.
"Check of AIR
check miswir-
PURIFYING
ing and serial
power".
signal error".
OBH932
operation within 30 minutes after
the emergency operation switch
is pressed.
Indoor unit operates.
Indoor unit does not
Outdoor unit does
receive the signal from
not operate normally.
remote controller.
Unit does not
Indoor unit
operate
operates, when
normal
the emergency
operation in
operation switch
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
2-time blink
3-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room temper-
indoor fan
ature / indoor
motor
coil thermistor
Check room
Refer to 10-6.
temperature
"Check of
thermistor and
indoor fan
indoor coil
motor".
thermistor.
Refer to 10-7.
"Test point
diagram and
voltage".
*2 There is possibility that diesel explosion may occur due to the air mixed 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.
NOTE: Do not start the operation again without repair to prevent hazards.
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/outdoor
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
5-time blink
4-time blink
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble of
• Outdoor
indoor unit
power sys-
control
tem
system
abnormality
Refer to "How
Replace the
indoor elec-
to check
tronic control
inverter/
P.C. board.
compressor".
33
NOTE: The indoor unit does not
operate by smartphone,
refer to 10-3.2."Check of
Wi-Fi interface".
Refer to outdoor unit service manual.
Upper lamp
Upper lamp
7-time blink
6-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
thermistor in
outdoor con-
outdoor unit
trol system
Refer to
Replace the
"Check of out-
inverter P.C.
door
board or the
thermistors".
outdoor elec-
tronic control
P.C. board.
Upper 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 function."
• Check
thermistors.
Refer to "Test
point diagram
and voltage"
in the service
manual of
indoor and
outdoor unit.
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Troubleshooting
