33
10-3. 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. *1
Outdoor unit
does not
operate even
in Test Run
operation.*1
Unit does not
operate
normal
operation in
COOL or
HEAT mode.
Indoor unit
operates, when
the emergency
operation switch
is pressed.
Indoor unit does
not operate, when
the emergency
operation switch
is pressed.
Check room
temperature
thermistor.
Refer to 10-7.
“Test point
diagram and
voltage”.
Refer to “How
to check
inverter/
compressor”.
Refer to
“Check of R.V.
coil”.
Refer to 10-6.
“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 10-6. “Check
of indoor P.C. board
and indoor fan motor”.
Start
*1 “Test Run operation” means the
operation within 30 minutes after
the emergency operation switch
is pressed.
Refer to outdoor unit service manual.
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 temper-
ature / 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 sys-
tem
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 con-
trol system
Upper lamp
14-time blink
or more
Cause:
Outdoor unit
• Other
abnormality
Indoor/
Outdoor unit
• Trouble of
thermistors
Refer to 10-6.
“How to
check miswir-
ing and serial
signal error”.
Check room
temperature
thermistor and
indoor coil
thermistor.
Refer to 10-7.
“Test point
diagram and
voltage”.
Refer to 10-6.
“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 out-
door
thermistors”.
Replace the
inverter P.C.
board or the
outdoor elec-
tronic control
P.C. board.
• 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.
NOTE
: The indoor unit does not
operate by smartphone,
refer to 10-3.2.”Check of
Wi-Fi interface”.
1. Check of the unit.
*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.
*2
Upper lamp
2-time blink
cause:
indoor unit
• Trouble of AIR
PURIFYING
power control
Refer to
10-6.
“Check of AIR
PURIFYING
power”.
OBH932
