34
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.
NOTE
: The indoor unit
does not operate by
smartphone, refer
to 10-3.2."Check of
Wi-Fi module".
Indoor unit operates.
Outdoor unit does
not operate normal-
ly.
Indoor unit does
not receive the
signal from re-
mote controller.
POWER 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 nor-
mal 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/com-
pressor".
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/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
Blinking on and
off at 0.5-sec
-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of se-
rial signal
POWER lamp
2-time blink
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
POWER lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor
POWER lamp
4-time blink
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
POWER lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power sys-
tem abnor-
mality
POWER lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
POWER lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor con-
trol system
POWER lamp
14-time blink
or more
Cause:
Outdoor unit
• Other ab-
normality
Indoor/
Outdoor unit
• Trouble of
thermistors
Start
Refer to 10-
6. "How to
check mis-
wiring and
serial signal
error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. 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/com-
pressor".
Refer to
"Check of
outdoor ther-
mistors".
• 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.
*1 "Test Run operation" means the
operation within 30 minutes after
the emergency operation switch
is pressed.
Refer to outdoor unit service manual.
AIR PURIFYING
lamp
2-time blink
cause:
indoor unit
• Trouble of AIR
PURIFYING
power control
Refer to 10-6. "Check of
AIR PURIFYING power".
1. Check of the unit.
Replace the
inverter P.C.
board or the
outdoor elec-
tronic control
P.C. board.
*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.)
*2
OBH902A
