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10-3. INSTRUCTION OF TROUBLESHOOTING
*1 "Test Run operation" means the
1. Check of the unit.
If blinking of OPERATION INDICA-
TOR lamp cannot be checked, it
Start
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 10-7.
pressor".
"Test point
diagram and
voltage".
Left lamp
Left 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
thermistor
serial signal
Refer to
Check room
10-6. "How
temperature
to check mis-
thermistor
wiring and
and indoor
serial signal
coil thermis-
error".
tor. Refer to
10-7."Test
point diagram
and voltage".
OBH831C
operation within 30 minutes after
the emergency operation switch
is pressed.
Indoor unit operates.
Outdoor unit does
not operate normally.
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".
Left lamp
Left lamp
3-time blink
4-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble
indoor fan
of indoor
motor
unit control
system
Refer to
Replace the
10-6.
indoor elec-
"Check of
tronic control
indoor fan
P.C. board.
motor".
*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
OPERATION INDICATOR
not receive the
lamp on the indoor unit is
signal from re-
blinking 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".
Left lamp
Left lamp
5-time blink
6-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Outdoor
power sys-
thermistor in
tem abnor-
outdoor unit
mality
Refer to
Refer to
"How to
"Check of
check
outdoor ther-
inverter/com-
mistors".
pressor".
30
Refer to outdoor unit service manual.
Left lamp
Left 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 de-
tailed outdoor
board or
unit failure
the outdoor
mode recall
electronic
function."
control P.C.
• Check ther-
board.
mistors.
Refer to "Test
point diagram
and voltage"
in the service
manual of
indoor and
outdoor unit.
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