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9-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit oper-
ates.
Outdoor unit
does not operate.
Outdoor unit
Outdoor unit
operates only
does not
in Test Run
operate even
operation.
in Test Run
operation.
Check room
Refer to "How
temperature
to check
thermistor.
inverter/com-
Refer to 9-7.
pressor".
"Test point
diagram and
voltage".
Upper lamp
Upper lamp
Flash ON
2-time ash
and OFF at
Cause:
0.5-second
Indoor unit
intervals
• Trouble
Cause:
of room
Indoor/Outdoor
temperature
unit
/ indoor coil
• Miswiring or
thermistor.
trouble of se-
rial signal.
Refer to
Check room
9-6. "How
temperature
to check mis-
thermistor
wiring and
and indoor
serial signal
coil thermis-
error".
tor. Refer
to 9-7."Test
point diagram
and voltage".
OBH746B
Indoor unit operates.
Outdoor unit does
not operate normally.
Indoor unit
Unit does not
operates, when
operate nor-
EMERGENCY
mal operation
OPERATION
in COOL or
switch is pressed.
HEAT mode.
Refer to
Refer to 9-6.
"Check of R.V.
"Check of remote
coil".
controller and
indoor elec-
tronic control P.C.
board".
Upper lamp
Upper lamp
3-time ash
4-time ash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble
indoor fan
of indoor
motor.
unit control
system.
Refer to
Replace the
9-6. "Check
indoor elec-
of indoor fan
tronic control
motor".
P.C. board.
Indoor unit does
OPERATION INDICATOR
not receive the
lamp on the indoor unit is
signal from re-
ashing ON and OFF.
mote controller.
Indoor unit does
not operate, when
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 9-6.
"Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
Upper lamp
5-time ash
6-time ash
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".
19
"Test Run operation" means the
operation within 30 minutes af-
ter 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 ash
14-time ash
Cause:
or more
Outdoor unit
Cause:
• Trouble of
Outdoor unit
outdoor con-
• Other ab-
trol system.
normality
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."
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Table of Contents
Troubleshooting
