22
9-3. 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. *
Outdoor unit
does not
operate even
in Test Run
operation. *
Unit does
not operate
normally in
COOL or
HEAT mode
operation.
Indoor unit oper-
ates, when the
emergency oper-
ation switch is
pressed.
Indoor unit does
not operate,
when the emer-
gency operation
switch is pressed.
Check room
temperature
thermistor.
Refer to 9-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/
compressor".
Refer to
"Check of
R.V. coil".
Refer to 9-6.
"Check of
remote controller
and receiver
P.C. board".
1. Check indoor/outdoor
connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6.
"Check of indoor
electronic control P.C.
board and indoor fan
motor".
Left lamp
Blink on and
off at 0.5-sec
-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Left lamp
2-time blink
Cause:
Indoor unit
• Trouble of
room tem-
perature /
indoor coil
thermistor
Left lamp
3-time blink
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Left lamp
4-time blink
Cause:
Indoor unit
• Trouble of
indoor unit
control sys-
tem
Left lamp
5-time blink
Cause:
Outdoor unit
• Outdoor
power sys-
tem abnor-
mality
Left lamp
6-time blink
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Left lamp
7-time blink
Cause:
Outdoor unit
• Trouble of
outdoor con-
trol system
Left lamp
14-time blink
Cause:
Outdoor unit
• Other
abnormality
Start
Refer to 9-6.
"How to
check miswir-
ing and serial
signal error".
Check room
temperature
thermistor
and indoor
coil thermis-
tor. Refer to
9-7."Test
point diagram
and voltage".
Refer to 9-6.
"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
thermistors".
Check "Flow
chart of the
detailed out-
door unit fail-
ure mode
recall func-
tion."
* "Test Run operation" means the
operation within 30 minutes after
the emergency operation switch
is pressed.
Refer to outdoor unit service manual.
Replace the
inverter P.C.
board or the
outdoor elec-
tronic control
P.C. board.
OBH501D