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9-4. TROUBLESHOOTING CHECK TABLE
Not lighted
Blinking
OPERATION INDICATOR
Lighted
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and the following detection method has detected an abnormality (the first detection
after the power ON), the indoor electronic control P.C. board turns OFF the indoor fan motor with OPERATION INDICATOR
lamp flashing.
No.
Abnormal
point
Operation indicator lamp Symptom Condition Correspondence
1
Miswiring or
serial signal
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
The serial signal from the outdoor unit is not
received for a maximum of 6 minutes.
Refer to 9-6. "How to check miswiring
and serial signal error".
•
2
Indoor coil
thermistor
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
The indoor coil or the room temperature
thermistor is short or open circuit.
Refer to 9-7.the characteristics of indoor
coil thermistor, and the room tempera-
ture thermistor.
•
Room
temperature
thermistor
3
Indoor fan
motor
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
The rotational frequency feedback signal is not
emitted during the indoor fan operation.
Refer to 9-6. "Check of indoor fan mo-
tor".
•
4
Indoor con-
trol system
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
Replace the indoor electronic control
P.C. board.
•
5
Outdoor
power sys-
tem
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
It consecutively occurs 3 times that the
compressor stops for overcurrent protection or
start-up failure protection within 1 minute after
start-up.
Refer to "How to check of inverter/
compressor".
Refer to outdoor unit service manual.
Check the stop valve.
•
•
6
Outdoor
thermistors
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
The outdoor thermistors short or open circuit
during the compressor operation.
Refer to "Check of outdoor thermistor".
Refer to outdoor unit service manual.
•
7
Outdoor con-
trol system
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
It cannot properly read data in the nonvola-
tile memory of the inverter P.C. board or the
outdoor electronic control P.C. board.
Replace the inverter P.C. board or the
outdoor electronic control P.C. board.
Refer to outdoor unit service manual.
•
8
Other abnor-
mality
Left lamp fl ashes.
Indoor unit
and outdoor
unit do not
operate.
An abnormality other than above mentioned is
detected.
Confi rm the abnormality in detail using
the failure mode recall function for
outdoor unit.
•
0.5-second ON
0.5-second OFF
2-time flash
2.5-second OFF
3-time flash
2.5-second OFF
4-time flash
2.5-second OFF
5-time flash
2.5-second OFF
6-time flash
2.5-second OFF
7-time flash
2.5-second OFF
14-time flash
2.5-second OFF