29
NOTE:
When the indoor unit has started operation and the above failures are detected (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.
Left lamp flashes.
7-time flash
2.5-second OFF
Left lamp flashes.
14-time flash
2.5-second OFF
No.
1
3
6
7
Symptom
Operation indicator lamp
Condition
Remedy
Left lamp flashes.
0.5-second ON
0.5-second OFF
Miswiring
or serial
signal
Outdoor
power
system
Outdoor
thermistors
Outdoor
control
system
Indoor coil
thermistor
When the serial signal from the outdoor unit is
not received for a maximum of 6 minutes.
The compressor stops 3 times consecutively
for over current protection or start-up failure
protection within 1 minute after start-up.
When the outdoor thermistors short or open
circuit during the compressor operation.
When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or of the outdoor electronic control P.C. board.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
• Refer to "Check of inverter/
compressor".
Refer to outdoor unit service
manual.
Check the stop valve.
• Replace the inverter P.C.
board or the outdoor
electronic control P.C. board.
Refer to outdoor unit service
manual.
4 Indoor fan
motor
8
Abnormal
point
Room
tempera-
ture
thermistor
Left lamp flashes.
2-time flash
2.5-second OFF
When the indoor coil or the room temperature
thermistor is short or open circuit.
• Refer to the characteristics of
indoor coil thermistor, and the
room temperature thermistor
on 10-7.
Left lamp flashes.
3-time flash
2.5-second OFF
When the rotational frequency feedback
signal is not emitted during the indoor fan
operation.
• Refer to 10-6. "How to check
miswiring and serial signal
error".
• Refer to 10-6. -1, -2
"Check of indoor fan motor".
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Left lamp flashes.
5-time flash
2.5-second OFF
Left lamp flashes.
6-time flash
2.5-second OFF
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
Other
abnormality
An abnormality other than above mentioned is
detected.
• Confirm the abnormality in
detail using the failure mode
recall function.
Refer to outdoor unit service
manual.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
9
Left lamp flashes.
15-time flash
2.5-second OFF
• Refer to 10-6. "Check of
damper".
Indoor
damper
When the damper is not located
at the designated position.
Indoor unit
and outdoor
unit do not
operate.
10
5
Left lamp flashes.
4-time flash
2.5-second OFF
Indoor
control
system
When it cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
Indoor unit
and outdoor
unit do not
operate.
• Replace the indoor electronic
control P.C. board.
Outdoor
control
system
When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or of the outdoor electronic control P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor
electronic control P.C. board.
2
Outdoor unit
does not
operate.
Left lamp lights up
10-4. TROUBLESHOOTING CHECK TABLE
NOTE:
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
OPERATION INDICATOR
Not lighted
Blinking
Lighted
· Flashing of OPERATION INDICATOR lamp (left-hand side lamp)
indicates abnormalities.
Self check table
OB409E
