18
No.
1
3
5
6
Symptom
Operation indicator lamp
Condition
Correspondence
POWER lamp flashes.
0.5-second ON
0.5-second OFF
Mis-Wiring
or serial
signal
Outdoor
power
system
Outdoor
thermistors
Outdoor
control
system
Indoor coil
thermistor
When the serial signal form the outdoor unit is
not received for a maximum of 6 minutes.
When it consecutively occurs 3 times that the
compressor stops for overcurrent 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 the outdoor electronic control P.C. board.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
• Refer to "How 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.
• Refer to 9-6.
D
"How to check
mis-wiring and serial signal
error".
4
Indoor fan
motor
7
Abnormal
point
Outdoor unit
does not
operate.
Room
tempera-
ture
thermistor
POWER 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 9-7.the
characteristics of indoor coil
thermistor, and the room
temperature thermistor.
POWER lamp flashes.
3-time flash
2.5-second OFF
When the rotational frequency feedback
signal is not emit during the indoor fan
operation.
• Refer to 9-6.
A
"Check of
indoor fan motor".
Indoor unit
and outdoor
unit do not
operate.
POWER lamp flashes.
5-time flash
2.5-second OFF
POWER 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
abnonmality
An abnormality other than above mentioned is
detected.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor unit.
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
8
Outdoor
control
system
When it cannot properly read data in the
nonvolatile memory of the inverter P.C. board
or 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.
POWER lamp flashes.
7-time flash
2.5-second OFF
POWER lamp flashes.
14-time flash
2.5-second OFF
POWER lamp lights up
9-4. Troubleshooting check table
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.
Lighted
Blinking
Not lighted
· Flashing of POWER lamp indicates abnormalities.
OB371B--1qxp 06.5.10 2:01 PM Page 18
