14
No.
1
Symptom
Operation indicator lamp
Detection method
Correspondence
Indoor coil
thermistor
2
Indoor fan
motor
Abnormal
point
Room
tempera-
ture
thermistor
Left lamp flashes.
2-time flash
2.5-second OFF
The indoor coil or the room temperature
thermistor is short or open circuit.
• Refer to 8-7.the
characteristics of indoor coil
thermistor, and the room
temperature thermistor.
Left lamp flashes.
3-time flash
2.5-second OFF
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 8-6.
A
"Check of
indoor fan motor".
Indoor unit
and outdoor
unit do not
operate.
Indoor unit
and outdoor
unit do not
operate.
3
Left lamp flashes.
4-time flash
2.5-second OFF
Indoor
control
system
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.
8-4. Troubleshooting check table
Not lighted
Blinking
OPERATION INDICATOR
Lighted
· Flashing of OPERATION INDICATOR lamp (left-hand side lamp)
indicates abnormalities.
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.
OB448A-1.qxp 07.5.14 4:21 PM Page 14