Service manual

14
8-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
No.
Abnormal
point
Operation indicator lamp Symptom Condition Correspondence
1
Indoor coil
thermistor
Left lamp fl ashes.
2-time fl ash
2.5-second OFF
Indoor unit and
outdoor unit do
not operate.
The indoor coil or the room temperature ther-
mistor is short or open circuit.
Refer to the characteristics of
indoor coil thermistor, and the
room temperature thermistor
(8-7).
•
Room tem-
perature
thermistor
2
Indoor fan
motor
Left lamp fl ashes.
3-time fl ash
2.5-second OFF
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
Refer to 8-6. "Check of in-
door fan motor".
•
3
Indoor con-
trol system
Left lamp fl ashes.
4-time fl ash
2.5-second OFF
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.
•