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2. Indoor unit failure mode table
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table (8-4.).
12-time flash
2.5-second OFF
Replace the indoor electronic control
P.C. board.
Indoor control system
It cannot properly read data in the
nonvolatile memory of the indoor electronic
control P.C. board.
11-time flash
2.5-second OFF
Refer to 8-6.A "Check of indoor fan
motor".
Indoor fan motor
The rotational frequency feedback
signal is not emit during the 12 seconds the
indoor fan operation.
2-time flash
2.5-second OFF
Refer to the characteristics of the main
indoor coil thermistor, the sub indoor coil
thermistor (8-7.).
Indoor coil thermistor
The indoor coil thermistor short or open
circuit is detected every 8 seconds during
operation.
3-time flash
2.5-second OFF
Refer to 8-6.D "How to check mis-wiring
and serial signal error".
Serial signal
The serial signal from outdoor unit is
not received for a maximum of 6 minutes.
1-time flash
every 0.5-second
Refer to the characteristics of the room
temperature thermistor (8-7.).
Room temperature
thermistor
The room temperature thermistor short
or open circuit is detected every 8
seconds during operation.
Not lighted –Normal –
Left lamp of OPERATION
INDICATOR lamp
Correspondence
Abnormal point
(Failure mode)
Condition
OB450B-1.qxp 07.5.14 4:13 PM Page 14