Service manual

13
2. Indoor unit failure mode table
NOTE : Blinking patterns of this mode differ from the ones of Troubleshooting check table(9-4.).
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 9-6.A "Check of indoor fan
motor".
Indoor fan motor
The rotational frequency feedback signal is
not emit during the 12-second 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 (Refer to 9-7.).
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 9-6.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 (Refer to 9-7.).
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
OB378C--1.qxp 07.3.30 8:35 AM Page 13