23
2. Indoor unit failure mode table
Upper lamp of OP-
ERATION INDICA-
TOR lamp
Abnormal point
(Failure mode)
Condition
Remedy
Not lighted
Normal
—
—
1-time f ash every
0.5-second
Room temperature
thermistor
The room temperature thermistor short or
open circuit is detected every 8 seconds dur-
ing operation.
Refer to the characteristics of the room temperature
thermistor (10-7.).
2-time f ash
2.5-second OFF
Indoor coil
thermistor
The indoor coil thermistor short or open circuit
is detected every 8 seconds during operation.
Refer to the characteristics of the indoor coil thermistor
(10-7.).
11-time f ash
2.5-second OFF
Indoor fan motor
The rotational frequency feedback signal is
not emitted for 12 seconds after the indoor fan
motor is operated.
Refer to 10-6. "Check of indoor fan motor".
12-time f ash
2.5-second OFF
Indoor control
system
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.
14-time f ash 1
2.5-second OFF
Refrigerant
circuit
Refer to 10-4. No.4 "Condition".
Refer to 10-4. No.4 "Remedy".
NOTE
: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
ON
OFF
Beeps
Beeps
Repeated cycle
2.5-second
OFF
3.0-second
ON
14-time
flash
Repeated cycle
2.5-second
OFF
3.0-second
ON
14-time
flash
1. A blinking pattern when "14-time flash" is displayed :
OBH621A
