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4. Indoor unit failure mode table
POWER lamp
Abnormal point
(Failure mode)
Condition Remedy
Not lighted
Normal
—
—
1-time fl 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 fl 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 main indoor coil ther-
mistor, the sub indoor coil thermistor (10-7.).
3-time fl ash
2.5-second OFF
Serial signal
The serial signal from outdoor unit is not re-
ceived for a maximum of 6 minutes.
Refer to 10-6. "How to check miswiring and serial
signal error".
11-time fl 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 fl 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.
NOTE
: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
5. AIR PURIFYING power failure mode table
5-time flash
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board rises above 3V.
4-time flash
AIR PURIFYING
power
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board falls significantly.
(0.4V / 0.5ms)
3-time flash
Refer to 10-6. "Check of AIR PURIFYING power".
Abnormal electric
discharge error 1
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board falls by 1.2V below
the normal voltage value (2.5V).
2-time flash
Electrode
(Spark discharge)
(
)
Electrode
(
)
Electrode
1-time flash
AIR PURIFYING
power control
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board falls below 1.3V
(spark discharge judgment voltage).
When AIR PURIFYING power cannot be turned OFF
even if the AIR PURIFYING operation is turned OFF
with the remote controller.
POWER lamp
Remedy
Abnormal point
(Failure mode)
Condition
Abnormal electric
discharge error 2
NOTE1
: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
NOTE2
: As soon as an abnormality is detected, AIR PURIFYING power goes OFF, therefore measuring instrument which
records the voltage wave is required in order to perform the above mentioned voltage measurement.
6. Operation check on i-see SENSOR
While recalling the failure details, set the temperature to 19°C to perform the simple check on the i-see SENSOR.
Place your hand over the i-see SENSOR, and the buzzer will beep at 1 second intervals. (Normal detection temperature
range is 34 to 39°C.)
If the buzzer does not beep, check for disconnection of the connectors.
Set the temperature to 23°C to exit the simple check mode on the i-see SENSOR.
POWER lamp
Abnormal point
(Failure mode)
Condition Remedy
6-time fl ash
i-see SENSOR
Poor contact in i-see SENSOR wiring
Failure in loading corrected data of i-see
SENSOR
Check for disconnection of the connectors.
OBH623D
