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4. Table of indoor unit failure mode recall function
NOTE
: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
The upper lamp of
OPERATION
INDICATOR lamp
Abnormal point
(Failure mode)
Condition
Remedy
Not lit
Normal
—
—
1-time blink 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 blink
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
thermistor, the sub indoor coil thermistor (10-7.).
3-time blink
2.5-second OFF
Serial signal
The serial signal from outdoor unit is not
received for a maximum of 6 minutes.
Refer to 10-6.
“How to check miswiring and serial
signal error”.
11-time blink
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 blink
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.
5. Table of indoor unit failure mode recall function (When recalled at a set temperature of 23°C)
Table of AIR PURIFYING power failure mode recall function
5-time blink
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board rises above 3V.
4-time blink
AIR PURIFYING
power
When the voltage between CN1T1 (+) and (GND)
on the electronic P.C. board falls significantly.
(0.4V / 0.5ms)
3-time blink
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 blink
Electrode
(Spark discharge)
(
)
Electrode
(
)
Electrode
1-time blink
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.
OBH932
