If there is no trouble, the lamps neither blink nor illuminate.
Since the indications cover various units, the corresponding items listed below may not be present in some models.
If the operation lamp (orange) continues to blink immediately after when the power source has been supplied
to the air conditioner, there might be trouble with the external ROM (E14) in the indoor unit.
Indication on indoor unit
....
OFF
TimerLED Clean Operation
( 3 ) ( 2 ) ( 1 )
Code Diagnostics item Diagnostics contents
S01
Room temperature sensor failure
Sensor open circuit or short circuit
Contact failure at connector or open circuit at terminal crimping location (short-circuit
detection only for the humidity sensor)
(1)
(2)
External ROM data failure External ROM installation failure
PAM circuit abnormal voltage Protection for current
4-way valve failure (heat pump model only)
Indoor heat exchanger temperature sensor disconnected.
Service valve not opened. Shortage of refrigerant
Open phase Outdoor circuit board failure
Miswiring AC power failure (2) Blown fuse (3) Power relay failure (4)
Indoor or outdoor circuit board failure
(1)
(5)
Electric expansion valve failure Capillaries choked Shortage of refrigerant
Miswiring in inter-unit Outdoor circuit board failure
Operating current is 20 A or higher.
(1) (2)
(1) (2)
(1) (2) (3)
(1)
Contact failure at connector Outdoor circuit board failure
Indoor fan system failure Shortage of refrigerant Low-temperature operation
(1) (2)
(1) (2)
(1) (2)
(1) (2)
(1) (2) (3)
Locked fan motor Contact failure at connector
Noise, instantaneous power blackout, or power waveform error due to lightning or other factor
(1)
(2)
(1) (2)
(3)
HIC or power Tr failure Outdoor fan does not turn. Instantaneous power outage
Service valve not opened. Outdoor fan blocked. Continuous overload operation
Compressor failure Outdoor circuit board failure
(1) (2) (3)
(4) (5) (6)
(7) (8)
Indoor heat exchanger sensor failure
Humidity sensor failure
Compressor temperature sensor failure
SH(Suction) sensor failure
Outdoor heat exchanger sensor failure
Outdoor air temperature sensor failure
Indoor/outdoor communications failure
(serial communications)
Outdoor unit external ROM failure
Peak current cut-off
HIC circuit failure
PAM circuit failure
Outdoor system communications failure
Compressor discharge overheat
prevention activated.
Indoor fan operating failure
No-refrigerant protection
DC compressor drive circuit failure
Outdoor fan operating failure
Freeze-prevention operation activated.
4-way valve switching failure
Indoor zero-cross failure
Electrical current detection failure
Operating frequency is 45 Hz or higher and less than 0.5 A of current is flowing.(1)
S02
S03
S04
S05
S06
S07
E01
E02
E03
E04
E05
E06
E07
E08
E09
E10
E11
E12
E13
....
Blinking
....
Illuminated
NOTE
(1) Self-diagnostics Lamps
REMOTE CONTROL
receiver
(1) OPERATION lamp
(2) TIMER lamp
(3) LED CLEAN lamp
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