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Since the indications cover various units, the corresponding parts listed below may not be present in some models.
(1) OPERATION lamp
(2) TIMER lamp
(3) LED CLEAN lamp
OPERATION TIMER
LED CLEAN
ON/OFF
INDOOR UNIT
(1) Self-diagnostics Lamps
....
OFF
....
Blinking
....
ON (Illuminated)
LED Clean
(3)
Operation
(1)
Timer
(2)
Indication on indoor unit
(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location
(short-circuit detection only for the humidity sensor)
(3) Indoor/outdoor PCboard failure
(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location
(3) Outdoor PCboard failure
Outdoor PCboard failure
(1) Mis-wiring (2) AC power failure (3) Blown fuse (4) Power Relay failure
(5) Indoor or outdoor PCboard failure (6) Outdoor Fan Motor failure (7) Reactor failure
(8) High-Pressure Switch failure (9) Overload Relay failure (10) Magnetic Coil failure
* See detailed flowchart in this section.
(1) HIC or power Tr failure (2) Outdoor fan does not turn. (3) Instantaneous power outage
(4) Service valve not opened. (5) Outdoor fan blocked. (6) Continuous overload operation
(7) Compressor failure (8) Outdoor PCboard failure
(1) External ROM data failure (2) Outdoor PCboard failure
(1) Instantaneous power outage (2) HIC or power transistor failure
(3) Outdoor PCboard failure
(1) Outdoor PCboard failure (2) Outdoor power supply voltage failure
(1) Electric expansion valve failure (2) Capillaries choked (3) Shortage of refrigerant
(4) Continuous overload operation (5) Outdoor fan does not rotate (6) Outdoor
PCboard
failure
(1) Fan motor failure (2) Contact failure at connector (3) Indoor PCboard failure
(1) 4-way valve failure (heat pump model only)
(2) Outdoor PCboard failure
(1) Service valve not opened. (2) Shortage of refrigerant
(1) Open phase (2) Outdoor PCboard failure
(1) Fan motor failure (2) Contact failure at connector (3) Outdoor PCboard failure
(1) Mis-wiring (2) Blown fuse (3) Power Relay failure (4) Outdoor PCboard failure
(5) Compressor failure
* See detailed flowchart in this section.
(1) Indoor fan system failure (2) Shortage of refrigerant (3) Low-temperature operation
S01
S02
S03
S04
S05
S06
S07
E01
E02
E03
E04
E05
E06
E07
E08
E09
E10
E11
E12
E13
F10
F02
F13
F04/F12
F09/
F15 to F18
F08/
F21 to F24
F27
E05
P26
F31
P16
P07
P03
P01
P19
P15
P29
P22
E07/P04/P05
P20/P27
P11
Diagnosis Contents
Error
Code
Alarm
Code
Possible Malfunction
Room temperature sensor failure
Indoor heat exchanger sensor failure
Humidity sensor failure
Compressor temperature sensor failure
Outdoor heat exchanger sensor failure
Outdoor air temperature sensor failure
Outdoor electrical current detection
failure
Indoor/outdoor communications failure
(serial communications)
• HIC circuit failure
• Power Tr (transistor) circuit failure
• PAM circuit failure
• Active circuit failure
• 4-way valve switching failure
• Indoor zero-cross failure
• Outdoor system communications failure
• OLR operation
• Outdoor power supply open phase
• Outdoor coil freezing
Outdoor unit external ROM (OTP data)
failure
Peak current cut-off
Compressor discharge overheat
prevention activated.
No-refrigerant protection
DC compressor drive circuit failure
Outdoor fan operating failure
Freeze-prevention operation activated.
Indoor fan operating failure
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