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Aircon Blinking Lights and their Malfunction Codes

These error codes are provided based on the best of our knowledge, the same set of error codes may differ depending on the different models. We are not liable for any mistakes in the malfunction codes:

When your "timer" light blinks, it is not that your timer is faulty. Most manufacturer uses blinking LED lights to indicate a
faulty air conditioning system.

DAIKIN error codes:  
AO Indoor Error of external protection device
A1 Indoor PCB defect
A3 Indoor Malfunction of drain Level control system
A5 Indoor Freeze-up prevention
A6 Indoor Fan motor lock, Overload
A7 Indoor Malfunction of swing motor flap
A9 Indoor Malfunction of EEV
AF Indoor Drain level above limit (clogging)
AJ Indoor Malfunction of capacity set device
C3 Indoor Malfunction of drain thermistor
C4 Indoor Malfunction of liquid pipe thermistor
C5 Indoor Malfunction of gas pipe thermistor
C7 Indoor Lower louvre limit switch/motor
C9 Indoor Malfunction of air thermistor
CC Indoor Malfunction of moisture sensor
CA Indoor Malfunction of discharge air thermistor
CJ Indoor Malfunction of remote control thermistor
CE Indoor Malfunction of radiant heat sensor
E0 Outdoor Activation of outdoor safety device
E1 Outdoor PCB defect
E3 Outdoor Activation of high pressure switch
E4 Outdoor Activation of low pressure switch
E5 Outdoor Activation of compressor over heat protection
E5 Outdoor Compressor motor lock
E6 Outdoor Compressor start up error
E6 Outdoor Standard compressor lock/overcurrent
E7 Outdoor Fan motor lock, Overload
E8 Outdoor Inverter input overcurrent
E9 Outdoor Malfunction of EEV
EA Outdoor Four way valve defective.
F3 Outdoor Abnormal discharge pipe temperature
F6 Outdoor Refrigerant overcharged
FC Outdoor Low pressure drop.
H3 Outdoor High pressure switch defect
H4 Outdoor Low pressure switch defect
H6 Outdoor Compressor motor position detection sensor error
H7 Outdoor Fan motor position detection sensor error
H8 Outdoor Current transformer error
H9 Outdoor Malfunction of air thermistor
J1 Outdoor Malfunction of pressure sensor
J2 Outdoor Current sensor malfunction
J3 Outdoor Malfunction of discharge pipe thermistor
J4 Outdoor Low pressure saturation thermistor
J5 Outdoor Malfunction of suction pipe thermistor
J6 Outdoor Malfunction of heat exchanger thermistor
J7 Outdoor Malfunction of heat exchanger liquid thermistor
J8 Outdoor Malfunction of liquid pipe thermistor
J9 Outdoor Malfunction of gas pipe thermistor
JA Outdoor Malfunction of discharge pipe pressure sensor
JC Outdoor Malfunction of suction pipe pressure sensor
JH Outdoor Malfunction of oil temperature sensor
L0 Outdoor Malfunction of inverter
L3 Outdoor Electronic component box overheat
L4 Outdoor Inverter cooling defect
L5 Outdoor Comp motor ground fault, Short circuit
L6 Outdoor Compressor motor grounding/short circuit
L7 Outdoor Total input overcurrent
L8 Outdoor Comp overload, Motor disconnected
L9 Outdoor Compressor lock
LA Outdoor Power unit malfunction
LC Outdoor Transmission between inverter & outdoor
P1 Outdoor Inverter over ripple
P3 Outdoor Thermistor abnormality
P4 Outdoor Power unit humidity sensor malfunction
PJ Outdoor Failure of capacity set resistor
U0 System Shortage of refrigerant or EEV failure
U1 System Negative phase, Open phase
U2 System Power supply insufficient
U3 System Wiring check operation not executed
U3 System Mismatch of indoor and outdoor units (Split only)
U4 System Transmission between indoor units
U5 System Transmission to remote controller
U6 System Malfunction transmission outdoor to BP unit
U7 System Transmission between outdoor units
U7 Outdoor Malfunction between outdoor boards(RMX/RX RK)
U8 System Transmission between master & slave R/C
U9 System Transmission error between indoor to outdoor
UA System Excessive number of fancoils
UC System Address duplication of central controllers
UE System Transmission error between indoor & central
UF System Refrigeration system not set/wiring - piping
UH System Terminals 1 and 3 crossed (Split/Skyair)

Daikin remote controller

Instruction to retrieve Daikin error code using
the remote controller:

1) If your DAIKIN remote controller comes with a
"test" button, use it. Otherwise press the
Temperature UP, Temperature DOWN and the
MODE buttons all at the same time.

2) You will see 00 on the remote controller. The
first "0" will be blinking.

Stand facing the particular air conditioner you
wanted to test.

Now press the Temperature UP button, "0" will
become "A" and the air conditioner will respond
with either a single beep or double beep.

Carry on pressing the Temperature UP button
and listen to the beeping sound, stop when you
hear a double beep.
For example: it is now showing "C0".

Now press the MODE button, the second "0" will
be blinking.
Now press the Temperature UP button, "0" will
become "1" and the air conditioner will respond
with either a  double beep or a continuous beep.

The continuous beep is the error code. For
example "C4", it means it is a faulty liquid pipe

Mitsubishi (Mr Slim) error codes:

The Mr. Slim error code is represented by the number of blinks on the LED (light emitting diode).

No of blinks Fault
1 Indoor PCB (printed circuit board)
2 FCU thermistor faulty
3 FCU fan motor error
4 Compressor error (or starter)
5 Condenser thermistor
6 defrost thermistor
7 Condenser PCB error
10 Refrigerant error

Mitsubishi Heavy Industries error codes:

Indoor PCB failure
Duplication of indoor unit address
Indoor / Outdoor Communication error
Indoor Coil Thermistor
Indoor Thermistor (return)
Overload (heating mode) or Coil Thermistor Shorted
Float switch activated
Exceeded number of indoor units per controller (16 max)
More than one unit connected to controller while addressing units
Check adress if still on old 48 or 49 factory setting
master / slave setting or wiring error
Indoor Fan motor
Remote controller sensor error
2 of the 2 phase power supply error
Abnormally low current on L3
E35 /E37
Outdoor Heat exchanger thermistor error
Abnormally high compressor discharge temperature or thermistor error
Outdoor air thermistor
High pressure switch activated
Inverter power transistor overheated
Compressor high current
Exceeded the number of inddor units to outdoor
Indoor / Outdoor transmission error
Address conflict
Inverter over voltage
DC outdoor fan motor error
Low pressure fault
Inverter PCB fault or Power transistor fault
Power transistor Thermistor
Low refrigerant
Compressor startup error
Compressor position detection error
Emergency stop of indoor unit



Samsung error codes:

The Samsung wall mounted air conditioner error code is represented by blinks on the different LEDs (light emitting diode):
*    blinking

FCU Air Thermistor *
FCU coil thermistor  * *
Indoor Fan motor

Indoor EEPROM (or options settings not set)  * *
Outdoor Error *


LG error codes:

LG error code is a 2 digit error code (eg. 48), wired remote controller and some of the wall mounted aircon models provide a display to show this error codes. However, if the aircon/remote controller does not come with any displays, the error code will be a combination of the blinking LED as seen below. An error code of 48 will have the LEFT LED (2nd digit) blinking 8 times and the STAR LED (1st digit) blinking 4 times.

LG aircon malfunction code display LED


Error Code Fault
01 Indoor air thermistor error
02 Indoor coil thermistor error
03 indoor wired remote controller poor communication signal
04 Drain pump / Float switch activated (ceiling cassette unit)
05 Indoor / outdoor communication error
06 Outdoor pipe thermistor error
07 indoor/outdoor Different operation modes
CL Child lock function selected, not an error, press timer and min
button simultaneously for >3sec to toggle.
Po Jet Cool mode selected, not a fault, press Jet cool to toggle
21 IPM fault (compressor over current)
22 CT2 (max current), current exceeded 14A
23 DC link low voltage, voltage less than 140V
24 Low / High pressure switch open
25 Abnormal AC voltage input
26 DC compressor position
28 DC link high voltage
32 Discharge pipe high temperature (inverter)
33 Discharge pipe high temperature (non-inverter)
40 CT circuit malfunction
41 Discharge pipe thermistor error
44 Air thermistor error
45 Condenser thermistor error
46 Suction pipe thermistor error
47 Discharge pipe thermistor error (non-inverter)
48 D-pipe and air sensor dual sensor unplugged
51 Over capacity
52 Communication error (main w sub)
53 Communication error (indoor w outdoor)
54 Outdoor 3-phase power supply error
60 EEPROM check sum mismatch
61 Condenser thermistor high temperature
62 Heat sink thermistor high temperature
63 Condenser thermistor low temperature
65 Heat sink sensor error
67 Outdoor BLDC Fan jammed / lock or fan circuitry problem
105 Communication error (main board w fan board)


Hitachi (Ras-model) error codes:

The ras model error code is represented by the number of blinks on the LED (light emitting diode):

No of Blinks Fault
14 Jammed Fan Motor
15 Indoor Thermistor

Sanyo (inverter, sap kmv series) error codes:

The above model error code is represented by the combination of blinks and lighted LED on the 3 different LED (light
emitting diode), operation, swing and timer.
*    blinking
0   lighted up

FCU Thermistor *
Compressor Thermistor   *
Condenser Thermistor *
FCU coil thermistor     *
Condenser suction pipe thermistor   *
Abnormal current *
FCU miswire 0
High Ampere   0
Wrong Voltage 0
IGBT protection activated (overheating) 0
Outdoor ROM 0
Compressor discharge gas overheat   0
Indoor fan motor 0
4 way valve switching problem 0
Condenser Fan motor *
Compressor 0

Fujitsu error codes (hard wired series)

When EE:EE is displayed, press "energy save" and "zone control" simultaneously for about 3-5 secs.

Or , press "temperature Up" and "temperature down" simultaneously for 3-5 secs.

Otherwise, try 'Master " and "Fan" simultaneously for 3-5 secs.

The lcd display should display the relevant error code.

E0 or 00 Communication error - indoor to remote
E1 or 01 Communication error - indoor to outdoor
E2 or 02 Indoor Air Thermistor Open
E3 or 03 Indoor Air Thermistor Shorted
E4 or 04 Indoor Coil Thermistor Open
E5 or 05 Indoor Coil Thermistor Shorted
E6 or 06 Outdoor Coil Thermistor Open
E7 or 07 Outdoor Coil Thermistor Shorted
E8 or 08 Power source connection failure
E9 or 09 Drain Problem (float switch activated)
EA or 0A Outdoor Air Thermistor Open
EB or 0B Outdoor Air thermistor Shorted
EC or 0C Discharge Thermistor Open
ED or 0D Discharge Thermistor Shorted
EE or 0E High pressure problem
EF or 0F Check refrigerant
11 Outdoor PCB error
12 Indoor fan motor error
13 Outdoor abnormal signal
14 Outdoor EEPROM failure
15 Compressor temperature failure
16 Pressure switch error
17 IPM failure
18 CT error
19 Active filter Module Failure
1A Compressor failure
1B Outdoor fan motor failure
1C Inverter to PCB comms failure
1D 2 way valve sensor error (heat pump series)
1E EEV error
1F Connection indoor unit error

Fujitsu error codes (by reading at flashing LED from outdoor PCB)

Outdoor PCB Fault Codes
Inverter OD Unit PCBs (1 red LED)

OD PCB LED Pulses = 1
Models 9-30 = Comms Failure
Models 36-54 = Comms Failure

OD PCB LED Pulses = 2
Models 9-30 = Disch Sensor Fail
Models 36-54 = Disch Sensor Fail

OD PCB LED Pulses = 3
Models 9-30 = Pipe Sensor Fail
Models 36-54 = Pipe Sensor Fail

OD PCB LED Pulses = 4
Models 9-30 = Air Sensor Fail
Models 36-54 = Air Sensor Fail

OD PCB LED Pulses = 5
Models 9-30 = 2 Way Valve Sensor
Models 36-54 =

OD PCB LED Pulses = 6
Models 9-30 = 3 Way Valve Sensor
Models 36-54 =

OD PCB LED Pulses = 7
Models 9-30 = Compressor Thermistor
Models 36-54 = Compressor Thermistor

OD PCB LED Pulses = 8
Models 9-30 = Pressure Switch
Models 36-54 = Heat Sink Sensor Fail

OD PCB LED Pulses = 9
Models 9-30 = Indoor Comms Error
Models 36-54 = Pressure Switch

OD PCB LED Pulses = 10
Models 9-30 = Current Trip
Models 36-54 =

OD PCB LED Pulses = 11
Models 9-30 = CT Fail
Models 36-54 =

OD PCB LED Pulses = 12
Models 9-30 = Compressor Position Fail
Models 36-54 = IPM Error

OD PCB LED Pulses = 13
Models 9-30 = Compressor Start Fail
Models 36-54 = Compressor Position Fail

OD PCB LED Pulses = 14
Models 9-30 = Timer Failure
Models 36-54 = Compressor Start Fail

OD PCB LED Pulses = 15
Models 9-30 =
Models 36-54 = OD Upper Fan Fail

OD PCB LED Pulses = 16
Models 9-30 =
Models 36-54 = OD Lower Fan Fail

OD PCB LED Pulses = Slow Blink
Models 9-30 =
Models 36-54 = Protect Operation

Non Inverter OD PCBs (2 red LEDs)

LED1 = Blinks
LED2 = Blinks

LED1 = 1 Pulse
LED2 = Lit
Power Source Failure

LED1 = 2 Pulse
LED2 = Lit
OD Disch Temp Sensor

LED1 = 3 Pulse
LED2 = Lit
OD Pipe Sensor

LED1 = 4 Pulse
LED2 = Lit
OD Air Sensor

LED1 = 5 Pulse
LED2 = Lit
Comms Failure

LED1 = 6 Pulse
LED2 = Lit
Indoor Unit Error

LED1 = 7 Pulse
LED2 = Lit
High Discharge Temp

LED1 = 8 Pulse
LED2 = Lit
High Pressure

LED1 = 9 Pulse
LED2 = Lit
Compressor Temp Abnormal

LED1 = 10 Pulse
LED2 = Lit
Compressor Temp Sensor Fail

Inverter Multi AOY30
This has 4 LEDs A,B, C & D to denote which circuit has the fault
Up to 8 flashes - faults are identical to above 9-30 Single System

9 Pressure Switch A
10 Pressure Switch B
11 Indoor Unit Indexing Problem
12 IPM Fail
13 Compressor Position Fail
14 Compressor Fail
15 OD Fan Upper Fail
16 OD Fan Lower Fail
17 PCB Fail

Panasonic (Inverter) error codes:

H00 No Fault Found
H11 Communication error (indoor w outdoor)
H12 Indoor unit capacity mismatch
H14 Indoor air sensor (thermistor) error
H15 Compressor thermistor error
H16 Current Transformer (CT) open circuit
H19 indoor fan motor jammed (locked)
H23 indoor coil thermistor (1) error
H24 indoor coil thermistor (2) error
H25 Indoor e-ion abnormality
H27 outdoor air thermistor error
H28 Condenser coil thermistor error
H30 Compressor thermistor error
H33 Wiring connection error (indoor w outdoor)
H34 Outdoor heat sink temperature abnormality
H36 Outdoor gas pipe thermistor error
H38 Indoor/outdoor mismatch (brand code)
H39 Abnormal indoor operating / standby unit
H41 Abnormal wiring or copper pipe connections
H50 Condenser fan abnormality
H51 Nozzle lock abnormality
H52 Limit switch abnormality
H58 Indoor gas sensor abnormality
H64 Outdoor high pressure sensor abnormality
H97 Condenser fan motor jammed (locked)
H98 Indoor high pressure protection
H99 Indoor anti freeze protection
F11 Cooling / Heating cycle abnormality
F17 Indoor standby unit freezing abnormality
F90 Power factor correction (PFC) circuit protection x 2
F91 Refrigeration cycle abnormality
F93 Compressor rotation failure
F94 Compressor discharge pressure overshoot protection
F95 High pressure protection (cool mode)
F96 IPM (power transistor) overheating protection
F97 Compressor overheating protection
F98 Total running current protection
F99 Outdoor Peak DC (direct current) protection


Panasonic remote controller

Instruction to retrieve Panasonic error code
using the remote controller:

1) Turn off the aircon using the remote

2) Use a sharp object to press the "Check"
button. "00" will first appear.

3) Point the remote controller at the aircon
and press the "timer" up/down buttons to
toggle the error code.

4) once the correct error code is retrieved,
the aircon will beep.

Toshiba Malfunction Codes

Code Malfunction
00 No indoor units connected
0C Faulty indoor air thermistoir
0D Faulty indoor Coil Thermistor
04 Indoor - Outdoor communication error
08 Reverse change temperature
09 Protection device activated, no temperature change detected in fan coil.
0B Float switch activated
12 Indoor microprocessor fault
14, 1C, 1D, 1F Refer to outdoor unit (Super Multi)
15 Refer to Multi Controller
18 Outdoor El Thermistor error
19 Outdoor (liquid/Discharge) Thermistor error
20 Low pressure trip
21 High Pressure trip
97 LAN comm. fault, check indoor PCB
98 Duplicated zone address
99 No communication between inddor unit and its wired remote controller
1E High Compressor discharge temperature
B5 External input display fault or high level refrigerant leak if RD1 is fitted.
B6 External interlock display fault or high level refrigerant leak if RD1 is fitted.
B7 Faulty slave unit (Group)
FF No Fault

TECO Fault Codes:

When a TECO air conditioner is faulty, the operation light will be flashing. The combination of the DEFROST, TIMER and AUTO will indicate
the type of malfunction. Please note that we've added our own interpretation on the last column.

Type of Fault Our Interpretation

Module Protection  

Compressor top protection against
Compressor overheating or faulty discharge


Outdoor ambient sensor abnormal Condenser air thermistor faulty

Too low or high voltage supply Voltage supply error, check supply voltage
Indoor ambient sensor abnormal Indoor air thermistor faulty
Fan speed beyond control Faulty fan motor

zero crossing examination error  

Temperature fuse protection or Indoor / outdoor do not match Condenser overheating, check fan speed and condenser heat exchanger or non matching indoor outdoor unit (check model and type)

EEPROM data Error EEPROM error
Indoor outdoor communication fault Indoor / Outdoor PCB or cabling faulty

Indoor outdoor communication fault Indoor / Outdoor PCB

Midea Indoor Malfuction Codes (MSE /MSX/MSK Series)

E0 EEPROM parameter error
E1 Communication error - indoor to outdoor
E2 Zero-crossing signal error
E3 Fan speed out of control
E5 Outdoor temperature Thermistor error
E6 Indoor room/Coil Thermistor error
P0 IGBT over -strong current protection
P1 Over or low voltage protection
P2 Temperature protection of compressor top
P4 Inverter Compressor drive error

Midea Outdoor Malfuction Codes ( 21K-24KBTU MSK Series)

1 Communication error - indoor to outdoor
2 Phase sequence error
3 Pressure protection
4 T3 Error
5 Indoor T1/T2 Error
6 Normal