Aircon blinking & malfunction code (click to read more)

These error codes are provided based on the best of our knowledge, the same set of error codes may differ depending on different models. Check with your aircon manufacturer when in doubt:

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

Video instructions 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 
thermistor.

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/over-current
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 error between indoor and outdoor PCB 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)

Mitsubishi (Mr Slim), non inverter error codes:

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

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

Mitsubishi (Starmex), Inverter error codes:

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

No of blinksFault
1Transmission error between inddor and outdoor board
2FCU thermistor faulty
3FCU fan motor error
4Indoor pcb fault
5Outdoor Power system fault (compressor or Inverter board)
6Outdoor thermistor
7Outdoor PCB error
14Refer to SERVICE MANUAL

Mitsubishi(Mr Slim), non inverter error codes:

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

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

Mitsubishi (Starmex), Inverter error codes:

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

No of blinksFault
1Transmission error between inddor and outdoor board
2FCU thermistor faulty
3FCU fan motor error
4Indoor pcb fault
5Outdoor Power system fault (compressor or Inverter board)
6Outdoor thermistor
7Outdoor PCB error
14Refer to SERVICE MANUAL

Samsung error codes:

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

FaultOperationTimerTurbo
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.

Error CodeFault
01Indoor air thermistor error
02Indoor coil thermistor error
03indoor wired remote controller poor communication signal
04Drain pump / Float switch activated (ceiling cassette unit)
05Indoor / outdoor communication error
06Outdoor pipe thermistor error
07indoor/outdoor Different operation modes
CLChild lock function selected, not an error, press timer and min 
button simultaneously for >3sec to toggle.
PoJet Cool mode selected, not a fault, press Jet cool to toggle
21IPM fault (compressor over current)
22CT2 (max current), current exceeded 14A
23DC link low voltage, voltage less than 140V
24Low / High pressure switch open
25Abnormal AC voltage input
26DC compressor position
28DC link high voltage
32Discharge pipe high temperature (inverter)
33Discharge pipe high temperature (non-inverter)
40CT circuit malfunction
41Discharge pipe thermistor error
44Air thermistor error
45Condenser thermistor error
46Suction pipe thermistor error
47Discharge pipe thermistor error (non-inverter)
48D-pipe and air sensor dual sensor unplugged
51Over capacity
52Communication error (main w sub)
53Communication error (indoor w outdoor)
54Outdoor 3-phase power supply error
60EEPROM check sum mismatch
61Condenser thermistor high temperature
62Heat sink thermistor high temperature
63Condenser thermistor low temperature
65Heat sink sensor error
67Outdoor BLDC Fan jammed / lock or fan circuitry problem
105Communication 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 BlinksFault
14Jammed Fan Motor
15Indoor 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

FaultOperationSwingTimer
FCU Thermistor*  
Compressor Thermistor * 
Condenser Thermistor** 
FCU coil thermistor  *
Condenser suction pipe thermistor **
Abnormal current***
FCU miswire0  
High Ampere 0 
Wrong Voltage00 
IGBT protection activated (overheating)0 0
Outdoor ROM00 
Compressor discharge gas overheat 00
Indoor fan motor000
4 way valve switching problem0**
Condenser Fan motor*0*
Compressor0*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.

CodeFault
E0 or 00Communication error – indoor to remote
E1 or 01Communication error – indoor to outdoor
E2 or 02Indoor Air Thermistor Open
E3 or 03Indoor Air Thermistor Shorted
E4 or 04Indoor Coil Thermistor Open
E5 or 05Indoor Coil Thermistor Shorted
E6 or 06Outdoor Coil Thermistor Open
E7 or 07Outdoor Coil Thermistor Shorted
E8 or 08Power source connection failure
E9 or 09Drain Problem (float switch activated)
EA or 0AOutdoor Air Thermistor Open
EB or 0BOutdoor Air thermistor Shorted
EC or 0CDischarge Thermistor Open
ED or 0DDischarge Thermistor Shorted
EE or 0EHigh pressure problem
EF or 0FCheck refrigerant
11Outdoor PCB error
12Indoor fan motor error
13Outdoor abnormal signal
14Outdoor EEPROM failure
15Compressor temperature failure
16Pressure switch error
17IPM failure
18CT error
19Active filter Module Failure
1ACompressor failure
1BOutdoor fan motor failure
1CInverter to PCB comms failure
1D2 way valve sensor error (heat pump series)
1EEEV error
1FConnection 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
OD PCB Fail

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

Malfunction 
Code
Fault
H00No Fault Found
H11Communication error (indoor w outdoor)
H12Indoor unit capacity mismatch
H14Indoor air sensor (thermistor) error
H15Compressor thermistor error
H16Current Transformer (CT) open circuit
H19indoor fan motor jammed (locked)
H23indoor coil thermistor (1) error
H24indoor coil thermistor (2) error
H25Indoor e-ion abnormality
H27outdoor air thermistor error
H28Condenser coil thermistor error
H30Compressor thermistor error
H33Wiring connection error (indoor w outdoor)
H34Outdoor heat sink temperature abnormality
H36Outdoor gas pipe thermistor error
H38Indoor/outdoor mismatch (brand code)
H39Abnormal indoor operating / standby unit
H41Abnormal wiring or copper pipe connections
H50Condenser fan abnormality
H51Nozzle lock abnormality
H52Limit switch abnormality
H58Indoor gas sensor abnormality
H64Outdoor high pressure sensor abnormality
H97Condenser fan motor jammed (locked)
H98Indoor high pressure protection
H99Indoor anti freeze protection
F11Cooling / Heating cycle abnormality
F17Indoor standby unit freezing abnormality
F90Power factor correction (PFC) circuit protection x 2
F91Refrigeration cycle abnormality
F93Compressor rotation failure
F94Compressor discharge pressure overshoot protection
F95High pressure protection (cool mode)
F96IPM (power transistor) overheating protection
F97Compressor overheating protection
F98Total running current protection
F99Outdoor 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 
controller.

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

CodeMalfunction
00No indoor units connected
0CFaulty indoor air thermistoir
0DFaulty indoor Coil Thermistor
04Indoor – Outdoor communication error
08Reverse change temperature
09Protection device activated, no temperature change detected in fan coil.
0BFloat switch activated
12Indoor microprocessor fault
14, 1C, 1D, 1FRefer to outdoor unit (Super Multi)
15Refer to Multi Controller
18Outdoor El Thermistor error
19Outdoor (liquid/Discharge) Thermistor error
20Low pressure trip
21High Pressure trip
97LAN comm. fault, check indoor PCB
98Duplicated zone address
99No communication between inddor unit and its wired remote controller
1EHigh Compressor discharge temperature
B5External input display fault or high level refrigerant leak if RD1 is fitted.
B6External interlock display fault or high level refrigerant leak if RD1 is fitted.
B7Faulty slave unit (Group)
FFNo 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.

DefrostTimerAutoType of FaultOur Interpretation
*Module Protection 
*Compressor top protection against 
temperature
Compressor overheating or faulty discharge 
thermistor
*Outdoor ambient sensor abnormalCondenser air thermistor faulty
**Too low or high voltage supplyVoltage supply error, check supply voltage
***Indoor ambient sensor abnormalIndoor air thermistor faulty
**FlashFan speed beyond controlFaulty fan motor
Flashzero crossing examination error 
Flash*Temperature fuse protection or Indoor / outdoor do not matchCondenser overheating, check fan speed and condenser heat exchanger or non matching indoor outdoor unit (check model and type)
FlashEEPROM data ErrorEEPROM error
FlashFlashFlashIndoor outdoor communication faultIndoor / Outdoor PCB or cabling faulty
**Indoor outdoor communication faultIndoor / Outdoor PCB

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

CodeFault
E0EEPROM parameter error
E1Communication error – indoor to outdoor
E2Zero-crossing signal error
E3Fan speed out of control
E5Outdoor temperature Thermistor error
E6Indoor room/Coil Thermistor error
P0IGBT over -strong current protection
P1Over or low voltage protection
P2Temperature protection of compressor top
P4Inverter Compressor drive error

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

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

Leave a Reply

Your email address will not be published. Required fields are marked *

sixteen + 14 =