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)
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
thermistor.
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:
Code
E1
Indoor PCB failure
E2
Duplication of indoor unit address
E5
Indoor / Outdoor Communication error
E6
Indoor Coil Thermistor
E7
Indoor Thermistor (return)
E8
Overload (heating mode) or Coil Thermistor Shorted
E9
Float switch activated
E10
Exceeded number of indoor units per controller (16 max)
E11
More than one unit connected to controller while addressing units
E12
Check adress if still on old 48 or 49 factory setting
E14
master / slave setting or wiring error
E16
Indoor Fan motor
E28
Remote controller sensor error
E32
2 of the 2 phase power supply error
E34
Abnormally low current on L3
E35 /E37
Outdoor Heat exchanger thermistor error
E36/39
Abnormally high compressor discharge temperature or thermistor error
E38
Outdoor air thermistor
E40
High pressure switch activated
E41
Inverter power transistor overheated
E42
Compressor high current
E43
Exceeded the number of inddor units to outdoor
E45
Indoor / Outdoor transmission error
E46
Address conflict
E47
Inverter over voltage
E48
DC outdoor fan motor error
E49
Low pressure fault
E51
Inverter PCB fault or Power transistor fault
E56
Power transistor Thermistor
E57
Low refrigerant
E59
Compressor startup error
E60
Compressor position detection error
E63
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
Fault
Operation
Timer
Turbo
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 Code
Fault
01
Indoor air thermistor error
02
Indoor coil thermistor error
03
indoor wired remote controller poor communication signal
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
Fault
Operation
Swing
Timer
FCU Thermistor
*
Compressor Thermistor
*
Condenser Thermistor
*
*
FCU coil thermistor
*
Condenser suction pipe thermistor
*
*
Abnormal current
*
*
*
FCU miswire
0
High Ampere
0
Wrong Voltage
0
0
IGBT protection activated (overheating)
0
0
Outdoor ROM
0
0
Compressor discharge gas overheat
0
0
Indoor fan motor
0
0
0
4 way valve switching problem
0
*
*
Condenser Fan motor
*
0
*
Compressor
0
*
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.
Code
Fault
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
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:
Malfunction
Code
Fault
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
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
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.
Defrost
Timer
Auto
Type of Fault
Our Interpretation
*
Module Protection
*
Compressor top protection against
temperature
Compressor overheating or faulty discharge
thermistor
*
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
*
*
Flash
Fan speed beyond control
Faulty fan motor
Flash
zero crossing examination error
Flash
*
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)