Samsung air conditioners error codes

The modern Samsung air conditioners have a very developed self-diagnostics system, and when the control system detects an error, it blocks the operation of the entire device and displays a cause of faulty condition.

The control system of the SAMSUNG air conditioners reports that an error occurred by blinking of a light-emitting diode on the surface of the internal (or external) unit. When a particular error of an air conditioner is detected, light-emitting diodes blink in a certain order, which corresponds with a particular error. If the control system of an air conditioner detects more than one error, the error with the highest priority is displayed first and then all the following errors are displayed.

Samsung error codes Outdoor Unit

SUB PCB
7-Segment
Diplay
ContentMeasuresNumber of TimesOutdoor unit
compressor/
outdoor unit fan
E 101Indoor unit communication
error(1min.)
• Check the communication line for indoor units
• Check the power supply of the communication
phase(DC)
1 TimeOperation-off
E 102Communication time-out
error(2min.)
• Check the communication line for indoor units
• Check the power supply of the communication
phase(DC)
1 TimeOperation-off
E 121Indoor temperature sensor• Check the temp. sensor of the indoor unit room
• Check the indoor PCB connector
1 TimeOperation-off
E 122Indoor unit EVA IN sensor• Check the indoor unit drainage pipe sensor
• Check the indoor PCB connector
1 TimeOperation-off
E 123Indoor unit EVA OUT sensor• Check the indoor unit drainage pipe sensor
• Check the indoor PCB connector
1 TimeOperation-off
E 128Dismount of indoor unit
EVA IN sensor
• Check the drainage pipe has been dismounted1 TimeOperation-off
E 129Dismount of indoor unit
EVA OUT sensor
• Check the drainage pipe has been dismounted1 TimeOperation-off
E 153Secondary detection of indoor
floating switch
• Check the indoor unit's float sensor
• Check the indoor PCB connector
1 TimeOperation-off
E 154Indoor fan error• Check the indoor PCB connector1 TimeOperation-off
E 162Indoor eeprom error• Check the EEPROM data
• Check the indoor's option
1 TimeOperation-off
E 163Indoor eeprom option error• Check the EEPROM data
• Check the indoor's option
1 TimeOperation-off
E 201Indoor unit not connected• Check the indoor unit connection
• Check the indoor unit number(multi only)
1 TimeOperation-off
E 2021min. Time out Comm.
(Display Board : Onboard :
Indoor ↔ Outdoor)
• Check the indoor unit connection
• Check the indoor unit option
1 TimeOperation-off
E 203Abnormal Serial
communication(Display Board:
Indoor ↔ Outdoor)
---
E 221Outdoor temp sensor error
(Dual/Single)
• Check the connection status of the sensor
• Check the sensor location
• Check the risistance values of sensor
1 TimeOperation-off
E 237Cond temp sensor error
(Dual/Single)
• Check the connection status of the sensor
• Check the sensor location
• Check the risistance values of sensor
1 TimeOperation-off
E 251Discharge temp sensor error
(Dual/Single)
• Check the connection status of the sensor
• Check the sensor location
• Check the risistance values of sensor
1 TimeOperation-off
E 416Discharge over temperature
(Dual/Single)
-3 TimesOperation-off
E 440Operation condition
secession(HEATING)
• Check the operation status of operation mode
• Check the temp. sensor
1 TimeOperation-off
E 441Operation condition
secession(COOLING)
• Check the operation status of operation mode
• Check the temp. sensor
1 TimeOperation-off
E 458Fan error• Check the input power connection status
• Check the connection status between the motor
and PCB in outdoor unit
• Check the fuse of indoor/outdoor units
1 TimeOperation-off
E 461Comp Starting error• Check the connection status of the compressor
• Check the resistand between different phases in
compressor
5 TimeOperation-off
E 462I_Trip error / PFC Over current• Check the input power
• Check the refrigerant is filled
• Check the outdoor fan operation normally
3 TimeOperation-off
E 464IPM Over Current(O.C)• Check the refrigerant is filled
• Check the connection status of compressor and if it
operates normally
• Check for any obstacles around indoor/outdoor
units
9 TimeOperation-off
E 465Comp Vlimit error• Check the connection status of compressor
• Check the resistance between different phases in
compressor
9 TimesOperation-off
E 466DC-Link voltage under/
over error
• Check the connection of input power-Restart(after 3min.)
E 467Comp rotation error• Check the connection status of the compressor
• Check the resistance between different phases in
compressor
3 TimesOperation-off
E 468Current sensor error• Check the PCB operates normally1 TimesOperation-off
E 469DC-Link valtage sensor error• Check the connection of input power1 TimesOperation-off
E 471OTP error• Check the PCB operates normally1 TimesOperation-off
E 472AC Line Zero Cross Signal out• Check the connection of input power1 TimesOperation-off
E 473Comp Lock error• Check the connection status of the compressor
• Check the resistance between different phases in
compressor
3 TimesOperation-off
E 475Fan error(two fan outdoor• Check the input power connection status
• Check the connection status between the motor
and PCB in outdoor unit
• Check the fuse of indoor/outdoor units
1 TimesOperation-off
E 554GAS Leak error(Dual/Single)• Check refrigerant is filled
• Check the indoor EVA sensor
3 TimesOperation-off
E 556Capacity miss match• Check the indoor unit's option code
• Check the capacity of indoor unit's and outdoor
unit's
1 TimesOperation-off

Wired remote controller(Option resource)
– If an error occurs is displayed on the wired remote controller.
– To see an error code, please press the test button.

Error modeContent MeasuresProduct operation
status in case of error
Outdoor unit compressor/
outdoor unit fan
Error type
101Indoor unit communication errorCheck the communication line for indoor
units, check the power supply of the
communication phase (DC)
Operation-offCommunication
error
102Communication time-out error
between indoor/outdoor unit
6-packet over error
Check the communication line for indoor
units, check the power supply of the
communication phase (DC)
Operation-offCommunication
error
121Indoor temperature sensor
(open/short error)
Check the temp. sensor of the indoor unit
room. Check the indoor PCB connector
CN21(white)
Operation-offIndoor sensor
error
122Indoor unit Eva In sensor
(open/short)
Check the indoor unit drainage pipe sensor
Check the indoor PCB connector CN21
(white)
Operation-offIndoor sensor
error
128Dismount of indoor unit Eva In
sensor
Check the drainage pipe has been
dismounted
Operation-offIndoor sensor
error
153Secondary detection of indoor
floating switch
Check the indoor unit’s float sensor
Check the indoor PCB connector CN51
(black)
Operation-offSelf-diagnosis
error
201Indoor unit not connectedCheck the indoor unit connection
Check the indoor unit option
Operation-offCommunication
error
203Communication error between
indoor/outdoor unit INV and Main
Micom (1 min.)
Check the Main MICOM
Check the inverter MICOM
-Communication
error
221Outdoor temperature sensor errorCheck the connection status of the sensor
Check the sensor location
Check the resistance values of sensor
Operation-offOutdoor sensor
error
237Cond. temperature sensor errorCheck the connection status of the sensor
Check the sensor location
Check the resistance values of sensor
Operation-offOutdoor sensor
error
251[inverter] Emission temperature
sensor error
Check the connection status of the sensor
Check the sensor location
Check the resistance values of sensor
Operation-offOutdoor sensor
error
416Excessive temperature emissionNot an error (discharge temp. control)-Outdoor unit
protection control
error
425Power cable connection errorCheck the status of power connection Operation-offOutdoor sensor
error
450Non-connection error of indoor
and outdoor Communication wire
(connected to the power terminal)
Check the status of power connection
Check the connection status of the
communication line
Operation-offSelf-diagnosis
error
458Outdoor fan 1 errorCheck the input power connection status
Check the connection status between the
motor and PCB in outdoor unit
Check the fuse of indoor/outdoor units
Operation-offSelf-diagnosis
error
461[inverter] Compressor operation
error
Check the connection status of the compressor
Check the resistance between different
phases in compressor
Operation-offOutdoor unit
protection control
error
462Discharge current error/
PFC over-current error
Check the input power
Check refrigerant is filled
Check outdoor fan operates normally
Operation-offOutdoor unit
protection control
error
464[inverter] IPM over current errorCheck refrigerant is filled
Check the connection status of compressor
and if it operates normally
Check for any obstacles around indoor/
outdoor units
Operation-offOutdoor unit
protection control
error
467[inverter] Compressor rotation
error
Check the connection status of the
compressor
Check the resistance between different
phases in compressor
Operation-offOutdoor unit
protection control
error
468[inverter] Current sensor errorCheck PCB operates normallyOperation-offOutdoor unit
protection control
error
469[inverter] DC link voltage sensor
error
Check the connection of input power
Check the status of RY21 and R2000 of
Inverter PCB
Operation-offOutdoor unit
protection control
error
416[inverter] OTP errorCheck PCB operates normallyOperation-offOutdoor unit
protection control
error
475Outdoor fan 2 errorCheck the connection status of input power
Check the connection status of motor and
outdoor PCB
Check the fuse of indoor/outdoor unit
Operation-offSelf-diagnosis
error
554Gas leakage errorCheck refrigerant is filled
Check the indoor EVA sensor
Operation-offSelf-diagnosis
error
556Inconsistent volume Check the indoor unit’s option codeOperation-offOutdoor unit
protection control
error
601Communication error between
indoor unit and wired remote
controller
Check the connection wire linking indoor
unit and wired remote controller
Normal operationWired remote
controller control
error
602Communication error between
master and slave wired remote
controller
Check the option switch that distinguishes
master and slave (Available only for 1
master unit and 1 slave unit)
Normal operationWired remote
controller control
error
606Cross installation error of COM1/
COM2
Check the connection of outdoor unit and
wired remote controller is linked to Com2
terminal of the indoor unit
Normal operationWired remote
controller control
error
EAWired remote controller COM2
setting option error
Check the Dip switch for Com1 and Com2
is set to Com2
Normal operationWired remote
controller control
error