Samsung Aircon Error Codes

Reference table for common Samsung codes. Use it to understand likely meaning, typical causes, and context before booking.

Before you use this tool

This is a guidance table, not a model-exact diagnosis. The same code can differ by series, controller, and model year. Use this page to narrow next steps, then verify with model sticker details.

Safety warning

Stop using the unit and contact a technician if the breaker trips repeatedly, you smell burning, see sparks, hear loud electrical buzzing, or water is leaking from places it normally should not.

Samsung code table

Includes common SG residential split-system codes with likely meaning and typical causes.

CFGeneral

Filter cleaning reminder

Typical causes

Maintenance/status logic from controller
Temporary operating state during protection or cleaning

CHSystem

Mode change/mismatch error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

CIGeneral

Auto-cleaning status code

Typical causes

Maintenance/status logic from controller
Temporary operating state during protection or cleaning

DFGeneral

Auto-defrost in progress

Typical causes

Maintenance/status logic from controller
Temporary operating state during protection or cleaning

E1Indoor

Indoor fan motor abnormal

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E5Communication

Indoor-outdoor communication abnormal

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E6Sensor

Indoor heat exchanger temperature sensor abnormal

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E7Sensor

Outdoor heat exchanger temperature sensor abnormal

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E9Outdoor

Outdoor unit abnormality (model-dependent)

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

E101Communication

Indoor unit communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E102Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E103Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E105Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E106Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E108Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E109Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E121Sensor

Indoor room temperature sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E122Sensor

Indoor heat exchanger sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E123Sensor

Indoor heat exchanger sensor 2 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E124Sensor

Indoor heat exchanger sensor 3 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E125Sensor

Indoor heat exchanger sensor 4 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E126Sensor

Indoor heat exchanger sensor 5 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E127Sensor

Indoor heat exchanger sensor 6 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E128Sensor

Indoor heat exchanger sensor 7 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E129Sensor

Indoor heat exchanger sensor 8 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E130Sensor

Indoor heat exchanger sensor 9 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E131Sensor

Indoor heat exchanger sensor 10 open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E134Indoor

Indoor fan motor error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E135Indoor

Indoor fan motor feedback error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E136Indoor

Indoor fan motor 2 error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E137Indoor

Indoor fan motor 2 feedback error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E138Indoor

Indoor fan motor 3 error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E139Indoor

Indoor fan motor 3 feedback error

Typical causes

Indoor fan motor lock, wear, or winding fault
Indoor PCB fan-drive or control output fault
Loose indoor motor harness or connector contact
Severe airflow restriction from dirty filter/coil

E140Outdoor

Outdoor fan motor 1 error

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

E141Outdoor

Outdoor fan motor 1 feedback error

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

E142Outdoor

Outdoor fan motor 2 error

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

E143Outdoor

Outdoor fan motor 2 feedback error

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

E151Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E152Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E153Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E154Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E155Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E156Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E158Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E159Communication

Indoor unit communication/disconnection error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E161System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E162System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E163System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E164System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E165System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E166System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E167System

Indoor EEPROM option error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E169System

Indoor tracking/configuration error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E177System

Indoor option setting error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E178System

Indoor option setting error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E179System

Indoor option setting error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E191Sensor

Outdoor temperature sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E201Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E202Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E203Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E204Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E205Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E206Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

E221Sensor

Outdoor ambient temperature sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E231Sensor

Outdoor condenser temperature sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E251Sensor

Compressor discharge temperature sensor open/short

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E320Sensor

Outdoor temperature sensor abnormal

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E407Inverter

Compressor tracking error

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E426Sensor

Outdoor temperature sensor error

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E440System

Indoor/outdoor operation mode mismatch

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E461Inverter

Compressor startup abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E465Inverter

Compressor voltage limit control abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E466Inverter

Compressor voltage abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E467Inverter

Compressor rotation abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E468Sensor

Compressor current sensor abnormal

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E469Inverter

Compressor lock abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E470Inverter

Compressor overload abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E471Inverter

Compressor overcurrent abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E472Inverter

Compressor low-voltage abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E473Inverter

Compressor high-voltage abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E474Inverter

Compressor operation abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E475Inverter

Compressor operation abnormal

Typical causes

Inverter IPM/power module protection trip
Compressor electrical overload, lock, or start failure
DC bus voltage/current abnormality
Outdoor power-stage or driver circuit fault

E484Sensor

Inverter IPM overtemperature protection

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E485Sensor

Outdoor current sensor abnormal

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E500System

EEPROM error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E554Sensor

Compressor discharge temperature too high

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

E556System

System fault

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

E601Communication

Indoor-outdoor communication error

Typical causes

Loose or damaged interconnection cable between indoor and outdoor units
Poor terminal contact or corroded wiring joints
Indoor PCB or outdoor PCB communication circuit fault
Power supply instability after restart or outage

EASystem

Outstanding unit quantity/configuration error

Typical causes

Configuration or addressing mismatch between units
EEPROM/option data error in control board memory
System control logic fault
Power interruption affecting startup sequence

ECSensor

Invalid temperature input error

Typical causes

Thermistor or sensor open/short circuit
Loose sensor connector or harness damage
Sensor drift from heat/moisture exposure
PCB sensor input channel fault

EDOutdoor

Outdoor unit abnormality

Typical causes

Outdoor fan/airflow or pressure protection trigger
Condenser airflow restriction or heavy dirt loading
Refrigerant pressure imbalance, restriction, or undercharge/overcharge
Outdoor PCB protection circuit fault

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