CFGeneral
Filter cleaning reminder
Maintenance/status logic from controller · Temporary operating state during protection or cleaning
Samsung Aircon Error Codes
Learn what common Samsung error codes mean, what typically causes them, and whether they need urgent attention.
Samsung code table
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.
CHSystem
Mode change/mismatch error
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
Maintenance/status logic from controller · Temporary operating state during protection or cleaning
DFGeneral
Auto-defrost in progress
Maintenance/status logic from controller · Temporary operating state during protection or cleaning
E1Indoor
Indoor fan motor abnormal
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
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
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
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)
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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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