CFGeneral

Filter cleaning reminder

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

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

Samsung Aircon Error Codes

Samsung code table

Other diagnostic tools