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Samsung C Series Error Code

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Error CodeMeaningSolution
C101, C102Communication ErrorCheck indoor–outdoor communication wire, terminals, and ensure ODU PCB power ON.
C108Set Address ErrorReset indoor/outdoor address and check DIP switch setting.
C121Indoor Room Temperature Sensor ErrorCheck room sensor wiring, measure resistance, replace sensor if faulty.
C122Indoor Coil Sensor ErrorCheck indoor coil sensor connection or replace sensor.
C123Indoor Coil Sensor Middle ErrorCheck middle coil sensor wiring/resistance; replace if faulty.
C140Indoor Dust Sensor ErrorCheck dust sensor connector and clean/replace sensor.
C142Indoor Humidity Sensor ErrorCheck humidity sensor wiring or replace sensor.
C143Indoor Motion Sensor ErrorCheck motion sensor connection or replace sensor module.
C154Indoor Fan ErrorCheck indoor fan motor, connector, and PCB output.
C161Mixed Operation ErrorCheck mode setting of all indoor units; set same mode (cool/heat).
C162Indoor EEPROM ErrorReset power; if error remains replace indoor PCB.
C163Indoor Option ErrorCheck option code setting and reset correctly.
C187Indoor K1 Filter Feedback ErrorCheck filter switch and wiring.
C665Indoor Drain Pump ErrorCheck drain pump, float switch, wiring, and blockage.
C470Outdoor EEPROM ErrorPower reset; if repeated replace outdoor PCB.
C416Outdoor Discharge Temp Sensor ErrorCheck discharge sensor wiring or replace sensor.
C464Outdoor IPM Over Current ErrorCheck compressor, IPM module, and wiring for short.
C465Outdoor Comp V/I Limit ErrorCheck compressor load, refrigerant pressure, and PCB.
C468Outdoor Current Sensor ErrorCheck current sensor wiring or replace PCB.
C461Outdoor Compressor Starting ErrorCheck compressor wiring, capacitor (if any), and PCB.
C467Compressor Wire MissingCheck compressor terminal wiring and connection.
C469Outdoor DC Link Voltage Sensor ErrorCheck DC link sensor circuit or outdoor PCB.
C488Outdoor AC Input Voltage Sensor ErrorCheck AC input voltage and sensor circuit on PCB.
C458Outdoor Fan ErrorCheck outdoor fan motor, capacitor, and PCB output.
C500Outdoor Inverter PCB Heat Sink Sensor ErrorCheck IPM heat sink temperature sensor and cooling.
C462AC Input Limit TripCheck supply voltage, wiring, and breaker.
C404Overload ErrorCheck compressor load, airflow, and refrigerant pressure.
C574Gas Shortage ErrorCheck refrigerant level and recharge gas.
C422EEV / Valve Close ErrorCheck EEV valve wiring and operation; replace if faulty.
C554Gas Leak ErrorCheck refrigerant leakage points and repair, then recharge gas.
Error CodeMeaningSolution
C466DC Link Voltage Under / Over ErrorCheck DC link capacitor, voltage supply, and outdoor PCB.
C484PFC Over Load ErrorCheck PFC circuit and outdoor PCB.
C483Over Voltage Protection ErrorCheck AC input voltage and stabilizer/power supply.
C221Outdoor Temperature Sensor ErrorCheck outdoor temp sensor wiring or replace sensor.
C251Discharge Temperature Sensor ErrorCheck discharge sensor wiring or replace sensor.
C474Heatsink Sensor ErrorCheck heatsink temperature sensor and PCB connection.
C485Input Current Sensor ErrorCheck input current sensor circuit or replace PCB.
C231Condenser Temperature Sensor ErrorCheck condenser temperature sensor wiring or replace sensor.
C203Compressor Time Out ErrorCheck compressor operation, wiring, and inverter PCB.
C471EEPROM Data Error (Micom Communication)Reset power; if repeated replace outdoor PCB.
C440Prohibit Operation Condition (Heating)Check system condition and operation mode settings.
C441Prohibit Operation Condition (Cooling)Check system condition and operation mode settings.

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