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Error code reference
Samsung HVAC Error Codes
12 error codes documented with diagnostic procedures.
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E121Indoor temperature sensor error (short or open circuit).E139CO2 sensor error (short or open circuit); CO2 input pulse maintains High or Low status…E153EEPROM error (EEPROM error count >= 5 failures during read/write test).E201MASTER ERV tracking errorE202System failure by communication errorE221Outdoor temperature sensor error (short or open circuit).E561Supply air (SA) fan motor errorE562Exhaust air (EA) fan motor errorE601Communication error between the wired remote control and the ventilatorE606COM1/COM2 cross installation errorE652Communication error by installing COM1 dual MASTERE654Damper error
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