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Samsung Gen 6 fault codes

26 codes from the Samsung manual for the Gen 6 heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
101Indoor unit communication error
102Indoor unit/outdoor unit communication time-out error: errors in more than 6 packets
121Indoor temperature sensor (open/short error)
122Indoor unit eva in sensor (open/short)
153Indoor floating switch secondary detection
202Indoor/outdoor communication error (1 min)
221Outdoor temperature sensor error
237COND temperature sensor error
251[inverter] emission temperature sensor error
440Heating operation blocked
458Outdoor fan 1 error
461[inverter] compressor startup error
462[inverter] total current error / PFC over current error
465Compressor V limit error
466DC LINK over/low voltage
467[inverter] compressor rotation error
468[inverter] current sensor error
471[inverter] OTP error
475Outdoor fan 2 error
E440Heating operation is not available since the outdoor air temperature is over 35 degrees
E465Compressor overload error
E468Current sensor error
E471Outdoor EEPROM error
E484PFC overload error
E911Emergency stop
E912Emergency stop