Samsung Gen 6 fault 121
Indoor temperature sensor (open/short error)
Heat pumpWhat it means
Indoor room temperature sensor circuit detected as open or shorted.
Likely causes
- Faulty indoor unit room temperature sensor
- Faulty connection at PCB connector CN41
Where to start
- Check indoor unit room temperature sensor
- Check indoor unit PCB connector CN41 (White)
The full answer, free
- How to put it right, step by step
- The manual page for this fault (page 52), right under the answer
Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.
From the Samsung manual for the Gen 6. Check the model on the data plate before you order parts.
Other Samsung Gen 6 fault codes
- 101Indoor unit communication error
- 102Indoor unit/outdoor unit communication time-out error: errors in more than 6 packets
- 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