C121
Samsung
Samsung air conditioner error C121
Meaning
Room TH sensor error
Models
AR09TXFCAWKNEU, AR09TXFCAWKXEU, AR12TXFCAWKNEU, AR12TXFCAWKXEU, AR24TXEAAWKNEU
Meaning
Indoor room temp sensor error
Models
AR09TXFCAWKNEU, AR09TXFCAWKXEU, AR12TXFCAWKNEU, AR12TXFCAWKXEU, AR24TXEAAWKNEU
Causes and how to check
- the repair procedure printed in the service manual
- the cited manual page, and follow-up questions
No account needed to look up codes.
Model series: AR
Guides
- Checking an air conditioner temperature sensor (thermistor)
How to check the room, coil or discharge sensor when the unit reports a sensor error: measure its resistance and compare with the exact model's table.