C121E21C21On Samsung air conditioners, error code E121 means: Temperature sensor (thermistor) fault. Switch the unit off and try a power reset. If the code comes back, have it checked by a technician before using it again.
Can I keep using the air conditioner?
Switch the unit off and try a power reset. If the code comes back, have it checked by a technician before using it again.
Common causes
- Faulty sensor or component
- Damaged wiring or a loose/corroded connector
How to fix it
- Switch the unit off at the breaker for about 5 minutes, then switch it back on
- If the code returns, contact an authorised AC technician; don't open the unit yourself
Frequently asked questions
What does Samsung error E121 mean?
On Samsung air conditioners, error code E121 means: Temperature sensor (thermistor) fault.
How do I fix Samsung error E121?
Start with these steps: Switch the unit off at the breaker for about 5 minutes, then switch it back on; If the code returns, contact an authorised AC technician; don't open the unit yourself.
Can I keep using the air conditioner with error E121?
Severity: Medium. Switch the unit off and try a power reset. If the code comes back, have it checked by a technician before using it again.