Samsung · Air conditioner
E121
Room temperature sensor issue
This code is associated with an open or short circuit in the room-temperature sensor.
Contact Samsung Support because sensor inspection requires a technician.
Possible meaning
This code is associated with an open or short circuit in the room-temperature sensor.
This information is not a professional diagnosis or repair instruction. The same code can mean different things by model, so follow the product manual and official manufacturer guidance first.
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Official manufacturer sourceVerify with official guidance ↗Official source checked: 2026-08-21