Samsung C1 codes: four faults Samsung sends straight to an engineer

What Does Error C1 (21, 22, 54, 63) Mean?

Samsung publishes four indoor faults under a C1 heading with a two-digit detail: a defective room temperature sensor, a defective heat exchanger temperature sensor, a fan that is not rotating, and EEPROM data corruption. For all four, Samsung's stated instruction is to contact a service centre, so none of them has an owner-level remedy. Applies to: Samsung indoor air conditioner units that display the C1 group of service codes described in Samsung support material These four entries are drawn from Samsung indoor air conditioner support material. Samsung display conventions differ between generations and regions, and the same four faults appear on other Samsung equipment as longer numeric codes. Confirm against the manual for your own indoor unit before matching a detail digit to a component. Owner-safe checks: Read and photograph the full display, including both parts of the code, before the unit is switched off or the power is interrupted. | Establish whether the indoor fan produces any airflow at any setting, standing clear of the outlet while you check. | Compare the displayed room temperature with a separate thermometer and note both figures with the date. Qualified technician: Samsung's stated instruction for every fault in this group is to contact a service centre, and each of the four sits behind the indoor casing. | Do not run the system with an indoor fan that is not turning. Air moving across the coil is what keeps the refrigerant circuit inside its designed operating range.