Samsung · Air Conditioning
This error means there's a problem with the temperature sensor inside the indoor unit that measures the room temperature. It could be an electrical open circuit or a short circuit.
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Turn off the power to the air conditioner at the main breaker.
Inspect the indoor unit for any visible loose connections or damage around the temperature sensor area.
Restore power and restart the unit.
If the error persists, a technician may need to check the sensor's resistance value for shorts or opens.