Samsung Air Conditioner Error Code t2

The Samsung t2 error code indicates a fault in the condenser temperature (COND TEMP) sensor circuit located on the outdoor unit. This sensor monitors the temperature of the outdoor heat exchanger and feeds that data to the control board so the system can regulate compressor operation, fan speed, and protection functions. The error is triggered when the sensor signal voltage falls outside the acceptable operating range: a reading above 4.9V corresponds to a temperature below -50°C and indicates an open circuit condition, while a reading below 0.4V corresponds to a temperature above 93°C and indicates a short circuit condition. Both conditions prevent accurate temperature monitoring and cause the system to shut down as a protective measure.

The outdoor heat exchanger temperature sensor is a negative temperature coefficient (NTC) thermistor, meaning its resistance decreases as temperature increases. When the connector is fully seated and the thermistor is functioning correctly, the PCB reads a voltage that falls proportionally within the expected range. A disconnected or corroded connector breaks the circuit entirely, pushing the voltage toward the supply rail and triggering the open-circuit threshold. A shorted thermistor or wiring fault does the opposite, pulling the voltage too low and triggering the short-circuit threshold.

Diagnosis begins by inspecting the outdoor heat exchanger sensor connector at the outdoor PCB to confirm it is fully seated and free of corrosion or moisture intrusion. With the connector removed, resistance across both terminals of the thermistor should be measured and compared against the temperature-resistance curve for the sensor. A properly functioning NTC thermistor will show measurable resistance that changes predictably with ambient temperature. An open circuit reads infinite resistance, while a shorted sensor reads near zero ohms. Either result confirms the sensor requires replacement.