Samsung Air Conditioner Error Code t3

The T3 error code on a Samsung air conditioner indicates a PWM discharge temperature sensor open or short circuit fault. The outdoor unit control board detected a sensor voltage above 4.95V or below 0.5V, which represents an out-of-range temperature reading below -30°C or above 151°C respectively. This fault only activates when outdoor temperatures are above -10°C. The system shuts down to protect the compressor until the sensor issue is resolved.

You should not continue operating the unit with an active T3 error. The discharge temperature sensor is a key protection component for the compressor, and running the system without accurate discharge temperature monitoring can lead to compressor overheating or failure. Address the fault before resuming normal use.

Repair costs vary depending on the root cause. A replacement discharge temperature sensor is generally an affordable part, typically in the range of $15 to $60 for the component alone. Labor for a technician visit can add $75 to $200 or more depending on your region and the time required. If the outdoor PCB requires replacement, total costs can rise significantly, often into the $300 to $600 range or higher.

A knowledgeable DIYer can start by checking whether the discharge temperature sensor connector is securely seated on the outdoor PCB and inspecting the wiring for obvious damage. Measuring sensor resistance with a multimeter can confirm whether the thermistor has failed. However, if refrigerant system work or PCB replacement is involved, a licensed HVAC technician is required.

A power reset may temporarily clear the T3 error code, but it will return if the underlying sensor or wiring fault has not been repaired. Because the control board actively monitors sensor voltage during operation, any persistent open or short circuit condition will trigger the code again once the unit attempts to run.