Samsung Air Conditioner Error Code t4

The T4 error code indicates a fault with the liquid refrigerant pipe temperature sensor at the condenser outlet, also called the COND OUT sensor. The unit has detected that the sensor signal voltage is either too high (above 4.9V, indicating an open circuit) or too low (below 0.4V, indicating a short circuit). This prevents the system from accurately monitoring refrigerant conditions at that point in the circuit.

It is generally not recommended to continue running the unit while the T4 error is active. Without accurate condenser outlet temperature data, the control board cannot properly manage refrigerant flow and system protection functions. Continued operation could potentially lead to additional component stress or further faults.

Resetting the unit may temporarily clear the code from the display, but the error will return if the underlying sensor fault is still present. A reset does not repair a failed sensor, broken wire, or faulty connector. Proper diagnosis and repair of the root cause is necessary to resolve the T4 error permanently.

A homeowner with basic electrical knowledge can check whether the sensor connector has simply come loose from the PCB, which is the most straightforward fix. However, measuring sensor resistance and diagnosing wiring faults requires a multimeter and some familiarity with HVAC electronics. Replacing the sensor or PCB is best handled by a qualified HVAC technician, particularly because the refrigerant system is involved.

Repair costs depend on the root cause. A loose connector costs nothing beyond a service call, which typically runs between 75 and 150 dollars. A sensor replacement part is generally inexpensive, often in the range of 15 to 60 dollars, but labor charges for diagnosis and replacement can bring the total to between 100 and 250 dollars. PCB replacement is significantly more expensive, potentially ranging from 200 to 500 dollars or more depending on the model.