Samsung Air Conditioner Error Code t5

The T5 error on a Samsung air conditioner indicates an OPEN or SHORT circuit fault with the oil temperature sensor in the outdoor unit. The PCB detects the fault when the sensor's output voltage exceeds 4.95V, which suggests a broken circuit, or drops below 0.5V, which suggests a short. This error is only active when the outdoor temperature is above -10°C. The system needs the sensor circuit to function correctly in order to protect the compressor.

It is not recommended to continue operating the unit with a T5 error active. The oil temperature sensor is part of the compressor protection system, and without a valid reading the control board cannot confirm the compressor oil is within a safe temperature range. Continued operation risks compressor damage, which is a significantly more expensive repair than addressing the sensor fault.

A power reset may temporarily clear the T5 error display, but if the underlying fault with the oil temperature sensor circuit still exists, the error will return once the unit restarts and the outdoor temperature is above -10°C. Resetting without repairing the cause does not resolve the problem and delays proper diagnosis. The sensor circuit must be inspected and repaired to permanently clear the fault.

A homeowner can safely check whether the sensor connector has come loose at the outdoor unit PCB, which is the first recommended diagnostic step. However, measuring sensor resistance and replacing components in the outdoor unit requires basic electrical knowledge and safe lockout procedures before opening the unit. If you are not comfortable working with electrical components, a qualified HVAC technician should handle the diagnosis and repair.

If the fix is simply reseating a loose connector, there may be no parts cost involved, though a service call fee from a technician typically runs in the range of $75 to $150. Replacing the oil temperature sensor itself generally costs between $50 and $200 including parts and labor, depending on the model and technician rates in your area. If the outdoor PCB requires replacement, costs can range from $300 to $600 or more.