Samsung Air Conditioner Error Code E308

E308 indicates a suction temperature sensor open or short circuit error. The control board has detected that the sensor monitoring the return air or refrigerant inlet temperature is either not sending a signal or is sending a signal outside the acceptable range. The cause is typically a loose connector, a broken wire in the sensor harness, or a failed sensor thermistor. The unit stops operating until the fault is resolved to protect the system.

The unit will typically shut itself down when E308 is active, so continued operation is usually not possible without clearing the fault. Attempting to bypass or ignore the error is not recommended, since the suction temperature sensor provides critical data for refrigerant and compressor management. Running the system without accurate sensor input could lead to improper cooling performance or compressor damage over time.

A power reset by turning the unit off and removing power for a few minutes may temporarily clear the error code, but it will return if the underlying wiring or sensor fault is still present. A reset is useful for confirming whether the fault is intermittent or persistent, but it does not fix a broken wire, failed sensor, or damaged connector. The physical cause of the open or short circuit must be identified and corrected for the error to stay cleared.

A knowledgeable DIYer can check for a dislodged connector and reseat it, which sometimes clears the error without any parts. Inspecting the wiring harness for obvious breaks or pinching is also a reasonable first step. However, testing sensor resistance and replacing the thermistor or control board requires basic electrical knowledge and a multimeter. If you are not comfortable working inside the unit, a licensed technician should perform the repair.

If the fix is simply reseating a loose connector, there may be no parts cost and only a service call fee, which typically ranges from $75 to $150. If the suction temperature sensor needs replacement, parts and labor combined generally range from $100 to $250 depending on the unit model and local labor rates. A control board replacement, if required, can push total repair costs to $250 to $600 or more.