Samsung Air Conditioner Error Code E305

E305 indicates that the condenser midpoint temperature sensor on the outdoor unit has separated or become displaced from its mounting position. This sensor monitors temperature along the condenser coil, and when it detaches, the control board can no longer trust its readings. The system triggers E305 as a protective measure and stops normal operation until the sensor is repositioned and secured.

It is not recommended to continue operating the unit with E305 active. The condenser midpoint sensor provides data the control board uses to manage compressor and fan operation safely. Running the system without a reliable reading from this sensor could lead to improper refrigerant management or stress on the compressor over time.

If the sensor has simply come loose and only needs to be reseated, repair costs are typically limited to a service call fee, which generally ranges from around 75 to 150 dollars depending on the technician and region. If the sensor itself or its mounting hardware is damaged and needs replacement, parts and labor combined can range from approximately 100 to 300 dollars, depending on part availability and local labor rates.

The first step is to power down the unit and inspect the outdoor unit cabinet for the COND-MID sensor, which should be clipped or bracketed to the condenser coil at a midpoint location. If it has come loose, reseat it firmly in its clip and confirm the wiring harness connector is fully plugged in. If the sensor, clip, or wiring is damaged, those components will need to be replaced before the error will clear.

A simple power reset will not permanently clear E305 if the underlying sensor displacement has not been corrected. The error will return as soon as the control board checks the sensor signal again. The sensor must be physically reseated and confirmed secure before the fault will stay cleared after a reset.