Samsung Air Conditioner Error Code E271

E271 indicates that the SUMP temperature digital sensor in the outdoor unit is producing a voltage reading outside the acceptable range, either above 4.95V or below 0.5V. This points to an open or short condition in the sensor circuit. The fault is only flagged when the outdoor temperature is above -10°C. The unit will not operate normally until the sensor circuit is repaired.

The unit will typically shut itself down when E271 is active, which is the intended protective response. Attempting to bypass or ignore this fault is not advisable, as the SUMP temperature sensor protects the compressor from operating under unmonitored conditions. Continuing to force operation without a functioning sensor could lead to compressor damage.

Repair costs depend on the root cause. If only a connector needs to be reseated, the cost may be limited to a service call fee, typically in the range of $75 to $150. Replacing the SUMP temperature sensor generally costs $100 to $250 including parts and labor. If the control board is at fault, replacement costs can range from $300 to $600 or more depending on the model.

A knowledgeable DIYer can safely inspect the outdoor unit wiring and reseat the sensor connector without working on refrigerant or high-voltage components. However, testing sensor resistance values and replacing the sensor or control board requires some electrical knowledge and the correct tools. If you are not comfortable working around electrical components inside the outdoor unit, a qualified HVAC technician is recommended.

A power reset may temporarily clear the error code display, but E271 will return if the underlying sensor circuit fault has not been corrected. Because the fault is based on a continuous out-of-range voltage reading, the control board will detect and re-flag the condition as soon as the unit powers back up and the outdoor temperature is above -10°C.