Samsung Air Conditioner Error Code 271

Error code 271 on a Samsung air conditioner indicates a SUMP temperature digital sensor fault. The control board has detected that the sensor signal voltage is either above 4.95V, which corresponds to a temperature below -30C, or below 0.5V, which corresponds to a temperature above 151C. Both conditions are outside the valid operating range and point to an open or short circuit in the sensor or its wiring. The unit will not operate normally until the fault is resolved.

Operating the unit with error code 271 active is not recommended. The SUMP temperature sensor provides data the control system uses to manage operation safely, and running without a valid sensor reading can lead to undetected temperature conditions or further component stress. It is best to leave the unit off until the sensor circuit is inspected and repaired.

A power reset may temporarily clear the error code display, but the fault will return as soon as the control board reads the sensor signal again and finds it outside the valid voltage range. Error code 271 is a hardware fault, not a software glitch, so resetting the unit does not fix the underlying problem. The sensor circuit must be inspected and the wiring or sensor repaired or replaced before the error will clear permanently.

Some causes of error code 271 are DIY-friendly, such as reseating a loose connector or cleaning corroded terminals on the sensor wiring harness. Start by checking the physical connections between the SUMP temperature sensor and the PCB for any disconnected or poorly seated plugs. If the wiring and connectors are intact, testing and replacing the sensor or repairing the harness may require basic electrical tools and some comfort with appliance diagnostics. PCB-level faults should be handled by a qualified technician.

Repair costs depend on the root cause. If the fix is simply reseating a connector, there may be no parts cost at all, though a service call typically runs between 75 and 150 dollars. A replacement SUMP temperature sensor generally costs between 20 and 80 dollars in parts, with additional labor if a technician performs the work. If the main PCB is at fault, parts and labor combined can range from 200 to 500 dollars or more depending on the model.