Samsung Air Conditioner Error Code Bx

The Bx code indicates that the evaporator outlet temperature sensor on one of the indoor units in your Samsung multi-zone system has broken away from or lost contact with its mounting position on the evaporator coil. The "x" identifies which indoor unit is affected by its address number. The system stops normal operation on that unit until the sensor is reattached and the fault is cleared.

The Bx code is not an immediate safety emergency, but it should be addressed promptly. Without an accurate evaporator outlet temperature reading, the system cannot properly control refrigerant flow on the affected unit, which can lead to coil icing or other operational issues over time. The system disables the affected indoor unit as a protective measure until the fault is resolved.

A power reset may temporarily clear the fault display, but the Bx code will return if the underlying sensor breakaway condition has not been physically corrected. The sensor must be properly reattached to the evaporator coil and confirmed secure before the system will resume normal operation on the affected indoor unit without reactivating the fault.

If you are comfortable opening the indoor unit casing and identifying the evaporator coil sensor, you may be able to reseat the sensor in its clip yourself. However, working inside air conditioning equipment involves electrical components, and in many regions refrigerant-related service requires a licensed technician. If the sensor itself has failed or the wiring is damaged, a qualified technician should handle the repair.

If the fix is simply reseating a dislodged sensor, labor costs may be minimal and no parts are required. If the sensor or its mounting hardware needs replacement, expect part costs in the range of $15 to $60 for the thermistor assembly, plus a service call fee that typically ranges from $75 to $150 depending on your location and the technician. Total repair costs for a sensor replacement scenario are generally in the $90 to $250 range.