Samsung Air Conditioner Error Code rx

The RX error code on a Samsung air conditioner indicates that the COM1 and COM2 communication wires between the Master wired remote controller and the Slave wired remote controller are cross-installed, meaning they are connected to the wrong terminals. This is a wiring configuration error, not a component failure. The system detects that the communication signals are reversed and shuts down normal operation to flag the problem.

The RX error indicates a communication fault between the remote controllers, which typically prevents normal operation of the system. Continuing to attempt to run the unit without resolving the wiring error is not recommended, as the controllers cannot communicate correctly with the indoor unit. There is no immediate safety hazard from the wiring error itself, but the system will not function properly until the issue is corrected.

Because the RX error is typically a wiring correction rather than a parts replacement, the cost is usually limited to a technician service call and labor. Expect to pay somewhere in the range of $75 to $200 depending on your location and how accessible the wiring terminals are. If any terminals or wiring runs are damaged and need replacement, parts costs are generally low, though total costs could rise depending on the complexity of the installation.

Fixing the RX error requires locating the communication wire terminals on the master remote controller, slave remote controller, and the indoor unit control board. A technician must verify that COM1 and COM2 wires are connected to their matching terminals on each device and are not swapped. Once the wiring is corrected, the system should be powered back on to confirm the error clears. This work should be performed by a qualified technician familiar with low-voltage control wiring.

A simple power reset will not clear the RX error because the underlying cause is a physical wiring problem, not a temporary communication glitch. Each time the system powers on and attempts to establish communication between the master and slave controllers, it will detect the cross-connected wires and re-trigger the fault. The error will only clear permanently once the COM1 and COM2 wiring is corrected at all relevant terminals.