Samsung Air Conditioner Error Code E154

E154 indicates an address mismatch between the wired remote controller and the RMC address of the indoor unit. The indoor unit has a physical switch called SW03 that defines its address, and the wired remote controller must be set to the same value. When these do not match, communication between the two devices fails and the error is triggered. Normal operation will not resume until the addresses are aligned.

A power reset alone will not clear E154 if the underlying address mismatch has not been corrected. The error will return as soon as the system reinitializes and detects the conflict again. The SW03 switch setting and the wired remote controller address must be matched before a reset will result in normal, error-free operation.

In most cases, correcting E154 requires only a technician's time to inspect and adjust switch settings, with no parts needed. A diagnostic and configuration service visit typically runs in the range of $75 to $200 depending on your location and service provider. If the control board is found to be faulty and requires replacement, costs can rise to the range of $200 to $600 or more including labor.

Start by locating the SW03 switch on the indoor unit's control board and noting its current address setting. Then check the address configured in the wired remote controller and confirm both values match. If they differ, adjust the remote controller address or reposition SW03 so both sides use the same address. After correcting the mismatch, power cycle the system to allow it to reinitialize.

E154 is a configuration error, not a safety-related fault. It will prevent normal operation because the indoor unit and wired remote controller cannot communicate, but it does not indicate a hazardous electrical or refrigerant condition. The system is essentially refusing to operate due to an address conflict rather than a component failure or dangerous condition.