Samsung Air Conditioner Error Code E157

E157 indicates an option setting error on the indoor unit's control board. Specifically, the SW03 option switch on the indoor PCB is set to a configuration that the unit's control system does not recognize or accept. The unit will not operate normally until the switch is set to the correct positions for that model and installation.

E157 is not a safety-critical fault involving refrigerant leaks, electrical shorts, or fire risk. It is a configuration error that prevents the unit from operating correctly. However, you should not attempt to bypass or ignore the error, as running a misconfigured unit could cause operational issues. Leave the unit off and contact a qualified technician to correct the switch settings.

If the fix is simply adjusting the SW03 switch settings, the primary cost is the technician's labor for the service visit, which typically ranges from $75 to $200 depending on your location. If the SW03 switch or the indoor PCB needs to be replaced, parts costs can add $100 to $400 or more depending on the model and part availability. Getting a diagnosis from a certified technician is the best way to get an accurate estimate.

Fixing E157 requires accessing the indoor unit PCB and inspecting the SW03 option switch. A technician will check the current switch positions and compare them against the correct configuration for the specific model. If the positions are wrong, adjusting them to the correct settings will clear the error. If the switch itself is damaged or the PCB is faulty, component replacement may be necessary.

A simple power reset will not permanently clear E157 because the root cause is a physical switch setting on the indoor PCB. Each time the unit powers on, it reads the SW03 switch and will re-trigger the error if the switch positions are still incorrect. The underlying configuration issue must be corrected before the error will stay cleared.