Samsung Air Conditioner Error Code E167

E167 indicates that during the system's piping check routine, a change in evaporator outlet temperature was detected on an indoor unit that was not supposed to be active at that moment. This points to a unit addressing conflict or an Electronic Expansion Valve that is not closing correctly. The piping check is a commissioning-stage test that confirms each indoor unit is connected to its correct refrigerant branch.

E167 typically appears during the initial commissioning piping check and will prevent the system from completing startup in normal operation mode. Running the system with an unresolved EEV fault risks inadequate refrigerant distribution, which can cause compressor strain over time. It is best to resolve the error before placing the system into regular service.

A power reset may clear the error temporarily, but if the underlying cause, such as an address mismatch or a faulty EEV, has not been corrected, E167 will return the next time a piping check is run. The piping check must complete successfully without detecting unintended temperature changes before the system will operate normally. A proper repair of the root cause is required for the error to stay cleared.

Correcting an indoor unit address mismatch is something a knowledgeable technician or installer can do by adjusting DIP switch or rotary address settings and then re-running the piping check. However, diagnosing and replacing an EEV or PCB requires refrigeration system knowledge and access to internal components, so professional service is recommended for those steps. Attempting repairs without proper tools and training may worsen the fault.

If the fix is simply correcting an address setting, labor costs are typically modest, generally in the range of $75 to $150 for a service call. If an EEV replacement is required, parts and labor combined can range from $200 to $500 or more depending on the unit model and local labor rates. A PCB replacement would fall at the higher end of that range or beyond.