LG Heat Pump Error Code E167

E167 indicates that during the piping check routine, the system detected an unexpected temperature change at the evaporator outlet sensor of an indoor unit that was not the one being tested. This points to a configuration or connection problem in a multi-zone system. The most likely causes are incorrect indoor unit address assignments or crossed refrigerant line connections.

The system may restrict or disable normal operation while E167 is active since it indicates a configuration problem that could result in improper refrigerant distribution. Continuing to attempt operation without resolving the root cause risks inefficient performance and potential compressor stress. It is best to address the error before resuming regular use.

If the fix involves only reprogramming indoor unit addresses, labor costs could range from roughly 75 to 150 dollars depending on your area and the number of units involved. If physical piping connections need to be corrected or a faulty EVAP OUT sensor needs replacement, total costs including parts and labor could range from 150 to 400 dollars or more. A technician's diagnostic visit will clarify the exact cause before parts are ordered.

Checking and correcting indoor unit address settings via DIP switches or electronic configuration menus is something a knowledgeable DIYer can attempt using the system's installation documentation. However, verifying refrigerant piping connections and re-running the piping check procedure typically requires a certified HVAC technician, especially if refrigerant lines need to be rerouted or if sensor testing is involved.

A power reset may temporarily clear the error display, but E167 will return the next time a piping check is performed if the underlying address or piping issue has not been corrected. The piping check must be re-run after any corrections are made to confirm the error is resolved. A reset alone is not a fix.