Samsung Heat Pump Error Code E422

E422 indicates a self-diagnosis error with oil valve 1, also called the equal oil valve. The system detected either an open or close error during the valve's operating cycle, or identified a problem with the temperature sensor assigned to monitor that valve. The fault could be caused by a disconnected sensor, a failed sensor, wiring damage, or a malfunctioning valve.

Continuing to operate the heat pump with an active E422 error is not advisable. The oil equalization valve is part of the refrigeration system's oil management circuit, and running the unit with a confirmed valve or sensor fault could lead to inadequate oil return, potentially causing compressor damage over time. The system should be inspected before resuming normal operation.

Repair costs vary depending on what is causing the fault. If only the temperature sensor needs replacement, parts and labor costs are typically in the range of $100 to $300. If the oil valve itself requires replacement, costs can rise to the $300 to $700 range or higher depending on parts availability and labor rates in your area. A diagnostic service call is usually needed first to confirm the specific failed component.

A homeowner can visually check whether the oil valve 1 temperature sensor appears loose or disconnected, which is the first recommended diagnostic step. However, further diagnosis requires accessing live sensor data through Samsung's S-net interface or view mode, and replacing refrigeration circuit components like the oil valve requires certified technician work. Professional service is strongly recommended for anything beyond a basic visual inspection.

A power reset may temporarily clear the error code, but E422 will return if the underlying fault with the oil valve sensor or the valve itself has not been corrected. The Samsung self-diagnosis routine will recheck the valve during operation and re-trigger the fault if the problem persists. A reset should only be used after the root cause has been identified and repaired.