Samsung Air Conditioner Error Code P522

P522 indicates that the outdoor unit's Electronic Expansion Valve (EEV) has failed its self-diagnostic test for the close function, which Samsung identifies as an EEV close 1 error. The EEV is a motorized valve that controls refrigerant flow, and the system could not confirm that the valve closed properly during its diagnostic routine. The unit shuts down to prevent potential damage to the compressor or refrigerant circuit. A technician will need to inspect the valve, its wiring, and the outdoor control board to identify the root cause.

No, you should not attempt to force the system to run while P522 is active. A malfunctioning EEV that cannot close properly can allow excessive refrigerant to flood the compressor, which can cause serious and costly compressor damage. The system shuts itself down as a protective measure, and that protection should be respected until the fault is repaired.

Repair costs vary depending on the failed component. If only the EEV wiring harness or coil needs replacement, costs are generally lower, typically in the range of $150 to $350 including labor. If the full EEV assembly or the outdoor PCB requires replacement, costs can range from $300 to $700 or more depending on the unit model and local labor rates. A diagnostic service call is usually required first to confirm which component has failed.

Basic electrical checks such as inspecting the EEV wiring harness for visible damage or loose connectors can be performed by a knowledgeable DIYer. However, confirming the fault through resistance testing of the EEV coil and verifying PCB output signals requires a multimeter and some technical experience. If the valve itself needs replacement, that work involves the sealed refrigerant system and legally requires a certified HVAC technician with proper refrigerant handling equipment.

A power reset may temporarily clear the error code if it was triggered by a transient signal issue, but if there is an underlying mechanical or electrical fault with the EEV, the error will return during the next self-diagnostic cycle. Resetting without diagnosing the root cause is not a reliable fix and may delay proper repair while allowing repeated stress on system components.