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Error code reference

Samsung Air Conditioner Error Code P522

Outdoor unit EEV close 1 self-diagnosis error.

Samsung codesSamsung air conditioner codes

Outdoor unit EEV close 1 self-diagnosis error.

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What P522 means on a Samsung air conditioner

Error code P522 on a Samsung air conditioner indicates a self-diagnosis failure related to the outdoor unit's Electronic Expansion Valve (EEV) closing function, specifically identified as an EEV close 1 error. The EEV is a precision refrigerant flow control component that modulates the amount of refrigerant entering the indoor heat exchanger. During system startup or shutdown sequences, the control board runs a self-diagnostic routine to confirm the valve can fully close. When the unit detects that the EEV has failed to close properly or cannot confirm closure, it triggers P522 to halt operation and prevent potential refrigerant flooding or compressor damage.

The EEV operates via a stepper motor driven by pulse signals from the outdoor unit PCB. A self-diagnosis error in the close direction can stem from a seized or mechanically stuck valve body, a failed stepper motor winding, broken or shorted wiring in the EEV harness, or a faulty outdoor PCB that is not sending the correct drive signals. In some cases, contamination in the refrigerant circuit or debris lodged in the valve seat can prevent full mechanical closure even when electrical signals are functioning correctly.

Diagnosing this fault requires checking the EEV coil resistance values, inspecting the wiring harness between the valve and the control board for continuity and shorts, and verifying that the PCB is outputting proper pulse signals to the stepper motor. If electrical checks pass but the valve still fails self-diagnosis, the valve assembly itself likely requires replacement. This repair involves working with the sealed refrigerant circuit and should be performed by a certified HVAC technician.

Source: manufacturer service documentation.

Common causes of P522

  1. 01

    Failed or seized EEV stepper motor

    Part replacement

    The stepper motor that physically drives the expansion valve open and closed can fail internally or seize due to wear or contamination, preventing the valve from completing its close cycle. This is one of the most common mechanical causes of this error.

  2. 02

    EEV harness wiring fault

    Wiring / connection

    Damaged, corroded, or shorted wiring in the harness connecting the EEV coil to the outdoor PCB can disrupt the drive signals needed for proper valve operation. Inspect the harness for visible damage, corrosion at connectors, and verify continuity at each pin.

  3. 03

    Defective outdoor unit PCB

    Part replacement

    If the outdoor control board is not generating correct pulse signals to drive the EEV stepper motor, the valve cannot execute its close sequence. This can be confirmed by checking output signals from the board to the EEV connector.

  4. 04

    EEV coil open or short circuit

    Part replacement

    The coil windings on the EEV can develop an open circuit or internal short, causing the stepper motor to lose drive capability. Resistance checks across the coil terminals will reveal whether the coil is within specification.

  5. 05

    Debris or contamination in the valve seat

    Part replacement

    Foreign particles or moisture contamination in the refrigerant circuit can lodge in the EEV valve seat, physically preventing full closure even when electrical components are functioning correctly. This typically requires valve replacement and a system flush.

See the test procedure for each cause

Frequently asked questions about P522

What does P522 mean on a Samsung air conditioner?
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.
Can I fix a P522 error myself?
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.
Is it safe to run my Samsung air conditioner with a P522 error?
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.
Will resetting the unit clear the P522 error?
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.
How much does it cost to repair a P522 error on a Samsung air conditioner?
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.

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