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Samsung Air Conditioner Error Code E572

Inverter zero crossing error

Samsung codesSamsung air conditioner codes

Inverter zero crossing error

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What E572 means on a Samsung air conditioner

The E572 error code on a Samsung air conditioner indicates an inverter zero crossing error. Zero crossing refers to the point at which an alternating current (AC) waveform crosses zero volts during its cycle. The inverter control board monitors these zero crossing points to synchronize the timing of the compressor's variable-speed drive. When the inverter module cannot detect or properly track these zero crossing signals, it loses the reference point needed to control the compressor motor efficiently, triggering the E572 fault.

This error is rooted in the inverter PCB assembly and its interaction with the power supply and compressor circuit. The zero crossing detection circuit typically relies on a combination of opto-isolators, resistor networks, and microcontroller inputs on the inverter board. A loss of signal can result from a damaged detection circuit on the board itself, unstable or distorted incoming AC power, or a wiring fault between the power supply section and the inverter module.

Common contributing factors include a failing or failed inverter PCB, power line voltage irregularities such as significant voltage sags or spikes, loose or corroded wiring connections at the inverter board terminals, and in some cases a compressor with winding issues that generates electrical noise disrupting the zero crossing signal. Because this fault directly affects compressor motor control, the system will typically shut down operation to prevent damage to the drive components.

Source: manufacturer service documentation.

Common causes of E572

  1. 01

    Faulty inverter PCB

    Part replacement

    The inverter control board contains the zero crossing detection circuit, and component failure on this board is the most frequent cause of E572. Inspect the board for burned components, bulging capacitors, or visible damage.

  2. 02

    Unstable or irregular AC power supply

    Wiring / connection

    Significant voltage fluctuations, sags, or distortion on the incoming power line can disrupt the zero crossing reference signal. Check line voltage at the unit with a multimeter under load to confirm stable supply voltage.

  3. 03

    Loose or corroded wiring connections at the inverter board

    Wiring / connection

    Poor electrical connections at the inverter board terminals can interrupt the zero crossing signal path. Inspect all connectors and terminal blocks on the inverter assembly for corrosion, looseness, or heat damage.

  4. 04

    Compressor winding issue generating electrical noise

    Part replacement

    A compressor with degraded windings can produce electrical noise that interferes with the inverter's zero crossing detection. Testing compressor winding resistance and insulation resistance can help identify this condition.

  5. 05

    Failed opto-isolator or detection component on the inverter board

    Part replacement

    The zero crossing detection circuit uses opto-isolators and associated resistors to pass the AC reference signal to the microcontroller. A failed opto-isolator will break this signal path and trigger E572 even if the broader inverter board appears intact.

See the test procedure for each cause

Frequently asked questions about E572

What does E572 mean on a Samsung air conditioner?
E572 indicates an inverter zero crossing error. The inverter module uses zero crossing detection to synchronize compressor motor control, and when this signal is lost or undetectable, the system faults and shuts down. The error points to a problem in the inverter PCB circuit, the power supply, or the wiring connecting those components.
Can I fix the E572 error myself?
Diagnosing E572 involves working with high-voltage inverter circuitry, which carries serious shock risks and should only be handled by a qualified technician. A knowledgeable DIYer may be able to inspect wiring connections and verify line voltage at the disconnect, but replacing or repairing the inverter board requires proper training and safety equipment. Most repairs for this code will require a professional service call.
Will resetting the air conditioner clear the E572 error?
Power cycling the unit may temporarily clear the fault display, but E572 will return if the underlying cause is not resolved. If the error comes back immediately or within a short period of operation, the inverter board or a related component requires diagnosis and repair. A reset alone is not a fix for this error code.
Is it safe to keep running my AC with an E572 error?
The system is designed to shut down when E572 is detected to protect the inverter and compressor from damage caused by uncontrolled motor operation. Attempting to force the unit to run while this fault is active could cause additional damage to the inverter board or compressor. It is best to leave the unit off until the fault is properly diagnosed and repaired.
How much does it cost to repair an E572 error on a Samsung air conditioner?
Repair costs vary depending on the root cause. If the fix involves reseating wiring connections or addressing a power supply issue, costs may be limited to a service call fee, typically in the range of $75 to $150. If the inverter PCB requires replacement, parts and labor combined can range from $300 to $700 or more depending on the unit model and local labor rates. A compressor replacement, if that is the source, would be significantly more expensive.

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