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Error code reference

Samsung Air Conditioner Error Code E476

DC link voltage error (under 150V or over 410V).

Samsung codesSamsung air conditioner codes

DC link voltage error (under 150V or over 410V).

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What E476 means on a Samsung air conditioner

The E476 error code on a Samsung air conditioner indicates a DC link voltage fault. The DC link is the high-voltage DC bus that sits between the rectifier stage and the inverter stage of the variable-speed compressor drive circuit. After AC power is rectified and filtered through the main capacitor bank, the resulting DC voltage is fed into the inverter, which drives the compressor motor at variable speeds. Samsung specifies that this DC link voltage must remain between 150V and 410V during operation. If the voltage drops below 150V or climbs above 410V, the control board triggers E476 to protect the compressor and power electronics from damage.

Low DC link voltage, below the 150V threshold, typically points to problems on the input side of the power circuit. Weak or dropping supply voltage from the utility, a failing rectifier diode, or a degraded filter capacitor can all prevent the DC bus from charging to a proper level. A capacitor that has lost significant capacitance will cause the DC link voltage to sag under load, dropping below the minimum threshold when the compressor attempts to start or ramp up.

High DC link voltage, above the 410V threshold, is often caused by regenerative voltage spikes during compressor deceleration, overvoltage on the incoming AC supply, or a failure in the braking or discharge circuit that normally bleeds off excess energy. A faulty inverter board that cannot dissipate or regulate this voltage is also a common contributor. Because the DC link operates at potentially lethal voltage levels, diagnosis and repair of this circuit should be performed only by technicians with appropriate high-voltage training and equipment.

Source: manufacturer service documentation.

Common causes of E476

  1. 01

    Low AC supply voltage from utility

    Wiring / connection

    If the incoming voltage from the electrical panel is consistently low or experiencing sags, the DC link will not charge to a sufficient level and will fall below the 150V minimum threshold. Check the supply voltage at the disconnect with a multimeter under load conditions.

  2. 02

    Failed or degraded DC filter capacitor

    Part replacement

    The large electrolytic capacitor on the DC link bus stores and smooths the rectified voltage. A capacitor that has dried out or lost capacitance will cause the DC bus voltage to drop under load, triggering the under-voltage fault. Capacitors should be tested for capacitance and ESR after fully discharging the circuit.

  3. 03

    Faulty inverter control board

    Part replacement

    The inverter board regulates DC link voltage and drives the compressor. Internal failures on this board, including failed IGBTs, gate driver circuits, or voltage sensing components, can cause incorrect voltage readings or actual voltage excursions that trigger E476.

  4. 04

    Rectifier diode failure

    Part replacement

    The bridge rectifier converts incoming AC to DC. A shorted or open diode in the rectifier assembly will cause abnormal DC output voltage, pushing the DC link below the minimum threshold. Diodes can be tested for forward voltage drop and reverse leakage after the capacitors are fully discharged.

  5. 05

    Overvoltage on AC supply line

    Wiring / connection

    Utility overvoltage or voltage spikes from nearby equipment can charge the DC link above the 410V upper limit. If the error appears intermittently, use a power quality meter to log incoming line voltage over time and check for surges or sustained overvoltage conditions.

See the test procedure for each cause

Frequently asked questions about E476

What does E476 mean on a Samsung air conditioner?
E476 is a DC link voltage error that activates when the internal high-voltage DC bus in the compressor drive circuit falls below 150V or rises above 410V. Samsung uses this fault to protect the compressor and inverter electronics from running under abnormal electrical conditions. The unit will shut down and display this code until the voltage returns to a safe operating range and the fault is cleared.
Can I fix E476 on my Samsung air conditioner myself?
The DC link circuit operates at voltages that can be lethal, and filter capacitors can retain a dangerous charge even after the unit is powered off. Basic checks, such as verifying the incoming AC supply voltage at the disconnect, are within reach of a careful DIYer. However, testing and replacing components like capacitors, rectifier assemblies, or the inverter board should be handled by a qualified technician with high-voltage experience and proper discharge tools.
Is it safe to keep using my air conditioner when E476 is displayed?
No. The unit will typically shut itself down when E476 is active, which is the correct protective response. Attempting to override or repeatedly restart the unit without addressing the root cause risks damaging the compressor, burning out the inverter board, or creating a fire hazard. Leave the unit off until the fault is diagnosed and repaired.
Will resetting the unit clear the E476 error code?
A power reset may temporarily clear the error and allow the unit to restart, but if the underlying voltage problem persists, E476 will return. A reset is useful for ruling out a transient voltage event, such as a brief utility sag, but it is not a repair. If the code returns after a reset, the electrical components need to be inspected and tested.
How much does it cost to repair a Samsung air conditioner with an E476 error?
Repair costs vary depending on which component has failed. A service diagnostic visit typically runs in the range of $75 to $150. Capacitor replacement is generally less expensive, often in the $100 to $250 range including parts and labor. Inverter board replacement is more costly, commonly ranging from $250 to $600 or more depending on the unit model and part availability. If the incoming supply voltage is the issue, an electrician may need to evaluate the circuit, adding to the total cost.

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