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Error code reference

Samsung Dishwasher Error Code dC3

Auto Door Open Actuator failure

Samsung codesSamsung dishwasher codes

Auto Door Open Actuator failure - door did not open after multiple attempts (3 minutes On, 10 seconds Off retry, then 3 minutes On again).

First step from the service manual

Check Auto Door Open Actuator operation and wiring.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What dC3 means on a Samsung dishwasher

The dC3 error code on a Samsung dishwasher indicates a failure in the Auto Door Open system, specifically that the door actuator did not successfully open the door after multiple controlled attempts. Samsung's Auto Door Open feature is designed to automatically unlatch and crack the door open at the end of a cycle, allowing steam to escape and dishes to dry more efficiently using ambient air. When the control board detects that the door has not opened despite repeated actuator attempts, it logs the dC3 fault and halts further operation of the auto-open function.

The retry sequence the system follows before triggering dC3 is precise: the actuator is powered on for 3 minutes, then cycled off for 10 seconds, then powered on again for another 3 minutes. If the door remains closed throughout this entire sequence without the expected position feedback confirming a successful open, the fault is registered. This suggests the control board is actively monitoring door position, likely through a switch or sensor, and comparing it against the actuator's commanded state.

The most common causes of this fault are a mechanically failed or seized actuator motor, a wiring harness issue between the control board and the actuator, or an obstruction preventing the door latch from releasing. In some cases, a faulty door position sensor can falsely report a closed-door condition even when the actuator is functioning correctly. Diagnosing this code begins with physically inspecting the Auto Door Open actuator for signs of binding, damage, or connector corrosion, and verifying continuity through the wiring harness.

Source: manufacturer service documentation.

Common causes of dC3

  1. 01

    Failed Auto Door Open Actuator

    Part replacement

    The actuator motor that physically pushes the door open may have seized, burned out, or stripped internally. If the actuator does not move when power is applied, it will need to be replaced.

  2. 02

    Wiring or Connector Issue

    Wiring / connection

    A broken wire, loose connector, or corroded terminal between the control board and the actuator can prevent the actuator from receiving power or sending feedback. Inspect the harness for visible damage and check connector pins for corrosion or looseness.

  3. 03

    Door Latch Obstruction or Mechanical Blockage

    Wiring / connection

    A dish rack, utensil, or debris positioned near the door latch can physically prevent the door from opening even when the actuator operates correctly. Check the latch area and door perimeter for any obstructions.

  4. 04

    Door Position Sensor Fault

    Part replacement

    If the sensor responsible for confirming door open status is faulty or misaligned, it may report the door as closed even after a successful open attempt, causing the control board to log dC3. Verify sensor operation and alignment.

  5. 05

    Control Board Fault

    Part replacement

    In rare cases, the main control board may fail to properly deliver power to the actuator circuit or misinterpret sensor signals. This is typically diagnosed only after the actuator, wiring, and sensor have been ruled out.

See the test procedure for each cause

Frequently asked questions about dC3

What does dC3 mean on a Samsung dishwasher?
The dC3 code means the Auto Door Open actuator failed to open the door after repeated attempts. Samsung dishwashers with this feature are designed to automatically crack the door open at the end of a drying cycle to release steam. The system tries the actuator in a specific timed sequence, and if the door does not open, the dC3 fault is stored. The underlying cause is usually a failed actuator, a wiring problem, or a mechanical obstruction at the door.
Can I fix the dC3 error myself?
Some causes of dC3 are DIY-friendly, such as clearing a physical obstruction near the door latch or reseating a loose wiring connector. If the actuator motor itself has failed, replacing it requires disassembling the door panel, which is a more involved repair but manageable for experienced DIYers. If the control board is at fault, professional repair is recommended.
Is it safe to keep using my dishwasher with a dC3 error?
The dC3 error specifically affects the Auto Door Open function, not the core wash or drain systems. Your dishwasher will still clean dishes, but the automatic door-open drying feature will not work until the fault is resolved. It is safe to continue using the appliance in the short term, though drying performance may be reduced without the steam-release function.
Will resetting the dishwasher clear the dC3 error?
A power reset may clear the error code temporarily, but if the underlying cause is not corrected, the fault will return the next time the auto-open sequence runs. Resetting is useful for ruling out a one-time control glitch, but a recurring dC3 code points to a hardware problem that requires physical inspection and repair.
How much does it cost to repair a dC3 error on a Samsung dishwasher?
Repair costs depend on the root cause. If only a wiring connector needs reseating, there may be no parts cost at all. Replacing the Auto Door Open actuator typically involves parts costs in the range of $30 to $80, plus labor if a technician is hired. A full service call including diagnosis and actuator replacement generally runs between $100 and $250 depending on your region and service provider.

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