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Samsung Dryer Error Code AC

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 14, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY Also shown as: AC6

Communication error — main and sub control boards not communicating

The main control board and the sub (UI) board have lost reliable communication. Buttons may go unresponsive or the display may freeze. A loose inter-board harness is the most common and most fixable cause; a failed board is the next step.

💰 DIY cost: $0–$280 👨‍🔧 Pro cost: $200–$420 Save $200+ by doing it yourself
Samsung Dryer error code AC on the display panel
How the AC code appears on a Samsung dryer display

What Does Error Code AC Mean on a Samsung Dryer?

Communication error — main and sub control boards not communicating.

The main control board and the sub (UI) board have lost reliable communication. Buttons may go unresponsive or the display may freeze. A loose inter-board harness is the most common and most fixable cause; a failed board is the next step.

What Causes Error Code AC?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Inter-board harness loose or damaged 45% of cases
  2. 2
    Sub/UI board failure 25% of cases
  3. 3
    Main control board failure 20% of cases
  4. 4
    Connector corrosion 10% of cases

How to Fix Samsung Dryer Error Code AC

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Power cycle

    Unplug for 10 minutes — a transient AC often clears.

  2. 2

    Reseat the harness

    Open the console and firmly reseat the ribbon/harness between the main and UI boards.

    ⚠️ Unplug before opening the console.
  3. 3

    Replace the failed board

    If reseating doesn't help, replace the UI board first (cheaper), then the main board.

    🔩 Samsung dryer sub-board ($50–$150) 🔩 Main control board ($100–$280)

How to Reset Error Code AC

Unplug 10 minutes and restart. If AC returns, reseat the harness between the control boards.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Did this guide fix your appliance?

When to Call a Professional

If the harness is sound, professional diagnosis identifies which board has failed.

Average professional repair cost for this issue: $200–$420

Related Error Codes

Et
Communication error — connection between boards
⚠ Medium Severity
bC2
Button card error — control panel communication failure
⚠ Medium Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Samsung Dryer:

🔩
Search PartSelect
Samsung Dryer repair parts
🔧
Search RepairClinic
Step-by-step video guides

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More Samsung Dryer Error Codes

tE Thermistor (temperature sensor) failure HE Heater fault — drum not heating or overheating OD Vent blockage detected bE2 Button error — a control-panel key is stuck 9C1 Power supply error — abnormal/low line voltage 9E1 Line voltage abnormality — supply voltage out of range

Frequently Asked Questions

What does error code AC mean on a Samsung Dryer? +
Communication error — main and sub control boards not communicating
How do I fix error code AC on my Samsung Dryer? +
Start by Unplug for 10 minutes — a transient AC often clears.. If that doesn't resolve it, work through each step in the fix guide above.
How do I clear or reset error code AC? +
Unplug 10 minutes and restart. If AC returns, reseat the harness between the control boards.
Is error code AC serious? +
Medium severity. The appliance may still operate but the issue should be resolved to prevent further damage.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 14, 2026.

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