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Samsung Dryer Error Code AC

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: July 19, 2026
⚠ Medium Severity 🔧🔧 Moderate DIY Also shown as: AC6

Communication error — main and sub control boards not communicating

The most common cause of the AC error on a Samsung dryer is inter-board harness loose or damaged (~45% of cases); start with: power cycle.

💰 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 AC (or AC6) code fires when the main control board and the sub/UI board fail to exchange data reliably over their inter-board connection. The control monitors this handshake continuously; when messages are missing or corrupted, it flags a communication fault. Unlike a sensor or heater code, AC points at the boards or the harness linking them rather than a specific component. A loose or corroded ribbon connector triggers it far more often than an actual board failure, which distinguishes it from board-death codes.

Models affected: Samsung dryers with a two-board control architecture (separate main and UI/sub boards), spanning both electric and gas models across recent model years
What owners report: Owners commonly report AC appearing at startup or mid-cycle with a frozen display or unresponsive buttons, and many find a simple unplug-for-ten-minutes power cycle clears it, at least temporarily. When it keeps returning, reseating the harness between the console boards is the fix people mention most often; humidity or vibration over time can loosen those connectors.

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.

Full Samsung dryer reset guide → Enter diagnostic mode →

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

External links — ApplianceErrors.com is not affiliated with these retailers.

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

Can I keep using my Samsung Dryer when error AC appears? +
You often can for a cycle or two, but the communication issue behind AC will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes AC on a Samsung Dryer? +
Across reported Samsung dryer repairs, the most frequent is inter-board harness loose or damaged (45% of cases), sub/UI board failure (25%), then main control board failure (20%). Check them in that order before replacing any parts.
AC keeps coming back after a reset — what should I check next? +
A reset only clears the stored AC fault; if it returns, the communication problem is still present. Move on to the physical checks — power cycle, then reseat the harness — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix Samsung Dryer error AC? +
A DIY repair typically runs $0–$280 in parts, versus $200–$420 for a professional service call, so handling it yourself saves around $200. Expect the work to take roughly 30–60 minutes.
Which Samsung Dryer models show error AC? +
AC is documented on Samsung dryers with a two-board control architecture (separate main and UI/sub boards), spanning both electric and gas models across recent model years. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: July 19, 2026.

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