Samsung · Dryer Moderate

AC — / AE — Communication Error Between Boards

The user interface board can't communicate with the main control board. Often a loose ribbon cable or a failed board.

Keep using it?
Yes, with caution
DIY difficulty
Moderate
Verified against
samsung.com ↗

How to fix it

  1. Unplug the dryer for 10 minutes.
  2. Remove the top panel and locate the ribbon between the UI and main board.
  3. Disconnect and reseat the ribbon — inspect for bent or corroded pins.
  4. Power up and test. If AC clears, you're done.
  5. If AC returns, swap the UI board first (more common failure point).
  6. If still present after UI swap, replace the main control board.

Why it happens

Typical signs: AC or AE on display · Display works but buttons do nothing · Dryer won't start any cycle · Random reboots

  • Loose / damaged ribbon cable Communication ribbon between UI and main PCB unseated.
  • Failed user interface board UI side of communication has failed.
  • Failed main control board Main PCB communication transceiver has failed.
  • Moisture or corrosion on connectors Humid laundry-room conditions corroding pins.

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

More Samsung dryer codes

3C 3C Error — Motor Error 9E1 9E1 / 9C1 — Power Supply / Voltage Error bE bE / bE2 — Button / Key Stuck C8 C8 — Vent ~80% Clogged (Vent Blockage Test) C80 C80 / C90 — Vent Blockage Detected dC dC / dE — Door Open

All Samsung codes → All dryer codes →

Frequently asked questions

What does the AC code mean on a Samsung dryer?

The user interface board can't communicate with the main control board. Often a loose ribbon cable or a failed board.

What causes the AC code on a Samsung dryer?

Loose / damaged ribbon cable: Communication ribbon between UI and main PCB unseated. Failed user interface board: UI side of communication has failed. Failed main control board: Main PCB communication transceiver has failed.

Is it safe to keep using a Samsung dryer with a AC error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix AC on a Samsung dryer?

Unplug the dryer for 10 minutes. Remove the top panel and locate the ribbon between the UI and main board. Disconnect and reseat the ribbon — inspect for bent or corroded pins.

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: samsung.com.