FixByModel
AC

Samsung AC: Internal communication error

The main control and a sub-component, such as the panel or inverter board, cannot communicate with each other.

DIY fix

By the FixByModel editorial team · Verified 2026-09 · Researched against manufacturer support & repair references (below)

Most likely causes

  1. Temporary electronic glitch
  2. Loose internal wiring or connector
  3. Failed sub-PCB or main control board
Before you start — unplug the dryer, and on a gas model shut off the gas supply. Let it cool first — the drum, heater and exhaust can be hot. If a step involves the heating element, wiring, or opening the cabinet and you're unsure, stop and call a qualified technician.

Step-by-step fix

1Power downTurn off and unplug the dryer for at least 60 seconds.
2RestartRestore power and run a cycle to see if the code clears.
3Rule out other faultsClean the vent and avoid overloading so no other error is masking the issue.
4Service if persistentIf AC returns, have the internal wiring and control boards inspected.

Still showing AC?

If you’ve worked through every step and AC keeps returning, an internal part likely needs testing and replacement. That’s a job for a qualified appliance technician, who can measure the suspect part against the service-manual spec before replacing it.

Which models this applies to

Samsung dryers. Samsung dryers; equivalent or related communication codes include E3, Et, EEE, and 1AC.

FAQ

What does Samsung AC mean?

Internal communication error. The main control and a sub-component, such as the panel or inverter board, cannot communicate with each other.

What causes Samsung AC?

The most likely cause is temporary electronic glitch. Other causes include Loose internal wiring or connector; Failed sub-PCB or main control board.

Can I fix Samsung AC myself?

Usually yes. Start by working through the steps above, beginning with: turn off and unplug the dryer for at least 60 seconds.