Samsung Dryer AC — What It Means & How to Fix It
Also shown as Et, AE, EEE, AE4, AE3, AE5, E3, 1 AC on some models.
AC means the Samsung dryer's internal boards have lost reliable communication with each other — frequently a one-off glitch that a full power-down clears, but a persistent AC points to a wiring or control-board fault.
What this code means
The main control and the sub-boards, such as the panel and the motor or inverter control, constantly talk to each other. AC — along with AE, Et and the AE3, AE4 and AE5 variants — is logged when that link drops or garbles. A brief electrical disturbance causes a temporary AC, while a loose connector, chafed harness, or failing board causes one that keeps returning.
AC is an internal-communication code, so the only safe user step is a full power cycle. Everything past that — the connectors and boards behind the panels — is technician territory.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Temporary control glitch after a power surge or brownout | Common | Yes — power reset only |
| Loose or unseated wiring connector between boards | Occasional | No — technician job |
| Chafed or damaged wiring harness | Occasional | No — technician job |
| Failed main control or sub-board | Occasional | No — technician job |
What you can try yourself
- Turn the dryer off completely — unplug it or switch off its breaker — and leave it for at least 60 seconds so both boards fully power down.
- Restore power and start a cycle. A single AC caused by an electrical blip usually won't return.
- Make sure the dryer is on its own dedicated outlet, not sharing a circuit or running through an extension cord, since power dips can unsettle the boards.
- If AC keeps appearing, note how often and book a technician — the fault is in the wiring between boards or a board itself, neither of which is a user-serviceable part.
When to call a technician
- AC returns repeatedly despite full power cycles.
- The dryer behaves erratically — an unresponsive panel, cycles quitting midway — alongside the code.
- The code started after a known power event and won't clear.
Typical professional repair cost: If a board is at fault, a Samsung dryer main control or sub-board replacement typically runs $200–$400 with labor.
Frequently asked questions
How do I reset a Samsung dryer communication error?
Cut power to the dryer entirely, either by unplugging it or switching off its breaker, and wait at least a minute before restoring power. This lets the internal boards restart together. A communication error from a momentary power disturbance usually clears this way; one that keeps returning needs a technician.
What causes an AC or AE code on a Samsung dryer?
It's a breakdown in the signal between the dryer's control boards. A power surge can cause a temporary one, but a recurring AC or AE usually means a loose connector, a damaged wiring harness, or a failing board. Only the power-cycle step is a safe DIY action; the rest is a repair.
Related Samsung codes
- Samsung Dryer dC Your Samsung dryer shows dC when it can't confirm the door is shut and latched, so the drum won't turn — usually a door caught on laundry, a misaligned strike, or a tired latch switch rather than anything deep inside the machine.
- Samsung Dryer HC HC is Samsung's overheating warning: the dryer sensed the drum getting hotter than it should and cut the heat to stay safe — nine times out of ten because a clogged lint filter or blocked exhaust vent is trapping heat inside.
- Samsung Dryer tS tS on a Samsung dryer flags a problem with the temperature reading itself — the sensor is reporting a value the control doesn't trust — and the most common trigger is a clogged lint filter or vent throwing readings off rather than a dead part.
- Samsung Dryer 9C1 9C1 tells you the Samsung dryer is seeing abnormal electrical supply — too high, too low, or unstable — most often from an extension cord, a shared or miswired outlet, or a power cord that isn't fully seated.
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