Error code
AC
Meaning
The dryer's internal parts aren't communicating properly
Critical
What to do
Why this happens
Potential causes include faulty wiring between PBAs, loose or disconnected wire terminals among them, failure in the main PBA communication circuit, or issues with the display PBA communication circuit.
How to fix it
If unplugging and restarting doesn't fix it, the internal wiring or a control board may need attention. This one needs a professional technician.
SourceSamsung service manual