AC Moderate Easy DIY

Samsung Dishwasher AC — Powers on but cycles won't start

Samsung Dishwasher · Error code AC

What AC Means

The dishwasher powers up and accepts a cycle selection but the start command isn't responding — typically a control panel or door-latch issue.

Symptoms

  • AC on display or controls unresponsive
  • Lights on but no start
  • Buttons feel mushy or unresponsive
  • Cycle abort on Start press

Common Causes

1
Door not fully latched

Door switch not closing the start circuit.

2
Child Lock / Control Lock enabled

Lock icon blocking cycle start.

3
Stuck/failed touch panel

Button membrane shorted or aged.

4
Main board / panel communication fault

Often clears on power cycle.

How to Fix It

  1. Confirm the door is closed firmly and the latch clicks.
  2. Hold the Smart Auto or Delay Start button per your model to disable Child Lock.
  3. Power off at the breaker for 1 minute and restore — many AC codes clear with a hard reset.
  4. Inspect the door switch with a multimeter for continuity when latched.
  5. If still stuck, suspect the touch control board.

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.

Common replacement Samsung dishwasher door latch switch View on Amazon→ Common replacement Samsung dishwasher touch control board View on Amazon→

More Samsung Dishwasher Codes

1C 1C — Low water level / fails to start 1E 1E / IE — Filter clogged / heater fault 3C 3C Error — Wash Pump Failure 3E 3E — Hot water supply too hot 4C 4C / 4E — Water Supply Error 4C5 4C5 / 4E5 — Fill timeout with dry tub

All Samsung codes → All dishwasher codes →

Verified against manufacturer documentation: samsung.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.