Samsung · Dryer Moderate

dO — Door Open Error

Cycle won't start because the door is sensed as open. If the door is physically closed, the door switch or strike is the culprit.

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

How to fix it

  1. Open the door, remove any obstructions, and close it firmly until you hear a click.
  2. Inspect the door strike on the cabinet — straighten if bent.
  3. If dO persists, remove the top panel and verify the door switch harness is connected.
  4. Test door switch continuity — replace if it doesn't toggle when pressed.
  5. Replace worn door bumpers if the door doesn't seat squarely.

Why it happens

Typical signs: dO on display · Won't start a cycle · Door visually shut · Latch feels normal

  • Door not fully latched Bedding or stray item blocking the seal.
  • Bent door strike Strike not engaging switch plunger.
  • Failed door switch Plunger stuck or contacts worn open.
  • Loose door switch harness Connector disengaged at switch.

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 AC AC / AE — Communication Error Between Boards bE bE / bE2 — Button / Key Stuck C8 C8 — Lint Filter / Vent Reminder C80 C80 / C90 — Vent Blockage Detected

All Samsung codes → All dryer codes →

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.