Samsung · Washer Moderate

LO — / FL — Door lock failure

The control board commanded the door lock but did not receive confirmation that it engaged (or it won't release). Often a wiring/lock problem rather than a stuck door.

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

How to fix it

  1. Unplug the washer or trip the breaker for 5 minutes — the lock often releases on power-down.
  2. If the door is still locked, drain the tub via the front filter before forcing it open.
  3. Remove the top panel and check the door lock harness for damage or loose connectors.
  4. Test continuity across the door lock terminals per the tech sheet — replace lock if out of spec.
  5. If a new lock and intact wiring don't fix LO/FL, replace the main control board.

Why it happens

Typical signs: Door won't unlock at end of cycle · Cycle stops early with LO or FL · Clicking from door area but no latch

  • Failed door lock solenoid Most common — solenoid burns out or microswitch contacts fail.
  • Wire harness damage Chafed wires between door lock and main control.
  • Main control board fault PCB no longer drives the lock circuit correctly.

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.

  • Samsung door lock assembly Common replacement
    Amazon →

Related repair guides

Front-Load Washer Door Won't Open — How to Fix It →

More Samsung washer codes

3C 3C / 3E — Motor Fault 4C 4C / 4E — Water Supply Error 4C2 4C2 — Hot water connected to cold inlet 4E 4E — Water supply error (older code, same as 4C) 5C 5C / 5E / SC — Will Not Drain 5E 5E — Drain error (older code, same as 5C)

All Samsung codes → All washer codes →

Frequently asked questions

What does the LO code mean on a Samsung washer?

The control board commanded the door lock but did not receive confirmation that it engaged (or it won't release). Often a wiring/lock problem rather than a stuck door.

What causes the LO code on a Samsung washer?

Failed door lock solenoid: Most common — solenoid burns out or microswitch contacts fail. Wire harness damage: Chafed wires between door lock and main control. Main control board fault: PCB no longer drives the lock circuit correctly.

Is it safe to keep using a Samsung washer with a LO error?

Yes, with caution. This is rated a moderate-severity fault.

How do I fix LO on a Samsung washer?

Unplug the washer or trip the breaker for 5 minutes — the lock often releases on power-down. If the door is still locked, drain the tub via the front filter before forcing it open. Remove the top panel and check the door lock harness for damage or loose connectors.

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.