Washer-dryer combo intermittently stops before spin and shows dC, often accompanied by beeping.

Safety first: Disconnect power before adjusting door components.

Steps to check:

• Inspect door strike: Examine the metal or plastic strike on the door that engages the lock. Tighten any loose screws and ensure it lines up with the lock opening.
• Check gasket interference: Make sure the door boot (rubber gasket) is not folded or deformed in a way that prevents full door closure.
• Test door lock: Close the door and start a cycle. Listen for the lock click. If it is weak or absent, the lock may be failing.
• Replace if needed: If alignment is correct but dC persists, replace the door lock assembly following Samsung service procedures.

When to stop: If a new lock does not resolve the issue, the main PCB may be faulty and should be diagnosed by a professional.