LG WM2016CW Door Lock & Switch Problems — What Part Fixes This?
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Understanding the Problem
The LG WM2016CW uses a door lock (also called a door switch or interlock) that tells the washer the door is closed and locks it during cycles. When the lock or its switch fails the washer will not start, will show door-related error codes, or will refuse to unlock after a cycle. Below are practical diagnostic and repair steps to find and fix the issue. 1) Confirm the symptom and error codes - Power the washer and try to start a cycle. Note any error codes or messages (common messages: door-related codes or "dL"/"Lo" depending on display). See if the washer beeps or blinks without starting. - Listen for a distinct click at the start of a cycle — the lock solenoid should click as it attempts to lock. 2) Quick visual checks (2–5 minutes) - Inspect the door latch/strike and rubber door boot for physical damage, foreign objects, or debris that prevents proper closure. - Try closing the door firmly and starting a drain/spin cycle to see if it will lock. 3) Determine whether the lock is receiving power (requires a multimeter) - Unplug the washer. - Open the lower access or remove the top/front panel per your model instructions to access the door lock connector (on many LG front-load models the lock sits behind the door seal and is mounted to the front panel). - Reconnect power, set the washer to a cycle and press Start while watching the lock wiring. Carefully measure for voltage at the lock connector when the washer attempts to lock (usually you should see a momentary voltage pulse to energize the solenoid). If there is voltage but no click, the lock is bad. 4) Test the door lock for continuity (multimeter required) - Unplug the washer and disconnect the lock assembly connector. - Set a multimeter to resistance/continuity and check the switch terminals. A typical lock will show continuity on specific terminal pairs when unlocked vs locked (refer to wiring diagram). No continuity or open circuits indicate a failed interlock. 5) Remove and replace the door lock assembly - Tools: Phillips screwdriver, trim tool, socket set, multimeter, replacement lock assembly. - Steps: a. Unplug the washer. b. Open the washer door and remove the retaining band/clamp (spring or clamp) to peel the door boot back enough to access the lock, or remove the top/front panel per your model if easier. c. Remove the screws securing the lock assembly to the front panel. d. Unplug the wiring connector from the lock assembly and remove the old unit. e. Install the new lock: connect wiring harness, seat the lock in its mounting, and secure with screws. f. Re-seat the door boot and reinstall the clamp or reattach the panel. g. Plug in the washer and run a short cycle to verify proper locking and operation. 6) Additional checks if replacement didn't fix it - Inspect the wiring harness for damaged wires or loose connectors between the control board and the lock. - Test the control board outputs — if the board does not send voltage to the lock, the control board may be faulty. - Check door strike alignment: if the lock solenoid cannot physically engage, adjust or replace the strike or door seal. Safety note: Always unplug the washer before doing any internal diagnostics or repairs to avoid electrical shock. When testing live voltage only do so with one hand and proper insulated tools, or ask a professional if you are not confident working with live circuits.
Common Symptoms
Washer won't start or begin cycle, door error codes/display messages, washer stuck showing "door locked" or won't unlock, no click when starting a cycle, occasional intermittent locking.
Common Causes
- Failed door lock/interlock solenoid or internal microswitch
- Damaged door boot, latch or strike preventing engagement
- Wiring harness or connector fault between lock and control board
- Control board not sending locking voltage (rare)
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at ProsourceParts.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Listen for the lock's click when starting a cycle. If you hear the click but the door still reports open or won't lock, the microswitch inside the lock is likely failing; test continuity on the lock assembly to confirm.
Frequently Asked Questions
How do I know if the door lock or the control board is bad?
First check whether the lock receives voltage when the washer tries to start. If you see the expected voltage pulse at the lock connector but the lock does not click or show continuity, the lock is bad. If the lock gets no voltage at all and wiring/connectors are intact, the control board may be failing to send the signal. Verify wiring continuity between the control board and lock before replacing the control board.
Can I run the washer if the door lock is intermittent?
No — intermittent locks can cause mid-cycle unlocks, water spills, or the washer refusing to run. It's unsafe and can damage the machine. Replace a failing lock assembly promptly. If you need a temporary test, you can try starting the washer with the service diagnostics (if available) but do not rely on a faulty lock for normal use.
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