LG WM3987HW washer Parts

On the LG WM3987HW washer, CD shown in the LG ThinQ app or on the display typically indicates Child Lock (Control Lock) is turned on. It is a normal safety feature that prevents most buttons from changing the cycle while the washer is running; it is not a part failure.

What you can do when you see CD

• If you want to change settings, turn Child Lock off using the control-panel button combination listed in the WM3987HW user manual.
• If the washer is mid-cycle, pause the cycle first, then disable Child Lock.
• If you are using ThinQ, refresh the app status after changing the setting on the washer.
• If the display returns to normal but buttons still do not respond, power the washer off for 1 minute, then restart.

Quick checks (before assuming anything is wrong)

• Make sure you are not pressing buttons with wet hands (some panels are less responsive).
• Confirm the door is fully closed and latched.
• Verify the control panel is not in a locked state due to a long-press function.

CD vs error codes: what’s the difference?

What you see	What it usually means	Is it a malfunction?
CD	Child Lock is enabled	No
Two-letter error code (varies)	A detected operating issue	Sometimes

For true error-code troubleshooting on LG washers, we use our LG wi-fi front load washer error codes reference as a starting point.

Why it matters

Child Lock helps prevent accidental cycle changes, especially with kids in the home. If you do not realize it is enabled, it can look like the washer controls have failed when they are actually locked by design.

Last updated: January 2026

The LG WM3987HW washer has a 4.2 cu. ft. capacity (often described as “ultra capacity”) for the wash drum. For cycle-specific load guidance and best results in a washer/dryer combo, we recommend following the load size and detergent guidance in the WM3987HW manual.

What “4.2 cu. ft.” means for everyday loads

A 4.2 cu. ft. front-load washer capacity is designed to handle typical family-size loads efficiently, including bulkier items when loaded correctly.

• Wash bulky items (like comforters) one at a time for better balance
• Do not pack items tightly; tumble space improves cleaning and rinsing
• Use HE detergent and measure carefully to reduce oversudsing
• Mix item sizes (small and medium) to help the drum balance during spin
• For best drying performance, avoid overloading before the dry cycle

Quick reference: capacity vs loading tips

Spec	For LG WM3987HW	Practical tip
Washer capacity	4.2 cu. ft.	Leave room at the top so items can tumble
Type	Front-load washer/dryer combo	Smaller loads usually dry faster and more evenly

Why it matters

Capacity affects cleaning, rinsing, spin balance, and drying time. Overloading a washer/dryer combo can lead to poor wash results, longer dry times, and vibration issues.

If you run into out-of-balance spinning, our LG front load washer ue error code guide can help you narrow down common causes.

Last updated: January 2026

Yes, on the LG WM3987HW washer you can typically change the end-of-cycle melody (or turn it off) using the washer’s settings, and on some versions you can also manage sounds through the LG ThinQ app. For the exact button sequence for WM3987HW, use the WM3987HW user manual.

How to change or mute the end-of-cycle sound

Try these common options used on many LG front-load washers:

• Look for a Signal, Beeper, Sound, or Melody setting on the control panel.
• Press and hold the labeled button (often 3 seconds) to toggle sound On/Off.
• If there are multiple volume levels, tap the button to cycle through them.
• If your washer has Wi-Fi, check the LG ThinQ app for sound or “ending melody” options.
• Power the washer off and back on after changing the setting to confirm it saved.

If you do not see a “song” option

On WM3987HW, the ability to load a custom song is not something we can confirm from the model-specific information provided here. Many LG washers only allow you to adjust the signal volume or toggle it on/off rather than downloading new melodies.

Quick check

What you see on the panel	What it usually means
“Signal/Sound” button	You can change volume or turn the chime off
No sound-related button	Sound control may be in a settings menu or not adjustable
Wi-Fi indicator	Sound options may be available in LG ThinQ

Why it matters

Changing the end-of-cycle signal helps you avoid missed loads without needing a loud chime; it is also useful if the washer is near bedrooms or a home office.

Last updated: January 2026

TROMM is an LG branding name used on certain LG washers. For your LG WM3987HW washer, “TROMM” refers to the LG product line, not a separate manufacturer; parts and service information should be matched to model WM3987HW using the WM3987HW manual.

What “TROMM” means on an LG washer

On LG washers, TROMM is typically used as a series or feature label (similar to a product family name). It can appear on the control panel, door, or marketing materials, but the model number is what determines the correct parts and procedures.

• TROMM is an LG line name, not a different brand
• Your exact model number (WM3987HW) is the key for parts compatibility
• Features can vary by model even within the TROMM lineup
• Manuals, wiring, and troubleshooting steps should be model-matched

Why the model number matters for parts

Even if two washers both say “TROMM,” they can use different drain pumps, door locks, or inlet valves. When you are diagnosing a symptom (no drain, won’t fill, door won’t lock), we recommend starting with the model-specific diagrams and procedures in the WM3987HW manual.

Examples of parts that must match the exact model

System	Example part on WM3987HW	What it affects
Draining	Drain pump motor (4681EA2001T) - washer part by LG electronics 4681EA2001T	Won’t drain, slow drain, pump noise
Filling	LG Washer Single-Solenoid Water Inlet Valve 5220FR2006H	No fill, slow fill, fill errors
Door locking	Washer Door Lock Switch EBF49827801	Won’t start, door won’t lock/open

Why it matters

Using “TROMM” alone can lead to the wrong replacement part or the wrong troubleshooting steps. Matching everything to LG model WM3987HW helps ensure proper fit, correct electrical connections, and reliable washer operation.

Last updated: January 2026