LG WM21 Washer Won't Drain or Spin – What Part Fixes This Problem?
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Understanding the Problem
If your LG WM21 washer fills and washes but refuses to drain or spin, it usually means the machine can't remove water from the tub or can't reach the required spin speed. That prevents the cycle from progressing and leaves clothes soaking wet. The washer may show an error code, make humming noises, or simply stop at the drain/spin portion of the cycle. Identifying whether the problem is mechanical (pump, hose, motor) or electronic (control board, door lock) will save time and money. Begin with simple checks: look for visible clogs in the drain hose or pump filter, confirm the drain pump runs during the drain portion of the cycle, and note any error codes shown on the display. Typical repair items are a clogged or failed drain pump, blocked drain hose, faulty door lock/interlock, or a drive/motor problem. Less commonly, the main control board or a failed tach/encoder on the motor can prevent spin/drain operations.
Common Symptoms
Washer stops at drain/spin, water remains in drum, loud humming from front, error codes during drain (or no code), clothes come out very wet.
Common Causes
- Clogged Drain Pump or Pump Filter (debris, lint, coins, small items)
- Blocked or kinked drain hose or drain plumbing
- Failed drain pump motor (impeller stuck or burnt motor)
- Faulty door lock/interlock preventing spin/drain cycle start
- Drive motor, motor coupling, or motor control (inverter) fault
- Control board or sensor (water level/pressure switch) failure
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
During a drain cycle, listen at the front for the pump running and feel the drain hose—no sound or movement usually indicates a failed or blocked drain pump; if the pump hums but doesn’t pump, the impeller or pump is likely bad.
Frequently Asked Questions
How do I check if the drain pump is clogged or failed?
Unplug the washer, access the pump/filter area (front lower panel or rear depending on model), and remove any visible debris from the filter or inlet. If debris is clear, run a short drain cycle with the panel off (plug the washer back in) and listen: pump should run and produce suction at the inlet. If it’s silent or only hums without pumping, the pump motor or impeller is likely faulty and usually needs replacement.
Can I replace the drain pump or door lock myself and how much does it cost?
Yes — if you are comfortable with basic appliance repair (unplugging the unit, removing a front or rear access panel, and swapping connectors and hoses), you can replace the drain pump or door lock yourself. Parts cost varies: a drain pump commonly ranges $40–$120, a door lock assembly $40–$100. Add tools/time; if you’re not confident, a pro will usually diagnose and replace parts safely and may cost more but includes warranty.
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Whether your dishwasher won't drain, your dryer stopped heating, or your fridge isn't cold, we've created simple repair guides for the most common appliance problems homeowners face. Each guide explains what's going wrong, the most likely causes, and which replacement parts fix the issue. When you're ready to order, we link directly to ProsourceParts.com where you can search by model number and get the right part shipped fast.