LG LDF6920ST Not Draining – What Part Fixes This Problem?
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Understanding the Problem
If your LG LDF6920ST finishes a cycle but leaves water in the tub, the problem is most often in the drain path — either a clogged filter/sump, a failed drain pump, or a blocked drain hose/disposal connection. The machine usually attempts to pump water out during the drain and final rinse; when that process fails you may hear unusual noises, no noise at all, or the dishwasher may time out and display an error code. Diagnosis starts with simple, safe checks: remove standing water, inspect and clean the filter and sump area, and verify the drain hose isn't kinked or plugged. If hoses and filters are clear but the unit still won't evacuate water, the next components to inspect are the drain pump assembly and the check/anti-backflow valve. Less commonly, a faulty control board or wiring can prevent the pump from receiving power — these should be tested after mechanical faults are ruled out.
Common Symptoms
Water remains after cycle, dishwasher times out or shows a drain error, gurgling or humming noises from the base, bad odors from standing water, or visible clogs in the filter/sump.
Common Causes
- Clogged filter, food trap, or debris lodged in the sump preventing water from reaching the pump
- Failed or jammed drain pump assembly (impeller seized or motor failed)
- Blocked/kinked drain hose, plugged garbage disposal inlet, or faulty check/anti-backflow valve
- Electrical fault — bad wiring, door switch, or control board preventing the pump from getting power
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 PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
Run a drain-only or diagnostic cycle while listening at the front base of the dishwasher. If you hear a humming or clicking but no water movement, the pump impeller may be jammed or the pump motor failing. No sound at all points to a wiring/control issue or a stopped pump with no power.
Frequently Asked Questions
How do I test if the drain pump is bad?
First remove standing water and clear the filter/sump. Run a drain or diagnostic cycle and listen at the base; a working pump makes a steady hum and you should hear water moving. If there’s no sound, check for voltage at the pump connector with a multimeter when the machine is in a drain step (only if you’re comfortable and have disconnected power before accessing wiring). If the pump hums but doesn't move water, the impeller may be jammed or the pump is weak and needs replacing.
How much does it cost to replace the drain pump on an LG LDF6920ST?
Parts alone typically range from $40–$150 depending on OEM vs aftermarket. Labor for a professional repair usually adds $100–$250 depending on local rates and access. Total DIY cost (parts only) is often under $200; professional repair will vary by region and service fees.
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