LG LDF6920ST Doesn’t Drain — What Part Fixes This Problem?
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Understanding the Problem
If your LG LDF6920ST finishes a cycle but water remains in the tub, the problem is almost always in the dishwasher’s drainage path — either a clogged line, a failed drain pump, or a blocked disposal/air gap. LG models display OE (or 1E) type codes for drainage faults, but you may also see normal cycles with standing water or slow draining between cycles. Start with the simplest checks: clear any debris from the filter and sump, inspect the drain hose and garbage disposal connection, and listen for the drain pump during a drain cycle. If the pump hums but no water moves, the impeller is likely damaged or the pump is electrically failing. If the pump makes no noise and the control attempts to run it, the pump or its wiring/board may be at fault.
Common Symptoms
Water left in the tub after cycle, slow or no draining, OE/1E drain error code, gurgling sounds, dishwasher cycles but ends with standing water.
Common Causes
- Clogged filter, sump or drain hose (food debris, broken glass, or hard-water build-up)
- Faulty drain pump or clogged pump impeller
- Blocked connection to garbage disposal or clogged air gap/check valve
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 cycle (or select Rinse/Drain) and listen near the base of the machine for the pump motor. If you hear whirring/water movement the problem is downstream (hose/disposal); if there’s no sound but the control tries to run a drain, suspect the drain pump, wiring, or control board. Also check for OE or 1E error codes—those point to drainage failure.
Frequently Asked Questions
How do I tell if the drain pump is bad or just clogged?
First remove the lower dish rack and the filter/sump cover; clear visible debris and inspect the pump impeller for broken blades or trapped objects. Next, run a drain-only cycle and listen: a working pump will make a distinct motor sound and you’ll hear water moving through the hose. If the pump makes no sound when commanded, test for 120V (US) at the pump connector during a drain cycle — if powered but not running, replace the pump. If powered and running but no water moves, the impeller is likely damaged or the hose/connection is blocked.
Can I replace the drain pump myself or should I call a technician?
If you’re comfortable removing the lower access panel, disconnecting wiring, and replacing a single component, you can replace the drain pump yourself — many owners do. Always unplug the dishwasher and shut off water/power first. However, if the problem involves the main control board, complex wiring diagnostics, or the dishwasher must be lifted to access rear components, it’s safer to call a technician. Also confirm the correct OEM part number for your exact model/serial before ordering.
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