LG LDS5811ST-02 Dishwasher Drain Pump – What Part Fixes This Problem?
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Understanding the Problem
The drain pump in the LG LDS5811ST-02 removes wash water at the end of cycles. When it fails or is blocked you’ll get standing water, buzzing or humming from the base, OE/Drain error codes, or the dishwasher will time out without draining. Below are practical diagnostics and repair steps you can follow to confirm and fix the drain pump. Note: part numbers for LG pumps can vary by production run — always confirm the replacement part against your model and serial from the tag on the door jamb. 1) Preliminary checks (fast, non-invasive) 1. Turn off power to the dishwasher at the breaker and confirm power is off. 2. Remove the bottom dish rack and check the filter/sump area for debris (glass, food, labels). Remove visible obstructions. 3. Inspect the drain hose behind the dishwasher for kinks or clogs. Disconnect the hose at the sink drain (or air gap) and check for blockages; blow through it or run water to confirm flow. 4. Run a quick drain cycle (after reconnecting) to listen: a healthy pump runs and moves water; a failed pump is silent, hums, or trips a breaker. 2) Diagnose the drain pump electrically and mechanically 1. Remove the kickplate/toe panel at the bottom front to access the pump area. Keep the power off. 2. Locate the drain pump motor at the base (connected to sump). Visually inspect wiring harness and connectors for burn, looseness, or corrosion. 3. With a multimeter set to ohms, disconnect the pump wiring and measure coil resistance across pump terminals. Typical small dishwasher pump motors read a low resistance (tens to hundreds of ohms). An open/infinite reading indicates a failed motor. A short to chassis (continuity to ground) indicates internal failure. 4. If the pump hums but does not spin, it often indicates a seized impeller or failed start winding — remove the pump to check for trapped debris or broken plastic impeller. 3) Remove and replace the drain pump (how-to) Tools: Phillips screwdriver, flat screwdriver, nut driver (1/4" or 5/16"), pliers, multimeter, bucket/towels. 1. Power: Turn off power at the breaker and shut off water if you plan to disconnect plumbing. 2. Access: Pull dishwasher out from under the counter enough to access the rear drain hose and front kickplate. Place towels to catch water. 3. Disconnect: Remove the lower access panel. Place a shallow pan under the pump to catch water. Disconnect the wiring harness to the pump and remove the drain hose clamp; detach the hose. 4. Unmount: Remove the screws or clips holding the pump assembly to the sump/housing. Lower the pump; be prepared for some trapped water. 5. Inspect: Check impeller for damage, debris, or seizure. If debris is present, clean thoroughly and try a run before replacing. If impeller or motor is damaged, replace the pump. 6. Replace: Install the new pump into the sump, secure fasteners, reconnect the drain hose and wiring harness. Make sure gaskets/seals are seated properly to prevent leaks. 7. Test: Restore power and run a drain cycle with some water in the tub. Verify pumping action, no loud grinding, and no leaks. 4) Final steps and verification 1. Reinstall kickplate and slide dishwasher back into place. 2. Confirm proper operation through a full cycle. Check underside for leaks while running. Safety note: Always disconnect electrical power at the breaker before accessing internal components. If you are uncomfortable working with plumbing or electrical components, hire a qualified appliance technician.
Common Symptoms
Water remaining in the tub after cycle, OE/Drain error code, buzzing or humming from the base, no pump noise, slow or intermittent draining.
Common Causes
- Clogged filter/sump or foreign object jamming the pump impeller
- Blocked or kinked drain hose or air gap
- Failed drain pump motor (electrical winding open or shorted)
- Faulty control board or wiring preventing pump from receiving 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 ProsourceParts.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
If the pump hums but nothing drains, check for trapped debris around the impeller and test the pump motor with a multimeter; a humming motor + open impeller usually means a seized impeller or bad start winding — replacement is required.
Frequently Asked Questions
How can I tell for sure the drain pump is bad?
After clearing the filter and checking the drain hose, remove the kickplate and disconnect the pump wiring. Measure resistance across the pump motor terminals with a multimeter — an open circuit indicates a bad motor. Also, if you hear a humming noise but the impeller does not spin, the pump is likely seized or electrically failed. If unsure, swap with a known-good pump or have a tech confirm.
Can I replace the drain pump myself, and how long will it take?
Yes — a homeowner with basic tools and comfort with disconnecting the dishwasher can replace the pump. Expect 45–90 minutes: power off, pull unit forward, remove kickplate, drain/disconnect hoses, unbolt old pump, install new pump, reconnect, and test. If you’re not comfortable with electrical testing or plumbing connections, call a technician.
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