LG Dishwasher: Will Not Drain
The fault is in front of you, and the useful question is which cause is likeliest on this brand. On a LG dishwasher that will not drain, the finding that comes up most often is the drain filter behind the lower access panel, followed by a blocked or fouled sump filter. Water standing in the sump after a finished cycle almost always means the drain path is restricted rather than that the pump has died. That first step is yours to make and it costs nothing; the causes below it stop being owner work quickly.
What you are seeing
- a pool of water covering the sump filter when you open the door at the end of a cycle
- a gurgling or straining noise near the end of the cycle instead of the usual short drain burst
- Not this fault: If the tub is dry but the dishes are wet, this is a drying complaint, not a drainage one
- Body: What you are seeing: a pool of water covering the sump filter when you open the door at the end of a cycle; a gurgling or straining noise near the end of the cycle instead of the usual short drain burst. If the tub is dry but the dishes are wet, this is a drying complaint, not a drainage one.
Ranked causes on a LG dishwasher
- The drain filter behind the lower access panel — Tag: filter — Why: It leads here because this is a filter chamber behind the kick panel packed with coins, hair and lint, which no other badge presents. — Presentation:
- A blocked or fouled sump filter — Tag: filter — Why: It ranks high here because LG puts a serviceable filter in the drain path behind the lower panel. — Presentation: A grey mat of softened food, label paper and grease sitting on the mesh, sometimes with the coarse strainer sitting crooked in its seat.
- A kinked, sagging or blocked drain hose — Tag: drain — Why: It sits at this position because the causes above it are more common, cheaper to check, or both. — Presentation: A hose behind the machine bent hard against the cabinet, or a low loop holding water that never clears.
- A disposer knockout plug that was never removed, or a blocked disposer inlet — Tag: drain — Why: It sits at this position because the causes above it are more common, cheaper to check, or both. — Presentation: A completely dry drain hose at the disposer end and a tub that never empties at all, typical of a recent installation.
- Body: Ranked for a LG dishwasher — the order is the point. First: the drain filter behind the lower access panel. It leads here because this is a filter chamber behind the kick panel packed with coins, hair and lint, which no other badge presents. Second: a blocked or fouled sump filter. It ranks high here because LG puts a serviceable filter in the drain path behind the lower panel. Third: a kinked, sagging or blocked drain hose. It sits at this position because the causes above it are more common, cheaper to check, or both. Fourth: a disposer knockout plug that was never removed, or a blocked disposer inlet. It sits at this position because the causes above it are more common, cheaper to check, or both.
What to check, in order
- The drain filter behind the lower access panel — Reason: It is first because it exists on this platform and not on the others, so nothing else you check can rule it out for you.
- A blocked or fouled sump filter — Reason: It comes second because the drain filter behind the lower access panel either accounts for the fault or, once ruled out, leaves this as the next thing the evidence supports.
- A kinked, sagging or blocked drain hose — Reason: It comes third because a blocked or fouled sump filter either accounts for the fault or, once ruled out, leaves this as the next thing the evidence supports.
- Body: The order below follows the ranking: cheapest and likeliest first. There is a standing rule on this platform: skip the belt-and-transmission thinking entirely — an LG has neither, so the same symptom points to the rotor. First, the drain filter behind the lower access panel. It is first because it exists on this platform and not on the others, so nothing else you check can rule it out for you. Second, a blocked or fouled sump filter. It comes second because the drain filter behind the lower access panel either accounts for the fault or, once ruled out, leaves this as the next thing the evidence supports. Third, a kinked, sagging or blocked drain hose. It comes third because a blocked or fouled sump filter either accounts for the fault or, once ruled out, leaves this as the next thing the evidence supports.
Checks you can make safely
- Open the lower access panel, drain into a shallow tray through the small hose, then unscrew and clear the filter completely — Tools: towels, a shallow tray, a flat screwdriver — Time: twenty minutes to half an hour — Targets: The drain filter behind the lower access panel
- Lift out the coarse strainer and the fine filter beneath it, rinse both under a hot tap until the mesh is visibly open when you hold it to the light, and wipe the seat they sit in — Tools: nothing but hot water and a soft brush — Time: a few minutes — Targets: A blocked or fouled sump filter
- Look behind and beneath the machine at the hose run and free any hard bend; confirm the hose rises to a high loop or an air gap before it drops to the disposer or standpipe — Tools: a torch, and a helper to hold the machine steady if it must be eased forward — Time: a quarter of an hour — Targets: A kinked, sagging or blocked drain hose
- Body: The checks a homeowner can safely make, in the order that eliminates most for least effort. Step one: Open the lower access panel, drain into a shallow tray through the small hose, then unscrew and clear the filter completely. Tools: towels, a shallow tray, a flat screwdriver. Allow twenty minutes to half an hour. Step two: Lift out the coarse strainer and the fine filter beneath it, rinse both under a hot tap until the mesh is visibly open when you hold it to the light, and wipe the seat they sit in. Tools: nothing but hot water and a soft brush. Allow a few minutes. Step three: Look behind and beneath the machine at the hose run and free any hard bend; confirm the hose rises to a high loop or an air gap before it drops to the disposer or standpipe. Tools: a torch, and a helper to hold the machine steady if it must be eased forward. Allow a quarter of an hour. Stop at the first step that would put a meter on live terminals or open a sealed system — that is where owner work ends.
Before you touch anything
Safety
A dishwasher sump holds broken glass and blade fragments you cannot see under grey water. Sponge the water out and work with gloves rather than reaching in blind, and take the power off at the breaker before any panel or the pump inlet is opened. One thing to keep in mind on this platform: direct drive: no belt, no clutch, a rotor turning on the tub shaft — that changes where your hands go. electrical water Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off.
When to stop and call
Call a technician if any of these is true: the drain path is provably clear and the pump still makes no noise at the drain step. Above that line the next measurement is on live terminals or inside a sealed system. the drain path is provably clear and the pump still makes no noise at the drain step
Where the figures come from — No warehouse measurement is quoted here; the only figures on this page are the published safety constants, verbatim: Unplug before service.
General guidance- Unplug before service — Manufacturer service manuals, universally; OSHA 1910.147 for the principle., fetched 2026-09-05
Nearest pages of the same kind — Nearest pages of the same kind: ge-dishwasher-control-fault; whirlpool-dishwasher-cleaning-performance; whirlpool-dishwasher-cleaning-performance-2.
What this page does not cover
Generalized information: this covers the LG dishwasher as a platform, not one model. It carries no model-specific codes, service sequences or part numbers. Other faults on this same machine: lg-dishwasher-control-fault, lg-dishwasher-electrical-safety, lg-dishwasher-wont-start-2. The same fault on other platforms, where it ranks differently: midea-dishwasher-drainage-failure, whirlpool-dishwasher-drainage-failure. Read the model number from the appliance tag before ordering any part — that is the axis this page does not resolve.
Links down: - [LG Dishwasher: Controls, Display or Error Code](/blog/lg-dishwasher-control-fault) - [LG Dishwasher: Electrical, Fire or Gas Hazard](/blog/lg-dishwasher-electrical-safety) - [LG Dishwasher: Will Not Start or No Power](/blog/lg-dishwasher-wont-start-2)
Links across: - [Midea Dishwasher: Will Not Drain](/blog/midea-dishwasher-drainage-failure) - [WHIRLPOOL Dishwasher: Will Not Drain](/blog/whirlpool-dishwasher-drainage-failure)
Related pages — Where a reader on this page usually goes next — other faults on the same LG dishwasher: lg-dishwasher-control-fault; lg-dishwasher-electrical-safety; lg-dishwasher-wont-start-2, and the same fault on another platform: midea-dishwasher-drainage-failure; whirlpool-dishwasher-drainage-failure.
- LG Dishwasher: Controls, Display or Error Code
- LG Dishwasher: Electrical, Fire or Gas Hazard
- LG Dishwasher: Will Not Start or No Power
- Midea Dishwasher: Will Not Drain
- WHIRLPOOL Dishwasher: Will Not Drain
- LG Dishwasher: Controls, Display or Error Code
- LG Dishwasher: Electrical, Fire or Gas Hazard
- LG Dishwasher: Will Not Start or No Power
- Midea Dishwasher: Will Not Drain
- WHIRLPOOL Dishwasher: Will Not Drain
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
