Last updated: 2026-10-30 · By Fix It or Replace editorial team

LG Dishwasher Not Cleaning? Filter, Spray Arm and Loading Fixes, Codes, Costs and Repair vs Replace (2026)

Verdict at a glance

Safety check before any DIY (30 seconds)

Stop and don't start the DIY steps below if any of these is true:

• Water is on the floor or near the outlet or wiring box under the sink. Switch off the dishwasher's circuit breaker before you touch anything (LG's AE / E1 code means a leak was detected).
• You smell burning, see smoke or melted plastic, or the breaker trips. Leave it off at the breaker and call a technician.
• You just ran a hot cycle. The water, the filter, and the heater area can be hot. Let it cool before you reach in.
• The dishwasher is still under warranty (year 1, or year 2 on some LG models). Use LG's warranty service before you open any panels (see the warranty section below).
• Recall check: search your model on the CPSC recall site before paying for a repair.

If none of these apply, the free checks below are safe for most owners. Watch for broken glass in the filter area.

Fix order at a glance (cheapest first)

DIY tiers: Easy (no panels off) · Moderate (a panel off, power and water off) · Advanced (wiring connectors or several parts) · Pro only (mains wiring, or still under warranty).

Which LG dishwasher do you have?

Find the model and serial number on the label on the side edge of the inner door or the tub opening (open the door and look along the edge). You need it to order the right filter or spray arm and to check warranty status.

Model prefixes are examples, not a full list. Your owner's manual (search your model on LG's support site) has the exact filter and spray-arm layout.

Five-minute checks before you call anyone

LG's own troubleshooting for food soil left on dishes, plus what each step means:

1. Look at the dishes, not just "dirty." Food bits usually mean the filter or spray arms. A white or cloudy film usually means detergent or water hardness (see "Cloudy glasses" below). Gray or black marks usually mean aluminum items rubbing other dishes (LG's manual says to reposition them). Yellow or brown film inside the tub usually means coffee or tea stains; LG suggests a stain-removal product.
2. Check the cycle. LG's manual lists the wrong cycle for the soil level as a cause. A quick or eco cycle won't remove baked-on food.
3. Check the water temperature. LG lists water that's too cool as a cause and says to check the water supply connection or the water heater setting. Before you start, run the kitchen hot tap until it's hot so the dishwasher fills with hot water from the first fill.
4. Check the water supply. LG says inlet pressure should be between 20 and 120 psi. Make sure the valve under the sink is fully open and the inlet hose isn't kinked or crushed.
5. Check you used detergent and that the detergent door opened. LG lists no detergent as a cause, and dishes or utensils can block the dispenser door from opening.
6. Spin each spray arm by hand. LG's manual says that when the spray arms don't rotate smoothly, the holes are blocked by food particles. If something in the rack stops an arm, it won't spin at all.
7. Look at the filters (next section). This is the single most common fix.

How to clean LG dishwasher filters (10 minutes)

LG's manual describes a multi-part filter system (a mesh filter, an upper filter, and an outer filter on many models) and says to clean the filters after each load for best results, and at least monthly if you have hard water. LG's help page adds that an incorrectly installed filter lowers wash performance, and that a neglected filter can cause odor.

You'll need: gloves, a soft brush, and a towel. Watch for broken glass.

1. Turn off the dishwasher and let it cool if it just ran.
2. Pull out the lower rack.
3. Turn the filter assembly counterclockwise and lift it out.
4. Separate the parts as your manual shows (on many models the upper filter lifts out of the outer filter).
5. Rinse under running water. LG warns not to scrub with excessive force; a soft brush is enough for the mesh.
6. Wipe out the sump area under the filter. Remove any glass, bones, seeds, or labels.
7. Reinstall in reverse order and turn the filter clockwise until it locks. A filter that isn't fully seated lets debris recirculate onto dishes.
8. Run a normal cycle with a load you can judge.

How to know it's fixed: dishes come out without food bits on the next two or three loads, glasses aren't gritty, and the filter isn't packed with debris after a normal load.

How to clean LG spray arms (10–15 minutes)

LG's spray-arm maintenance guide covers three arms: lower, upper, and top.

1. Lower spray arm: pull it straight up to remove it.
2. Upper spray arm: turn the retaining nut counterclockwise and pull the arm down. Don't lose the small pin or nut; the arm won't seat correctly without it (the retainer is a cheap replacement part if you lose it).
3. Top spray arm (on models that have one): remove it as your manual shows.
4. Clear each nozzle hole with a toothpick or pin. Don't enlarge or scratch the holes.
5. Flush each arm with hot water and shake it to get loosened debris out of the inside.
6. Reinstall and spin each arm by hand. It should turn freely and not hit any rack, tall pan, or utensil.

How to know it's fixed: each arm spins with a light push, the holes are clear when you hold the arm to the light, and the rack that was dirty now comes out clean.

Loading and detergent: the free fixes LG emphasizes

LG's help page on dishes that aren't getting clean puts loading and detergent right next to the filter:

• Scrape large scraps and soak burnt-on food. LG suggests soaking burnt pots for about an hour before washing.
• Plates stand upright; bowls and curved items face down. Items that face up collect dirty water. Don't nest or overlap dishes.
• Nothing touches or blocks a spray arm. Tall pans, cutting boards, or long utensils that stop an arm will leave a whole rack dirty.
• Nothing blocks the detergent door.
• Use a high-performance detergent. LG says liquid detergent isn't recommended for best results; use quality pods, tablets, or powder.
• Use rinse aid. LG's manual recommends it for spotting and for drying, and for cloudiness with soft water.
• Check what you're washing. LG lists dishware that isn't suitable for a dishwasher (for example some wooden, hand-painted, or non-heat-resistant items). Those won't come out well no matter what.

Cloudy glasses or a white film

LG's manual says cloudiness on glassware usually comes from too much detergent combined with soft water. The fix is less detergent plus rinse aid. A gritty, sandy feel on the other hand usually means the filter is clogged and food particles are being sprayed back on the dishes, so clean the filter first.

LG dishwasher codes that affect cleaning

Most cleaning problems show no code. When there is one, these are the ones that matter. LG's US guide says many of these need a technician; it also says codes and features can differ by model.

Which part each code points at, and how hard the fix is:

Code meanings from LG's US error-code guide and owner's manual (sources 1 and 4) and, for nE, LG Spain's code index (source 6), cross-checked 2026-10-30 against the open ApplianceDB sample, which maps each code to a component, a ranked fix, and a DIY difficulty (source 10). Codes vary by model; your owner's manual has the final list.

Diagnose by symptom → likely part

1. Grit or food bits on everything, filter was packed

Likely causes: a clogged or cracked filter that lets food recirculate, or a filter that wasn't locked in.

Signs: sandy residue on glasses; food bits on the top rack; odor.

DIY difficulty: Easy.

Call a pro if: the filter area keeps filling with water (that's a drain problem, see OE).

2. One rack is always dirty, the other is fine

Likely causes: a blocked or cracked spray arm, a missing upper spray-arm nut or pin, the spray-arm manifold (the tube feeding the upper arm) not seating, or a diverter (Vario) motor that isn't switching water between arms (nE).

Signs: the arm doesn't spin by hand; dishes block it; an arm wobbles or sits crooked.

DIY difficulty: Easy for arms and nuts; advanced for the diverter motor (it's under the tub on most models).

Call a pro if: the arms and holes are clean, the arm spins, and one rack still stays dirty, or nE returns.

3. Weak spray, quiet wash, or LE

Likely causes: a failing wash (circulation) motor / pump, or a clogged pump inlet.

Signs: you don't hear the usual water sounds; dishes look "rinsed, not washed"; LE appears.

DIY difficulty: Pro only while LG's warranty might apply; otherwise advanced (the dishwasher usually comes out).

Call a pro if: you see LE or the wash is weak with clean filters. Ask about LG's 10-year Direct Drive motor parts warranty first; you'd still pay labor after year 1 (or year 2).

4. Greasy film, dishes cold at the end, HE or tE

Likely causes: a failed heater, a thermistor fault, or the house water arriving too cool.

Signs: dishes and tub feel cool after the cycle; grease isn't cut; HE or tE shows.

DIY difficulty: Pro only. LG says HE and tE need a technician.

5. Low water, short fills, or IE

Likely causes: the valve under the sink partly closed, a kinked inlet hose, low house pressure, or a failing water inlet valve.

Signs: little water in the tub during the wash; IE.

DIY difficulty: Easy for the valve and hose; advanced for the inlet valve.

Keep it cleaning

• Clean the filters often: after each load for best results, and at least monthly with hard water (LG).
• Check the spray arms every month or two and whenever one rack comes out worse.
• Scrape, don't pre-rinse heavily, and soak burnt-on pans.
• Load to keep the arms free, with curved items facing down.
• Use a quality detergent and rinse aid, and adjust the dose for your water.
• Run the hot tap first and pick a heavier cycle for heavy soil.

Related guides

• Samsung dishwasher not draining
• LG washer not spinning
• LG refrigerator not cooling

What LG's warranty covers on a dishwasher

LG's US dishwasher warranty cards (they vary by model; your card or LG's site has yours):

What this means for a cleaning problem: a failed wash motor, heater, diverter, or board in year 1 (or year 2 on 2-year models) is a warranty repair. After that, the Direct Drive motor and the control board may still be covered as parts, so you'd only pay labor. But cleaning the filter, clearing spray arms, loading, and detergent choice are maintenance, not defects. Keep your proof of purchase.

→ Check your model's warranty on LG's site · Schedule an LG repair

Before you pay for any repair: a 4-point check

1. Warranty: year 1 (or 2), plus LG's 5-year board and 10-year Direct Drive motor parts coverage, plus any retailer or credit-card extended protection.
2. Recalls: search your model at the U.S. Consumer Product Safety Commission's recall site: cpsc.gov/Recalls. A recall repair is free.
3. Maintenance first: clean the filters and spray arms and run one well-loaded cycle with good detergent before the visit. Many "not cleaning" calls end there.
4. Written quote: ask for part, labor, and trip fee as separate lines.

What it costs: repair parts and pro service (2026)

Part prices checked 2026-10-30 on Sears PartsDirect public search pages (S1–S5). Pro-cost cells tagged [GUIDE] from G1 (Fixr) and G2 (HomeGuide), re-read 2026-10-30; [GUIDE] figures are national averages, not LG-specific quotes. HomeGuide puts the average dishwasher repair at $100–$300, and Fixr lists "residue on dishes" repairs at $50–$300. Prices change; confirm with your model number.

Tip: clean the filters and spray arms before the technician arrives. If that was the problem, you've saved the trip fee.

Repair vs. replace calculator

1. What's the all-in repair cost? → R = trip/diagnostic fee + part + labor + tax, minus anything LG's warranty (or a recall) covers
2. What does a comparable new dishwasher cost, all-in? → N = unit + installation + haul-away
3. How old is your dishwasher, and how long should it last? → Age and Life (use about 11 years, near the middle of HomeGuide's 8–15-year range, if you don't know)
4. How much have you spent on repairs in the last 2 years? → Past

Step A — Cost ratio: R ÷ N
Step B — Life used: Age ÷ Life
Step C — Repeat-repair check: (R + Past) ÷ N

Repeat-repair rule: if Step C is over 50%, treat it like the bottom-right box: money keeps going into the same machine. And if the part is no longer available for your model, that decides it: replace.

Worked example 1 (illustrative numbers): A 3-year-old LG dishwasher leaves grit on glasses. The filter is packed and the upper spray arm's holes are clogged. R = $0.
→ Not a repair. Clean, reload, and switch detergent.

Worked example 2 (illustrative numbers): A 5-year-old LG dishwasher shows LE. The wash motor is covered as a part under LG's 10-year Direct Drive motor warranty, so you pay only the visit and labor: R = $200; N = $900; no other repairs.
200 ÷ 900 = 22%; life used 5 ÷ 11 = 45%; repeat check 22% → Repair.

Worked example 3 (illustrative numbers): An 11-year-old LG dishwasher needs a heater, and last year it had a control board for $350. R = $300; N = $900.
300 ÷ 900 = 33%; life used 11 ÷ 11 = 100%; repeat check (300 + 350) ÷ 900 = 72% → Replace.

Tips toward replacing: a motor or board on an older unit outside the parts warranties, a second big repair within about 2 years, rust or a leaking tub.
Tips toward repairing: it's a filter, spray arm, diverter, or inlet valve; the dishwasher is in year 1 or 2; or the motor or board is still covered as a part.

Why 50%? It's the common rule of thumb, and the one we use. Some technician checklists draw the line a little higher, at about 60% of a new dishwasher's price, so treat a repair that costs 50–60% of new as a second-quote zone, not an automatic replace. The older the dishwasher, the lower the line should go: once it has used more than half its expected life, the same repair buys fewer years.

Who services LG dishwashers near you

1. LG (warranty or official service). In year 1 (or 2), or when a motor or board might be covered as a part, start with LG.
→ LG US: schedule a repair · LG customer service 1-800-243-0000 (from LG's manual)

2. A partner appliance pro (out of warranty, or a motor, heater, or diverter has failed).
Our call line connects you with an independent appliance repair provider in your area. Tell them the code (if any), that you cleaned the filters and spray arms, and which rack stays dirty; it speeds up the diagnosis.

3. DIY with the right part. Filters, spray arms, and retainers are DIY-friendly. Order by your exact model number.

Questions to ask any technician:

• Did you check the filters, spray arms, and water temperature first?
• Is it the diverter, the wash motor, or the heater? How did you test it?
• Is the part covered under LG's 5-year board or 10-year motor parts warranty?
• Can you split the quote into part, labor, and trip fee?

Optional: is an appliance warranty worth it?

A home warranty (service contract) can cover repairs for a yearly fee plus a per-visit service fee. Read the exclusions carefully: many plans exclude maintenance issues such as clogged filters. A dishwasher that's already broken is usually not covered.

FAQ

Why is my LG dishwasher not cleaning dishes?
Most often it's clogged filters, blocked spray-arm holes, dishes loaded so they block the spray, or the wrong detergent. LG's manual also lists water that's too cool, low inlet pressure, and the wrong cycle.

How often should I clean my LG dishwasher filter?
LG says after each load for the best results, and at least once a month with hard water. Turn it counterclockwise to remove it and clockwise to lock it back in.

Why is there grit or sand on my dishes?
Usually a clogged or unseated filter, so food particles are sprayed back on the dishes. Clean and reseat the filter.

Why are my glasses cloudy after an LG dishwasher cycle?
LG's manual says cloudiness usually comes from too much detergent with soft water. Use less detergent and add rinse aid.

Why is only the top rack dirty?
A blocked upper or top spray arm, a missing upper-arm nut, or a diverter (Vario) problem. Clean the arms first; nE points to the diverter.

What does nE mean on an LG dishwasher?
A problem with the Vario (diverter) system that switches water between spray arms. Make sure nothing blocks the arms, clean the holes, unplug for about a minute, and request service if it returns.

Is liquid detergent bad for LG dishwashers?
LG says liquid detergent isn't recommended for best cleaning results and suggests a high-performance detergent.

Does LG's warranty cover a dishwasher that isn't cleaning?
A failed part in year 1 (or 2 on some models) is covered for parts and labor, and LG covers the Direct Drive motor (up to 10 years) and control board (up to 5 years) as parts only. Filter cleaning and loading are maintenance.

Is it worth fixing an LG dishwasher that doesn't clean?
Usually yes: most fixes are free, and a diverter or inlet valve is a modest part. A motor or board on an older dishwasher outside the parts warranty often isn't. Use the calculator above.

About the author

Fix It or Replace editorial team — We research appliance repairs using manufacturer documentation, parts-supplier data, and current US cost guides, and we cite every source below. We are not appliance technicians; for anything involving wiring you're unsure about, call a qualified pro.
Last updated: 2026-10-30.

Sources

1. LG US Support: "[LG Dishwasher] Guide to Error Codes" (IE water inlet: check outage, hose kinks, inlet valve; OE: clean the filter every one to two weeks, check the outlet hose; tE temperature sensor, HE heater, LE cleaning motor: request service; codes differ by model). https://www.lg.com/us/support/help-library/lg-dishwasher-guide-to-error-codes--20154464775480 (accessed 2026-10-30)
2. LG US Support: "Why Your LG Dishwasher Isn't Cleaning Dishes Well" (large scraps and burnt-on food, overlapping or upward-facing items, dishes touching spray arms, low-performance or liquid detergent, dirty filter or nozzles; soak burnt pots about an hour; high-performance detergent). https://www.lg.com/us/support/help-library/why-your-lg-dishwasher-isnt-cleaning-dishes-well--20155370301554 (accessed 2026-10-30)
3. LG US Support: "Spray Arm Maintenance" (lower, upper, top arms; removal; clear nozzles with a toothpick or pin; flush with hot water; check rotation) and "How To Clean The Filter" (counterclockwise removal, rinse without excessive force, incorrect installation lowers performance, neglected filter causes odor; vinegar tip). https://www.lg.com/us/support/help-library/spray-arm-maintenance--1366644956160 · https://www.lg.com/us/support/help-library/how-to-clean-the-filter--20153082659663 (accessed 2026-10-30)
4. LG US dishwasher owner's manual (filters: clean after each load for best results, at least monthly with hard water; "Food soil remains on dishes" causes incl. improper cycle, low water temperature, no detergent, inlet pressure 20–120 psi, blocked spray-arm holes, improper loading, clogged filters; cloudiness = excess detergent + soft water; codes IE, OE, FE, E1/AE, HE, TE, LE; LG customer service 1-800-243-0000). https://www.lg.com/us/support/products/documents/Owners%20Manual.pdf (accessed 2026-10-30)
5. LG US Support: "Dishes Are Not Clean (Checking Dishware Types)" (dishware not suited to dishwashers). https://www.lg.com/us/support/help-library/dishes-are-not-clean-checking-dishware-types--20155101652263 (accessed 2026-10-30)
6. LG Spain Support: dishwasher error index (nE: spray-arm alignment / distribution problem; check arms are not blocked and holes are clear; unplug 60 seconds; request repair if it persists). https://www.lg.com/es/soporte/guias-y-soluciones/lavavajillas/indice-errores/ (accessed 2026-10-30)
7. LG US dishwasher limited warranty cards: 1-year parts and labor (DSW_1YR) or 2-year parts and labor (DSW_2Y) depending on model; 5-year main control board and racks; 10-year Direct Drive motor; limited lifetime stainless tub and door liner (parts only after the base period). https://www.lg.com/us/PDF/warranty/ha/DSW_1YR.pdf · https://www.lg.com/us/PDF/warranty/ha/DSW_2Y.pdf (accessed 2026-10-30); LG warranty information https://www.lg.com/us/support/warranty
8. LG US spec sheet LDF5678 (3 spray arms: top, upper, lower; QuadWash; Vario Wash; hidden water heater; soil sensor; 3-stage filtration; Machine Clean cycle; warranty lines). https://www.lg.com/us/support/products/documents/LDF5678%20Spec%20Sheet.pdf (accessed 2026-10-30)
9. U.S. Consumer Product Safety Commission: recalls search. https://www.cpsc.gov/Recalls (accessed 2026-10-30)
10. ApplianceDB free developer sample (LG US dishwasher codes with component, ranked fix, and DIY difficulty; used to cross-check sources 1 and 4, incl. bE and nE). Data under the Open Database License (ODbL) v1.0. https://github.com/ApplianceDB/ApplianceDB-public (accessed 2026-10-30)
11. Federal Trade Commission: endorsement and affiliate disclosure guidance. https://www.ftc.gov/business-guidance/resources/ftcs-endorsement-guides-what-people-are-asking
12. Part prices: Sears PartsDirect public search pages, see S-list below (accessed 2026-10-30).
13. Repair cost guides: Fixr (G1) and HomeGuide (G2), see list below (accessed 2026-10-30).

Part price sources (Sears PartsDirect public search results, USD, accessed 2026-10-30; prices change, confirm with your model number):

• S1. Search "lg dishwasher spray arm": upper spray arm 5249DD1001D $38.63; lower spray arm assembly AGB32598301 $52.86; middle spray arm AGB73093001 $54.22; spray-arm manifold AEC74357401 $59.48; spray-arm retainer 4370ED3007C $10.57 (other brands excluded). https://www.searspartsdirect.com/search?q=lg%20dishwasher%20spray%20arm
• S2. Search "lg dishwasher filter": lower filter MDJ62185601 $5.94; coarse filters ADQ73234005 $41.05, MDJ64544301 $66.48; filter retainer 4930DD3002A $10.57 (noise filters and other brands excluded). https://www.searspartsdirect.com/search?q=lg%20dishwasher%20filter
• S3. Searches "lg dishwasher circulation pump" and "lg dishwasher wash motor": pump and motor assembly AGM30016301 $98.83; pump motors 4681ED1004B $203.42, 4681ED1004E $215.30; circulation pump ABT72989205 $277.53; pump and motor assembly ABT72989201 $313.79; electronic control board assembly AGM76889607 $404.65 (other brands excluded). https://www.searspartsdirect.com/search?q=lg%20dishwasher%20circulation%20pump · https://www.searspartsdirect.com/search?q=lg%20dishwasher%20wash%20motor
• S4. Search "lg dishwasher water inlet valve": 5221DD1001F $63.45; 5221DD1001E $99.76; AJU33450703 $132.46 (other brands excluded). https://www.searspartsdirect.com/search?q=lg%20dishwasher%20water%20inlet%20valve
• S5. Search "lg dishwasher diverter": diverter motor 4681ED3001D $48.07; diverter position switch EBF64375202 $25.23; diverter cam MBJ32856401 $10.57 (other brands excluded). https://www.searspartsdirect.com/search?q=lg%20dishwasher%20diverter

Pro-cost guide sources [GUIDE] (US national averages, parts + labor, not brand-specific quotes; the guide pages carry 2023–2025 dates, so local quotes may differ):

• G1. Fixr, "Dishwasher repair cost" (updated January 31, 2025): residue on dishes $50–$300; filter $50–$125; inlet valve $75–$150; spray arm $75–$150; heating element $150–$300; control panel $200–$500; motor $400–$600; diagnostic fee $50–$75; labor $50–$100 per hour; new dishwasher $400–$700 plus $100–$300 installation. https://www.fixr.com/costs/dishwasher-repair (accessed 2026-10-30)
• G2. HomeGuide, "Dishwasher repair cost" (byline December 22, 2023): average repair $100–$300; minimum service fee $70–$130 including the first hour, then $50–$125 per hour; replace heating element $200–$350; replace motor $350–$500; replace water inlet valve $80–$170; control board $200–$600; replace filter $90–$175; replace sprayer arm $80–$200; dishwashers last 8–15 years; replacement $600–$1,700. https://homeguide.com/costs/dishwasher-repair-cost (accessed 2026-10-30)

Disclosure

Fix It or Replace is an independent site. We are not affiliated with, endorsed by, or sponsored by LG. "LG" and "QuadWash" are trademarks of their owner and are used here only to describe the products we cover.

• Affiliate links: Some part links go to retailers such as PartSelect and RepairClinic. If you buy through them, we may earn a commission at no extra cost to you.
• Call line: Phone numbers labeled "partner pro" are operated by a third-party lead service that routes your call to an independent repair provider in your area. We may be paid for calls. We don't employ the technicians, and we don't guarantee their work, pricing, or availability. Confirm licensing, insurance, and quotes directly with the provider.
• Prices are estimates and change often. Always get a written quote.
• Safety: Turn off power to the dishwasher before working on it. Watch for broken glass in the filter area. If you're unsure, call a qualified professional.

We don't publish fake reviews or testimonials, and we never present a tracking phone number as a specific local business.