The short answer
On a LG dishwasher, food still on the load at the end of a cycle usually comes down to a blocked filter stack rather than anything deeper in the machine: every modern dishwasher recirculates its wash water through a filter, and once that filter is blind the pump moves far less water than the cycle expects. That keeps it an owner check first, not a service call. Start here: read the code on the panel first, because LG separates the motor inverter from the main board and the code tells you which one you are looking at.
What you are seeing
- Food still stuck to plates on one rack while the other rack is clean
- A gritty deposit on glassware and in the bottom of cups
- A white film on glasses that does not rinse off
- Not this fault: Water on the kitchen floor after a cycle, which is a leak and not a wash fault
- Not this fault: A machine that fills and immediately drains without washing, which is a control or float fault
- Body: LG builds this dishwasher as a direct-drive brushless wash motor with its own inverter board separate from the main board, a base-pan leak sensor and a single-piece door gasket with a lower door seal. That architecture decides which of these you see first.
- Also check note: If these fit better, the fault is a different one.
Likely causes, in order
- A blocked filter stack — Why this rank: The LG filter unthreads as one cylinder with a fine screen behind it, and the screen is what actually blocks.
- A blocked or unseated spray arm — Why this rank: LG's direct-drive wash motor holds pressure well, so an underperforming LG is nearly always an arm or a filter rather than a pump.
- Incoming water not hot enough — Why this rank: LG heats in-line in the wash circuit, so a cold supply makes the machine spend the cycle catching up.
- Load layout shadowing the spray — Why this rank: A large flat item in the wrong place blocks the spray for everything behind it, and the machine has no way to know.
- Detergent released at the wrong time — Why this rank: A dispenser flap that opens against a rack dumps detergent into the pre-rinse, so the main wash runs on nothing.
- Body: Ranked for a LG dishwasher specifically.
What to check, in order
- Body: The order follows the ranking, and the ranking follows the platform. First: unthread the filter and hold the fine screen to a light. It goes first because the LG filter unthreads as one cylinder with a fine screen behind it, and the screen is what actually blocks. Second: spin each arm by hand and run water through its jets at a tap. With the first check clean, this is what the LG platform makes next most likely. Third: run the kitchen tap hot before starting the machine. Only after those three is it worth reaching for load layout shadowing the spray: it costs more to get at, and it does not explain the first three coming back clean.
Checks you can make
- Note the exact code the panel shows before you cancel it, then cancel and run a short cycle to see whether it returns at the same point. A code that returns at the same stage is a component, not a glitch. — Tools: none — Time: about thirty minutes
- Take out the lower rack, unthread the filter assembly and lift out the fine screen behind it. Rinse both under a running tap until light passes evenly through the mesh, then refit and lock the cylinder. — Tools: none — Time: about ten minutes
- Lift each spray arm off its mount, run water through it at the tap and check that every jet passes water. Refit each arm and spin it by hand to confirm it turns freely through a full rotation. — Tools: none — Time: about fifteen minutes
- Body: Stop at the first step that would need a meter on live terminals or a sealed assembly opened.
Before you open anything
Safety
Switch the machine off at its breaker, or unplug it, before removing any panel. Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. Work with the floor dry and stand on something dry. Water on the floor is part of the electrical hazard, not separate from it.
When to call
The line is not difficulty, it is what the next step costs and risks. Call when: the wash arms turn freely, the filter is clear and the load is still coming out dirty the wash pump note has changed and the top rack no longer gets wet
Nearest pages
What this page omits
This is generalized information: it ranks causes for the LG dishwasher range as one platform, not for a single model. Where a page exists for your specific model it is the more specific one and takes precedence over this. The narrower pages below cover the other presentations of this symptom.
Entries: - [LG Dishwasher: Cycle Will Not Run or Complete](/blog/lg-dishwasher-cycle-fault) - [LG Dishwasher: Not Heating](/blog/lg-dishwasher-heating-failure) - [LG Dishwasher: Door, Latch or Seal Fault](/blog/lg-dishwasher-door-seal)
Lead Appliance Repair Technician · 12 years experience
Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
