The short answer
On a LG dishwasher, a cycle that never reaches the end usually comes down to water in the base pan tripping the leak float rather than anything deeper in the machine: once the float lifts, the machine latches into a protective state and runs its drain pump instead of starting a cycle. 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
- A cycle that stops at the same stage every time
- A machine that keeps refilling or keeps draining without advancing
- A cycle that runs far longer than its stated time and then aborts
- A code appearing part way through rather than at the start
- Not this fault: A machine that will not start at all, which is a latch or supply 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
- Water in the base pan tripping the leak float — Why this rank: The LG leak sensor floats in the base pan and latches the machine into a continuous drain, which owners hear as a pump that never stops.
- The fault the panel is already reporting — Why this rank: A machine that is showing a code or a blink pattern has already told you where to look, and reading it costs nothing.
- A blocked filter stack — Why this rank: LG's filter stack unthreads as one cylinder and the fine screen behind it is what actually blocks.
- A jammed drain pump — Why this rank: The drain pump stalls on debris rather than burning out.
- Incoming water not hot enough — Why this rank: Detergent needs heat to work, and a machine fed from a long cold run starts every cycle behind.
- 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: listen for a drain pump running with nothing selected. It goes first because the LG leak sensor floats in the base pan and latches the machine into a continuous drain, which owners hear as a pump that never stops. Second: count the pattern from a cold start before cancelling anything. With the first check clean, this is what the LG platform makes next most likely. Third: unthread the filter and hold the fine screen to a light. Only after those three is it worth reaching for a jammed drain pump: 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
- Write down the exact code or blink pattern and the point in the cycle at which it appeared, before cancelling anything. Cleared without being read, it is gone. — Tools: pen and paper — Time: about ten minutes
- Unthread the filter cylinder, lift out the fine screen behind it and rinse both under a tap until light passes through the mesh evenly. — Tools: none — Time: about ten minutes
- Run the cycle and write down exactly where it stops, using the panel indication and the sound of the machine. A fault that always stops at the same stage has told you what it is failing at. — Tools: pen and paper — Time: one cycle
- 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. Never defeat a door interlock or bypass a switch to make a machine run so you can watch it. The interlock is the only thing standing between the cycle and your hands.
When to call
The line is not difficulty, it is what the next step costs and risks. Call when: the cycle aborts at the same stage with the sump, filter and drain all proven clear a code returns immediately after a reset
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: Does Not Clean or Dry](/blog/lg-dishwasher-cleaning-performance) - [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.
