- “The filter in the sump floor is the answer more often than the pump”
- “OE is the code, and LG's own order goes from free to expensive”
- “A pump that hums is blocked; a pump that is silent has failed”
Symptom
LG dishwasher not draining
The most common dishwasher call there is, and the cheapest cause is also the most likely. Everything the machine washes off the plates that does not leave through the drain stays in the sump, and the filter there is what catches it. A filter nobody has taken out in two years will stop a perfectly healthy pump.
- From $95 diagnostic, credited to the repair
- 59 cities and neighborhoods covered
- OEM parts available on order
- In writing the price, before anything is opened
Four ordinary causes
What this usually turns out to be
Cheapest and commonest first, which is also the order we check them in. They sit hundreds of dollars apart, and only the unit settles which one is yours.
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A loaded filter
The commonest cause by a wide margin, and free to put right.
Dishwasher drain repair from $135 -
A kinked or blocked drain hose
Usually crushed when the machine was pushed back into its opening.
Dishwasher drain repair from $135 -
The disposal knockout still in place
A new disposal ships with the dishwasher spigot blanked off. If nobody removed it, the machine has never had anywhere to drain.
Dishwasher drain repair from $135 -
The drain pump
Last on the list and genuinely uncommon. It is diagnosed by sound before it is diagnosed by price.
Dishwasher pump replacement from $215
In five minutes
Before you call anybody
None of it needs tools, and all of it makes the visit shorter.
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01
Scoop the water out and find the filter
It is a cylinder in the middle of the tub floor and it twists out by hand.
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02
Run a rinse and listen
A humming pump with no flow is blocked. Silence at the same moment is a failed pump or its supply.
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03
Look under the sink
Follow the corrugated hose from the machine to the sink. A high loop or an air gap should be there, and a kink usually is.
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04
Check the sink drains freely
A blocked kitchen waste will back up into the dishwasher and look like an appliance problem.
How it shows up
What people describe when they call
A shortcut
Narrow it down before anybody arrives
A description of the behaviour leaves a few possible causes. A code names the subsystem before anybody opens anything, which is why it is worth photographing before it clears.
If there is no code at all
On a dishwasher, the data plate is on the edge of the door — open it and look along the top or the side. All models
In more detail
About LG dishwasher not draining
Ten minutes with a bowl and a cloth
Scoop the standing water out with a cup so you can see the bottom. Take out the lower rack, twist the filter cylinder anticlockwise and lift it out with the flat mesh plate under it. Rinse both under the tap with a brush, look in the sump for glass or a bone, and put them back. Then check the drain hose behind the machine for a kink. That sequence answers most of these before anybody is called.
What it usually means, by the kind of LG appliance
LG sells one appliance in several forms — five shapes of washer, three kinds of dryer, four fuels of range — and the same behavior points at different things on each of them. A built-in side-by-side and an integrated column are not the same service situation, and a dual-fuel range and an induction range fail in different halves.
- Front control — The filter is under the lower spray arm and twists out by hand. No tools.
- Top control — Same filter, same place. The control layout makes no difference to this.
- With a disposal — Check the knockout plug was punched out when the machine was installed. A machine that has never drained properly since day one is usually this.
Where the water actually goes
A dishwasher does not have a drain of its own. It pumps into the kitchen waste, usually through a hose that loops up under the worktop or through an air gap on the sink, and joins the sink drain or a disposal spigot. That means three separate things can stop it: the machine, the hose, or the plumbing it shares with the sink. Checking whether the sink itself drains freely is a thirty-second test that saves a wasted call.
Why the filter matters more than people think
Modern dishwashers use very little water, and the filter is what keeps what they do use clean enough to reuse through the cycle. Everything that comes off the plates ends up there. Five minutes twice a year is the best-value maintenance in the kitchen, and skipping it is the single largest cause of both poor cleaning and no draining on every make we work on.
This article is based on:
- Official manufacturer documentation
- Internal repair procedures
- Technician repair history
- Company quality standards
Before you book
Questions about LG dishwasher not draining
There is always a little water in the bottom.
A small amount in the sump is normal and by design — it keeps the seals wet. What is not normal is water standing above the filter, water you can see without moving anything, or water that has gone cloudy and started to smell. Those are drainage.
It drains but very slowly.
Same list, earlier in its progress. A partly blocked filter or a partly kinked hose gives exactly this, and it is much easier to fix now than after it stops entirely.
Where we do it
Across Miami-Dade, Broward, and Palm Beach
Same terms everywhere we go: an on-site diagnostic first, the price agreed in writing, and the exact figure confirmed once we have seen the unit.
Neighborhoods people ask for by name