Why Won't My LG Washing Machine Drain?
Pull out and clean the pump filter located behind the small access panel at the bottom-front of the machine — this clears the blockage responsible for most LG drainage failures and should restore normal draining within one cycle (takes about 10 minutes).
Fault description
When your LG washing machine won't drain, you'll typically find the drum still full of water at the end of a cycle, or the machine paused mid-cycle with the door locked. In many cases the control panel will display the OE error code, which is LG's way of signalling that water hasn't been removed within the expected time window.
The drainage system on an LG washing machine involves several components working together: the pump filter, the drain pump motor, the drain hose, and the pressure sensor that tells the machine when the drum is empty. A fault anywhere in this chain can stop the cycle from completing.
The good news is that the majority of drainage faults on LG machines are caused by a blocked filter or kinked hose — both of which you can resolve yourself without any specialist tools.
Causes
- Blocked pump filter — Lint, coins, hair grips, and small items of clothing accumulate in the pump filter over time and restrict water flow. This is by far the most frequent cause of drainage failure on LG washing machines.
- Kinked or blocked drain hose — The corrugated drain hose at the back of the machine can become kinked if the machine has been pushed too close to the wall, or blocked internally with detergent residue. Either condition prevents water from leaving the drum.
- Faulty or obstructed drain pump — Even after the filter is clear, a small object such as a button or piece of wire can jam the pump impeller and stop it spinning. In some cases the pump motor itself fails electrically and will need replacing.
- Blocked household standpipe or waste connection — If the drain hose empties into a standpipe or sink waste, a blockage further down the household plumbing can cause water to back up into the machine. This is easy to overlook because the fault appears to be with the appliance.
- Faulty pressure sensor (water level sensor) — The pressure sensor monitors how much water is in the drum and signals the control board when draining is complete. If the sensor or its connecting air tube is faulty, the machine may believe the drum is still full and refuse to advance the cycle.
- Control board fault — In a small number of cases the main control board fails to send the correct signal to the drain pump. This is relatively rare and is usually only diagnosed after all other causes have been ruled out.
Step-by-Step Fix
- 1
Cancel the cycle and manually drain the drum
Select the Spin or Drain programme on the dial and press Start — this sometimes clears a temporary sensor glitch and allows the machine to drain normally. If the drum remains full, place towels on the floor, open the small access panel at the bottom-front of the machine, and use the emergency drain hose (a short rubber tube clipped inside the panel) to drain the water into a shallow bowl before proceeding.
- 2
Clean the pump filter
With the drum empty, unscrew the large circular filter cap inside the access panel anticlockwise. Pull the filter out and rinse it under a tap, removing all lint, debris, and any foreign objects. Also reach into the filter housing with your fingers and check that the pump impeller (a small plastic fan) spins freely. Refit the filter firmly — a loose filter cap will cause a leak.
- 3
Check the drain hose for kinks and blockages
Pull the machine away from the wall and inspect the full length of the corrugated drain hose. Straighten any kinks and ensure the hose is not compressed behind the appliance. The end of the hose should sit no higher than 100 cm above floor level — if it is too high, the pump cannot overcome the head pressure.
- 4
Check the household standpipe or waste connection
Disconnect the drain hose from the standpipe or sink waste and pour a jug of water directly into the standpipe to confirm it drains freely. If it drains slowly or backs up, the blockage is in your household plumbing rather than the machine, and the pipe will need clearing before the washing machine will drain correctly.
- 5
Inspect the pump impeller for obstructions
If the filter was clear but the pump still makes a humming noise without draining, a foreign object may be jammed in the impeller. With the machine unplugged, remove the filter again and use a torch to look into the housing. Use long-nose pliers to carefully remove any visible obstruction. Do not force the impeller — if it won't turn freely after removing visible debris, the pump may need replacing.
- 6
Reset the machine
Unplug the washing machine from the mains socket, wait 60 seconds, then plug it back in. Select a short Spin cycle and observe whether the machine drains. A power reset can clear a temporary OE error caused by a control board communication glitch, particularly after a power fluctuation.
- 7
Test the pressure sensor air tube
If the machine still won't drain after the steps above, locate the thin plastic air tube that runs from the bottom of the drum up to the pressure sensor on the control panel area. Disconnect both ends and blow through it to confirm it is clear — a blocked or cracked tube gives the sensor a false reading. Reconnect securely or replace the tube if it is split.
When to call a service technician
Call a service technician if the drain pump makes no sound at all when a drain cycle is selected (suggesting an electrical failure of the pump motor or control board), or if the pump hums continuously but water does not move even after the filter and impeller have been confirmed clear. These faults require component testing with a multimeter and, in most cases, a part replacement that involves accessing internal wiring.
You should also seek professional help if water is leaking from around the pump filter housing after you have refitted the filter, or if the OE error code returns immediately after every cycle despite the filter being clean — this pattern can indicate a failing pressure sensor or a control board fault that needs specialist diagnosis.
Prevention
The most effective way to prevent drainage faults on an LG washing machine is to clean the pump filter every one to three months, depending on how frequently you wash. Always check pockets before loading — coins, hair grips, and tissues are the most common causes of pump blockages. Using the correct amount of HE (high-efficiency) detergent also reduces the build-up of residue inside the drain hose over time.
The parts most commonly replaced when an LG washing machine won't drain are the drain pump assembly, the pump filter and housing, and the pressure sensor (also called the water level sensor). Genuine LG parts are recommended to ensure compatibility across the 977+ affected models.
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Frequently Asked Questions
What does the OE error code mean on an LG washing machine?
OE stands for Outlet Error and means the machine has detected that water has not drained within the expected time. It is triggered by the control board when the pressure sensor still registers water in the drum after the drain pump has been running. Clearing the pump filter resolves the OE code in the majority of cases.
Can I use my LG washing machine if it won't drain?
It is best not to continue using the machine until the fault is resolved. Running repeated cycles with standing water in the drum puts extra strain on the pump motor and can cause mould and odour to develop inside the drum and door seal. Address the drainage fault first, then resume normal use.
How often should I clean the pump filter on my LG washing machine?
LG recommends cleaning the pump filter approximately once a month, though every two to three months is sufficient for households that wash less frequently. If you regularly wash pet bedding, heavily soiled items, or items with loose fibres, clean it monthly to prevent build-up.
My LG washing machine drains slowly but does eventually empty — is that a problem?
Slow draining is an early warning sign, usually indicating a partially blocked pump filter or a drain hose that is beginning to restrict flow. Left unattended it will progress to a complete blockage and trigger the OE error. Clean the filter and check the hose routing now to avoid a more disruptive fault later.
How much does it cost to replace the drain pump on an LG washing machine?
A replacement LG drain pump typically costs between £25 and £55 for the part alone, depending on the model. If you are comfortable with basic appliance repair the pump is accessible from the front of most LG machines after removing the lower panel. A service technician call-out will add labour costs on top of the part price.