Why Does My LG Washing Machine Keep Stopping Before the Cycle Finishes?
Check your home's circuit breaker or fuse for the washing machine circuit, reset it if tripped, then restart the cycle — a power interruption is the most common trigger for the PF error and an incomplete cycle (takes about 5 minutes).
Fault description
When an LG washing machine stops mid-cycle, it can leave clothes sitting in soapy water with no clear explanation. The machine may pause, display an error, or simply go silent. In many cases you'll see the PF error code (Power Failure), which means the appliance detected an interruption to its power supply during the wash. However, incomplete cycles can also occur without any error code at all.
The fault can originate in several different systems — the power supply, the door latch, the water inlet or drain, or the main control board. Because the washing machine's software monitors all of these simultaneously, a problem in any one area can cause the programme to halt as a safety precaution. Understanding which system is responsible is the key to a quick fix.
This guide walks you through the most likely causes in order of probability, with practical checks you can carry out at home before deciding whether a service technician is needed.
Causes
- Power supply interruption — A brief voltage drop, tripped breaker, or loose plug connection can cut power mid-cycle, triggering the PF error code. LG machines log this event and halt the programme rather than continuing in an unknown state.
- Door latch or interlock failure — The machine continuously monitors the door lock throughout a cycle. If the latch mechanism wears or the interlock switch sends an intermittent signal, the machine will stop as a safety measure.
- Water inlet valve fault — If the machine cannot fill to the correct level within a set time — due to a partially blocked or failing inlet valve — it will pause or abandon the cycle. Low household water pressure can produce the same result.
- Drain pump blockage or failure — LG machines must drain successfully between certain stages of a cycle. A blocked pump filter, foreign object in the pump, or a failing pump motor will cause the programme to stall at the drain phase.
- Faulty main control board — The control board coordinates every stage of the wash programme. A failing board can cause random mid-cycle stops, unresponsive controls, or cycles that freeze at the same point every time.
- Overheating motor or thermal cut-out — On heavily loaded or back-to-back cycles, the drive motor can overheat and trigger its built-in thermal protection, pausing the cycle until the motor cools down. This is more common in older machines.
Step-by-Step Fix
- 1
Check the power supply
Go to your consumer unit and look for a tripped breaker on the washing machine circuit. Reset it if needed, then firmly reseat the machine's plug in the wall socket. Avoid using an extension lead — LG washing machines should always be plugged directly into a dedicated wall outlet to prevent voltage drops that cause the PF error.
- 2
Perform a hard reset on the machine
Turn the machine off at the power button, unplug it from the wall, and leave it unplugged for at least 5 minutes. Plug it back in and start a short test cycle such as a rinse-and-spin. This clears any stored fault state and confirms whether the problem is persistent or was a one-off glitch.
- 3
Inspect and test the door latch
Open and firmly close the door, listening for a solid click from the latch. Try pushing the door inward slightly while the cycle is running — if the machine restarts, the latch is not engaging fully. A worn strike plate or a faulty door interlock switch will need to be replaced; both are straightforward spare parts on most LG models.
- 4
Clean the drain pump filter
Locate the small access panel at the bottom front of the machine. Place a shallow tray and towels underneath, then slowly unscrew the filter cap to drain residual water. Remove any lint, coins, or debris from the filter and the pump housing. Refit the cap securely and run a cycle to see if the machine now completes it.
- 5
Check the water inlet and supply pressure
Turn off the water supply and disconnect the inlet hose from the back of the machine. Check the small mesh filter inside the hose connector for limescale or debris and rinse it clean. Also confirm that the tap supplying the machine is fully open and that your household water pressure is adequate — LG recommends a minimum of 0.5 bar.
- 6
Reduce the load and test again
Overloading can cause the motor to overheat and cut out, or prevent the drum from reaching the correct spin speed, causing the machine to repeatedly retry and eventually stop. Remove half the load, redistribute the remaining items evenly, and run the cycle again. If it completes successfully, overloading was the cause.
- 7
Note the exact point where the cycle stops
If the machine consistently stops at the same stage — for example, always during the first spin or always during the final rinse — take note of the programme indicator lights or any error code displayed. This information is very useful for a service technician and can help pinpoint whether the control board, motor, or a specific sensor is responsible.
When to call a service technician
If the machine stops at exactly the same point in every cycle regardless of load size, or if you see burn marks, smell burning plastic, or notice the control panel behaving erratically (buttons not responding, display flickering), these are signs of a control board or wiring fault that requires professional diagnosis. Do not continue using the machine if you suspect an electrical fault.
You should also contact a service technician if the door interlock has been replaced but the machine still stops, or if the drum fails to move at all during the cycle — this may indicate a motor or motor control board failure that is not safe or practical to address without specialist tools and parts.
Prevention
The parts most commonly replaced on LG washing machines for this fault are the door interlock switch, the drain pump, and the water inlet valve. Keeping the pump filter clean every one to three months is the single most effective maintenance step you can take to prevent mid-cycle stops. Using the correct amount of HE (high-efficiency) detergent also reduces excess suds, which can confuse the machine's sensors and cause premature cycle halts.
If you need to replace any of these components, use genuine LG parts or quality-matched alternatives to ensure compatibility across the 977 affected models. The widget below lets you search by your exact model number.
Spare parts and service
Visit our partners for spare parts and service
Spare parts
Book a repair
Frequently Asked Questions
What does the PF error code mean on my LG washing machine?
PF stands for Power Failure. It means the machine detected that power was interrupted during a cycle — even a very brief flicker is enough to trigger it. Check your circuit breaker and make sure the machine is plugged directly into a wall socket rather than an extension lead. Once power is stable, the error should clear after a reset.
Can I restart a cycle after it stops, or do I need to start from scratch?
On most LG models you can press the Start/Pause button to attempt to resume the cycle from where it stopped. If the machine does not respond, turn it off, wait 30 seconds, and turn it back on — it may offer to continue or will restart from the beginning. If clothes have been sitting in water for more than a couple of hours, it is safer to run a fresh rinse-and-spin cycle.
Why does my LG washing machine stop during the spin cycle specifically?
Stopping during spin is often caused by an unbalanced load — the machine detects excessive vibration and pauses to protect itself. Redistribute the laundry evenly inside the drum and press Start/Pause to continue. If the problem recurs with balanced loads, a worn drum bearing or a faulty motor brush may be responsible.
How often should I clean the drain pump filter on my LG washing machine?
LG recommends cleaning the pump filter every month if you do frequent washes, or at least every three months for average use. A blocked filter is one of the most common reasons a machine stops mid-cycle and is one of the easiest things to fix yourself. Regular cleaning also extends the life of the pump.
Is it safe to leave wet laundry in the machine while I troubleshoot?
For short troubleshooting sessions of an hour or two, leaving laundry in the drum is fine. Beyond that, damp clothes left in a sealed drum can develop mildew and unpleasant odours. If you expect the repair to take longer, remove the laundry and either hang it to dry or transfer it to another machine.