What Does Error Code PE Mean on an LG Washing Machine?
Check the pressure sensor hose for kinks, blockages, or disconnection — straighten or reattach it and restart the cycle to clear the error (takes about 10 minutes).
Fault description
Error code PE appears on your LG washing machine when the pressure sensor — also called the water level sensor — fails to send a reliable signal to the main control board. This sensor is responsible for telling the machine how much water is in the drum at any given point during a wash cycle.
When the PE error triggers, the machine will typically pause mid-cycle or refuse to start, because it cannot safely control water intake without knowing the current water level. Running without this information risks overfilling the drum or running the heater dry, so the machine shuts down as a precaution.
The fault can stem from something as simple as a loose hose connection or a blocked air chamber, through to a failed sensor or a fault on the main PCB. Working through the causes in order will help you identify the problem without unnecessary part replacements.
Causes
- Kinked or disconnected pressure sensor hose — A small rubber or plastic hose connects the pressure sensor to the drum's air chamber. If this hose becomes kinked, split, or pulls free from either end, the sensor receives no air pressure signal and triggers PE.
- Blocked air chamber or pressure port — Detergent residue, limescale, or debris can clog the small port at the base of the drum where the hose connects. A blocked port prevents pressure changes from reaching the sensor, giving a false or absent reading.
- Faulty pressure sensor — The pressure sensor itself can fail electrically or mechanically over time. When the sensor's internal diaphragm or circuitry deteriorates, it sends incorrect or no signal to the control board, triggering the PE error.
- Damaged or corroded wiring harness — The wiring loom connecting the pressure sensor to the main PCB can suffer from corrosion, chafing, or loose connector pins. Even a partial break in continuity is enough to cause an intermittent or permanent PE fault.
- Main PCB fault — If the control board's input circuit for the pressure sensor signal has failed, it will misread or ignore the sensor output entirely. This is less common but should be considered if all other components test correctly.
Step-by-Step Fix
- 1
Power cycle the machine
Switch the machine off at the mains and unplug it. Wait two full minutes, then plug back in and restart the cycle. Occasionally a temporary signal glitch causes a false PE error, and a full power reset clears it without any further action needed.
- 2
Locate and inspect the pressure sensor hose
Remove the top panel of the washing machine (usually two screws at the rear). The pressure sensor is a small round component, typically mounted near the top of the machine, with a thin hose running down to the drum. Trace the full length of the hose and look for kinks, cracks, or disconnected ends. Reattach any loose ends firmly and straighten any kinks before reassembling.
- 3
Clear the air chamber port
Detach the hose from the drum end and inspect the small port it connects to. Use a thin piece of wire or a toothpick to gently clear any visible debris or limescale buildup from the port opening. Blow gently through the hose to confirm airflow is unobstructed before reconnecting it.
- 4
Check the wiring harness and connector
With the machine still unplugged, locate the electrical connector on the pressure sensor. Unplug it, inspect the pins for corrosion or bent contacts, and press it firmly back into place. Follow the wiring loom toward the PCB and look for any visible chafing or damage along the route.
- 5
Test the pressure sensor with a multimeter
Disconnect the sensor's electrical connector and use a multimeter set to measure resistance across the sensor terminals. Consult your model's service data for the expected resistance range — a reading of zero or infinity typically confirms a failed sensor. If the reading is out of range, the sensor needs replacing.
- 6
Replace the pressure sensor
Order a replacement pressure sensor compatible with your specific LG model number. Fitting is straightforward — disconnect the hose and wiring connector, unclip or unscrew the old sensor, and fit the new one in reverse order. Run a short test cycle to confirm the PE error has cleared.
- 7
Inspect the main PCB if the fault persists
If a new sensor does not resolve the error and all wiring checks out, the fault likely lies with the main control board's sensor input circuit. Visual inspection may reveal burnt components or damaged tracks, but PCB diagnosis and replacement is best handled by a service technician.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If you have replaced the pressure sensor and confirmed the hose and wiring are in good condition but the PE error continues to appear, the main PCB is the most likely remaining cause. Diagnosing and replacing a control board requires specialist tools and carries a risk of further damage if handled incorrectly, so this is the point at which calling a qualified service technician is the sensible choice.
You should also seek professional help if you find burnt wiring, signs of water ingress near the PCB, or if the machine is displaying multiple unrelated error codes alongside PE — these symptoms suggest a more serious underlying electrical fault that goes beyond straightforward component replacement.
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Frequently Asked Questions
Can I still use my LG washing machine with a PE error showing?
No — when the PE error is active, the machine will not complete a wash cycle because it cannot safely monitor the water level. Attempting to force a cycle risks overfilling the drum or running the heating element without sufficient water, which can cause further damage. It is best to resolve the fault before using the machine again.
How do I know if the pressure sensor hose is the problem?
Remove the top panel and visually trace the hose from the sensor down to the drum. A split, kink, or disconnected end is usually easy to spot. You can also detach the hose and blow gently through it — if air passes freely and the hose is intact, the hose itself is likely fine and you should move on to testing the sensor.
Is the PE error the same as a water inlet fault?
No — PE specifically relates to the pressure sensor that measures water level, not the inlet valve that controls water flow. A water inlet fault would typically show a different error code on LG machines. If your machine is also struggling to fill with water, there may be a separate issue alongside the PE fault.
How much does a replacement LG pressure sensor cost?
Replacement pressure sensors for LG washing machines are generally an affordable part, typically ranging from around £10 to £30 depending on the model. Fitting it yourself keeps the total cost low. If you also need a service technician call-out, factor in the labour charge on top of the part cost.
Will the PE error clear itself after I fix the problem?
In most cases, once the underlying fault is resolved, the error will clear automatically when you restart the machine. If the code persists after a confirmed repair, try switching the machine off at the mains for two minutes before restarting. A code that returns immediately after a repair suggests the root cause has not yet been fully addressed.