If you are staring at your display wondering about the LG washing machine FL error, you are likely dealing with a frustrating interruption to your laundry routine. In the world of LG front load washer codes, “FL” is a common point of confusion that often indicates a specific water level or locking issue that requires immediate attention.
This guide will demystify this error, explain its connection to critical components like the water level sensor and pressure switch, and provide actionable steps to resolve it.
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What does the LG washing machine FL error mean?
Technically, LG washing machines do not have a standardized “FL” error code in their official manuals. However, many users report seeing what looks like an LG washing machine FL error on their digital display. This is almost always a misinterpretation of one of two standard codes due to the 7-segment display font:
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- FE (Flood Error): The machine detects that the water level is too high. This is the most likely culprit if your machine is filling with water uncontrollably or if the drain pump runs constantly.
- CL (Child Lock): The “C” can look like an “F” on some displays. If the door is locked and buttons are unresponsive, this is your issue.
Given the entities involved—such as the pressure switch and water inlet valve—this guide focuses on the “Flood/Fill” interpretation (FE), as this is a critical mechanical fault that matches the “FL” symptom description.
Common causes of the FL (Flood/Fill) error
When the LG washing machine FL error (or FE) triggers, the main control board has received a signal that the water level is dangerously high. This triggers the drain pump to run automatically to prevent flooding.
1. Faulty water inlet valve
The water inlet valve controls the flow of water into the tub. If this valve is mechanically stuck open due to debris or calcium buildup, water will continue to enter the machine even when the washer is turned off or the cycle is paused.
2. Malfunctioning pressure switch (Water level sensor)
The pressure switch, also known as the water level sensor, monitors the amount of water in the drum. It operates via a pressure switch hose (air tube) that traps air as water rises. If the sensor fails or the hose is clogged, it sends incorrect data to the main control board, causing the machine to think it is overfilling or underfilling.
3. Main control board glitch
The main control board is the brain of the washer. If the board’s relays fail, it may continuously send power to the inlet valves or fail to read the pressure switch signals correctly, triggering the fault code.
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Step-by-Step troubleshooting guide
Follow these steps to diagnose and fix the issue safely.
Step 1: Perform a hard reset
Before disassembling any parts, attempt a hard reset to clear any temporary electronic glitches in the LG ThinQ system or control board.
- Unplug the washer from the power outlet.
- Press and hold the Start/Pause button for 5 seconds.
- Wait for 5 minutes.
- Plug the washer back in and run a short rinse cycle to see if the LG washing machine FL error returns.
Step 2: Inspect the water inlet valve
If the drum fills with water even when the machine is off, the water inlet valve is defective.
- Turn off the water supply taps.
- Disconnect the inlet hoses and check the mesh filters for sediment.
- If cleaning the filters doesn’t help and water still seeps in when the tap is on, replace the water inlet valve assembly.
Step 3: Check the pressure switch and air tube
A compromised pressure switch hose (air tube) is a frequent cause of water level errors.
- Remove the top panel of your front load washer.
- Locate the pressure switch (usually a round sensor with a small hose attached).
- Inspect the air tube for kinks, holes, or blockages. Ensure it is tightly connected to both the sensor and the air chamber on the tub.
- Check the wiring harness connecting the sensor to the control board for any loose or corroded wires.
- If the hose is clear and the wiring is good, the water level sensor itself may need replacement.
Step 4: Examine the drain pump
While the “FL” or FE error is primarily about filling, a blocked drain pump can exacerbate the issue if the machine cannot empty the excess water.
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- Open the small access door at the bottom front of the washer.
- Unscrew the drain filter and clean out any lint, coins, or debris.
- Verify the pump impeller spins freely.
When to contact a professional
If you have replaced the water inlet valve and pressure switch but the LG washing machine FL error persists, the issue likely lies with the main control board. Replacing the board requires precise part matching and careful handling of the wiring harness.
Additionally, if your machine is Wi-Fi enabled, use the LG ThinQ app to run a “Smart Diagnosis.” This feature can often translate the ambiguous “FL” display into a specific internal fault code, confirming whether you are dealing with a sensor failure or a board issue.
By systematically checking the water level sensor, air tube, and valves, you can often resolve this error without the need for an expensive service call.
Frequently asked questions
What is the most common cause of the FL error code on an LG washer?
While “FL” is not an official LG code, it is almost always a misinterpretation of the “FE” (Flood Error). The most common cause is a faulty water inlet valve that remains stuck open or a malfunctioning pressure switch that fails to signal the machine to stop filling.
How do I perform a hard reset to clear the FL error?
To perform a hard reset, unplug the washer from the wall outlet. Press and hold the Start/Pause button for five seconds, then wait about five minutes for the capacitors to discharge. Plug the machine back in and start a new cycle to see if the code has cleared.
Could the FL code actually be the Child Lock setting?
Yes. Due to the digital font on many LG displays, the “CL” (Child Lock) code can look very similar to “FL.” If the washer buttons are unresponsive and the door is locked, try holding the “Child Lock” button (or the combination of buttons indicated by a lock icon) for three seconds to disable it.
Why is my drain pump running constantly when this error appears?
If the machine interprets the error as “FE” (Flood Error), the main control board triggers the drain pump as a safety measure. This is designed to pump out excess water automatically to prevent the drum from overfilling and causing a flood in your home.
Can the LG ThinQ app help identify this specific error?
If you have a Wi-Fi enabled model, you can use the Smart Diagnosis feature within the LG ThinQ app. This tool provides a more detailed breakdown of internal faults and can confirm whether the “FL” you see is actually a water level sensor failure (FE) or a different mechanical issue.
