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Error code reference

Samsung Washer Error Code FL

Door lock fail error

Samsung codesSamsung washer codes

Door lock fail error — door lock switch terminal connected incorrectly, broken terminal, intermittent electric wire leakage, or main PCB fault.

First step from the service manual

In door unlock state, check motor resistance; in door lock state, check door lock contact resistance.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What FL means on a Samsung washer

The FL error code on a Samsung washer indicates a door lock failure. This code activates when the control system cannot confirm that the door has properly locked before or during a wash cycle. The door lock assembly, sometimes called the door latch or lid lock, uses a motor-driven mechanism and a set of electrical contacts to signal the main PCB that the door is secured. When those signals are absent, inconsistent, or out of expected range, the machine triggers FL and halts operation to prevent unsafe use.

The root causes fall into four main categories: an incorrectly connected door lock switch terminal, a broken or damaged terminal, intermittent electrical wire leakage in the door lock circuit, or a fault on the main PCB itself. Terminal connection issues are common after prior repairs or if the harness was disturbed during shipping or installation. Wire leakage, which refers to current escaping the intended circuit path due to damaged insulation or moisture intrusion, can produce intermittent FL errors that appear and disappear unpredictably.

Diagnosis begins by checking motor resistance at the door lock assembly while the door is in the unlocked state. Then, with the door moved to the locked state, the contact resistance across the door lock switch terminals should be measured. A door lock motor or switch that reads open circuit, shorted, or far outside the expected resistance range points to a failed lock assembly. If wiring and the lock assembly both check out, suspicion moves to the main PCB, which may be misreading or failing to send the lock command signal correctly.

Source: manufacturer service documentation.

Common causes of FL

  1. 01

    Incorrect or loose door lock terminal connection

    Wiring / connection

    A terminal on the door lock switch harness connector that is not fully seated or was connected to the wrong pin will prevent the PCB from receiving the correct lock signal. Visually inspect the connector at the door lock assembly and reseat any loose pins.

  2. 02

    Failed door lock assembly

    Part replacement

    The door lock motor or internal switch contacts can wear out or burn, causing an open or short circuit. Measuring resistance across the motor and contact terminals while cycling the lock through both states will reveal an out-of-range reading if the assembly has failed.

  3. 03

    Broken or damaged terminal

    Part replacement

    A physically broken terminal on the door lock connector or wiring harness can cause an intermittent or complete loss of the lock signal. Flex the wiring near the connector and hinge area while monitoring for any change in continuity.

  4. 04

    Intermittent electrical wire leakage

    Part replacement

    Damaged wire insulation in the door lock circuit can allow current to leak to ground or to adjacent conductors, producing unpredictable FL errors that are difficult to replicate consistently. Inspect the full length of the door lock wiring harness for chafing, pinching, or moisture damage.

  5. 05

    Main PCB fault

    Part replacement

    If the door lock assembly and all wiring check out within spec, the main PCB may be failing to send the lock drive signal or failing to read the feedback correctly. This is the least common cause and should only be considered after the lock circuit has been fully verified.

See the test procedure for each cause

Frequently asked questions about FL

What does FL mean on a Samsung washer?
FL stands for door lock fail error. It means the washer attempted to lock the door but the control board did not receive confirmation that the lock engaged properly. The problem can be a faulty door lock assembly, a loose or broken terminal on the lock connector, damaged wiring in the lock circuit, or a main PCB fault. The washer will not start or continue a cycle while this error is active.
Can I fix the FL error myself?
In some cases, yes. Start by unplugging the washer and firmly reseating the wiring harness connector at the door lock assembly, since a loose terminal is a common and easy fix. If that does not resolve it, you will need a multimeter to measure resistance at the door lock motor and switch contacts in both the locked and unlocked door positions. Replacing a door lock assembly is a moderately accessible DIY repair, but tracing intermittent wire leakage or replacing a PCB is more complex and may warrant a technician.
Is it safe to use my washer when the FL error is showing?
No. The FL error exists specifically because the washer cannot confirm the door is locked. Running the machine without a confirmed door lock creates a risk of the door opening during a spin cycle, which can cause water damage or injury. Do not attempt to bypass the door lock circuit or force the machine to run while this code is active.
How much does it cost to repair the FL error on a Samsung washer?
If the fix is simply reseating a connector, there is no parts cost involved. Replacing a door lock assembly typically costs between $30 and $90 for the part depending on the model. If you hire a technician, total repair costs including labor generally run between $100 and $250. A main PCB replacement, if required, can push costs considerably higher, sometimes into the $200 to $400 range for parts and labor combined.
Will resetting the washer clear the FL error?
A reset, typically done by unplugging the washer for a few minutes and restarting, may clear the FL code temporarily if the cause is an intermittent connection or a one-time communication glitch. However, if the underlying problem is a failed door lock assembly, damaged wiring, or a PCB fault, the error will return as soon as the machine attempts to lock the door again. A reset is a useful first step but is not a repair on its own.

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