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Error code reference

Daewoo Washer Error Code lb

IGBT error

Daewoo codesDaewoo washer codes

IGBT error — the PCB assembly is defective.

First step from the service manual

Change the PCB ASS'Y.

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

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What lb means on a Daewoo washer

The lb error code on a Daewoo washer indicates a fault within the IGBT (Insulated Gate Bipolar Transistor) circuit on the PCB assembly. The IGBT is a power semiconductor device responsible for controlling the high-frequency switching of current to the motor drive circuit. When the control board detects abnormal behavior from this component, such as overcurrent, overheating, or a failed switching signal, it triggers the lb fault code and halts machine operation to prevent further damage.

The PCB assembly in a Daewoo washer integrates the IGBT alongside other motor control components. A failure in this transistor can stem from voltage spikes entering through the power supply, prolonged thermal stress from repeated heavy-load cycles, or an internal short within the transistor itself. Because the IGBT is soldered directly onto the control board, a fault in this device is treated as a defective PCB assembly rather than an individually serviceable component in most repair scenarios.

The primary and recommended corrective action for an lb error is replacement of the entire PCB assembly. Attempting to test or bypass the IGBT without proper power electronics expertise and equipment carries significant risk of electric shock and further board damage. Technicians should confirm the lb code is persistent and not caused by transient power supply issues before condemning and replacing the board.

Source: manufacturer service documentation.

Common causes of lb

  1. 01

    Defective PCB Assembly with Failed IGBT

    Part replacement

    The IGBT transistor on the control board has failed internally due to a short circuit or open fault. This is the primary diagnosed cause for the lb code, and the entire PCB assembly requires replacement.

  2. 02

    Voltage Spike or Power Surge Damage

    Part replacement

    A sudden surge in the incoming power supply can destroy the IGBT switching circuit on the control board. Check for signs of burn marks or discoloration on the board near the motor drive section.

  3. 03

    Thermal Overload of the IGBT

    Part replacement

    Repeated heavy wash loads or poor ventilation around the control board can cause the IGBT to overheat over time, degrading its semiconductor junctions until failure occurs.

  4. 04

    Intermittent Power Supply Fluctuation

    Wiring / connection

    Unstable or low household voltage can cause erratic IGBT switching behavior that triggers the lb fault. Verify the incoming line voltage is within the specified range before replacing the board.

See the test procedure for each cause

Frequently asked questions about lb

What does lb mean on a Daewoo washer?
The lb error code on a Daewoo washer indicates an IGBT error, meaning the power transistor responsible for controlling the motor drive circuit has failed. This fault is located on the PCB assembly, and the control board is considered defective when this code appears. The washer will not operate normally until the issue is resolved. Replacement of the PCB assembly is the prescribed repair action.
Can I fix the lb error on my Daewoo washer myself?
The lb error requires replacement of the PCB assembly, which involves working near high-voltage components. A knowledgeable DIYer comfortable with appliance board swaps can complete the replacement, but the work should be done with the washer fully unplugged. Sourcing the correct replacement board for the specific Daewoo model is essential before attempting the repair.
Is it safe to use my Daewoo washer while it shows the lb error?
No, the washer should not be used while displaying the lb error code. A failed IGBT on the control board means the motor drive circuit is compromised, which could lead to unpredictable motor behavior or additional component damage. Power the unit off and disconnect it from the outlet until repairs are completed.
Will resetting my Daewoo washer clear the lb error code?
A simple reset is unlikely to permanently clear the lb error because it indicates a hardware failure in the IGBT circuit on the control board. The code may temporarily disappear after a power cycle, but it will return as soon as the washer attempts to run the motor. The underlying board fault must be corrected through PCB assembly replacement.
How much does it cost to fix a Daewoo washer lb error?
Repair costs for an lb error depend primarily on the price of the replacement PCB assembly, which typically ranges from around 80 to 200 dollars or more depending on the model. Adding professional labor for diagnosis and installation can bring the total repair estimate to somewhere between 150 and 350 dollars. Getting a cost estimate from a technician before proceeding is advisable, especially on older machines.

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