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Error code reference

Daewoo Refrigerator Error Code EP

EEPROM error (Full Automatic models only).

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EEPROM error (Full Automatic models only).

First step from the service manual

LED blinks on and off continually; check or replace M-PCB.

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

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What EP means on a Daewoo refrigerator

The EP error code on Daewoo Full Automatic refrigerators indicates an EEPROM (Electrically Erasable Programmable Read-Only Memory) fault. The EEPROM is a small non-volatile memory chip integrated into or closely associated with the Main Printed Circuit Board (M-PCB). This chip stores critical appliance configuration data including temperature calibration values, operational settings, and model-specific parameters that the control system reads at startup and during normal operation. When the control board cannot successfully read from or write to this memory, it triggers the EP code.

The most visible symptom accompanying this error is a continuous LED blinking pattern on the control panel, which persists as long as the fault condition exists. This behavior reflects the board's inability to retrieve valid data from the EEPROM, leaving the refrigerator in a fault state. Causes can include corrupted EEPROM data due to a power surge or unstable voltage supply, physical damage to the memory chip itself, or failure of the M-PCB circuitry that interfaces with the EEPROM.

Because the EEPROM is typically soldered directly onto the M-PCB, component-level repair requires electronics expertise and specialized equipment. In most field repair scenarios, the appropriate corrective action is full M-PCB replacement. Simply cycling power may not resolve the issue if the EEPROM data has been corrupted or if the chip has physically failed. This error code is specific to Full Automatic model variants in the Daewoo refrigerator lineup and does not apply to all Daewoo refrigerator configurations.

Source: manufacturer service documentation.

Common causes of EP

  1. 01

    Corrupted EEPROM data from power surge

    Wiring / connection

    A sudden power surge or voltage spike can corrupt the data stored in the EEPROM chip, causing the control board to fail its memory read. This is one of the most common triggers, especially in areas with unstable power supply.

  2. 02

    Failed EEPROM chip on M-PCB

    Part replacement

    The EEPROM chip itself can fail due to age, heat stress, or electrical overstress, making its stored data unreadable. Since the chip is soldered to the M-PCB, this effectively requires board-level repair or full M-PCB replacement.

  3. 03

    M-PCB circuit failure

    Part replacement

    Damage or failure in the M-PCB circuitry responsible for communicating with the EEPROM can produce the same EP fault even if the memory chip itself is intact. Inspecting the board for visible burn marks, cracked solder joints, or damaged traces may help identify this.

  4. 04

    Unstable or low supply voltage to the board

    Wiring / connection

    Chronic undervoltage or fluctuating power to the M-PCB can prevent the EEPROM from operating reliably, triggering intermittent or persistent EP errors. Checking the incoming voltage supply and any power regulation components on the board is a useful diagnostic step.

See the test procedure for each cause

Frequently asked questions about EP

What does EP mean on a Daewoo refrigerator?
EP indicates an EEPROM error on Daewoo Full Automatic refrigerator models. The EEPROM is a memory chip on the Main PCB that stores configuration and calibration data the control system needs to operate. When the board cannot read or write to this chip, it triggers the EP code and causes the panel LED to blink continuously. This error is exclusive to Full Automatic model variants in the Daewoo lineup.
Can I fix the EP error myself without replacing parts?
In some cases, a power surge may have caused a temporary data corruption that is not recoverable without board intervention, so DIY resolution is limited. You can try unplugging the refrigerator for several minutes to see if the error clears, but if the EEPROM chip or M-PCB circuitry has physically failed, this will not help. Most repairs for this error code require inspecting or replacing the M-PCB, which is best handled by a technician with electronics experience.
Will resetting the refrigerator clear the EP error code?
A power reset by unplugging the unit may temporarily clear the error if the EEPROM data corruption was minor and recoverable, but it will not fix an underlying hardware fault. If the LED resumes blinking after power is restored, the M-PCB or EEPROM chip requires further diagnosis. Persistent EP errors after a reset strongly indicate the need for board replacement.
Is it safe to keep using my Daewoo refrigerator when the EP error is showing?
When the EP error is active, the refrigerator may not be operating with its correct temperature and control settings, since those are stored in the faulty EEPROM. This means cooling performance could be unreliable, which poses a food safety risk if temperatures are not being maintained properly. It is advisable to check actual compartment temperatures with a separate thermometer and minimize use until the fault is resolved.
How much does it cost to repair the EP error on a Daewoo refrigerator?
Repair costs depend on whether the M-PCB needs to be replaced and local labor rates, but M-PCB replacements for refrigerators typically range from around 100 to 300 dollars or more including parts and labor. Diagnostic fees from a technician may be charged separately before repair begins. Getting a quote before authorizing work is recommended, especially on older units where the repair cost may approach the value of the appliance.

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