Electrolux Range Error Code LEDs 3,4

The LEDs 3,4 error on an Electrolux range signals an incorrect EEPROM checksum condition. The EEPROM (Electrically Erasable Programmable Read-Only Memory) is a small non-volatile memory chip integrated into the electronic control board that stores critical configuration data, calibration settings, and operational parameters for the range. When the control board reads this stored data at startup, it runs a checksum verification to confirm the data is intact. If the calculated checksum does not match the expected value stored in memory, the board flags this error and displays LEDs 3 and 4 simultaneously.

A checksum mismatch typically indicates that the data stored in the EEPROM has become corrupted or has been lost entirely. This corruption can occur due to a power surge or voltage spike that disrupts the write process, prolonged power fluctuations, component aging on the control board, or in some cases a capacitor failure near the EEPROM chip that causes data to degrade over time. The EEPROM cannot reliably self-repair once its stored values are compromised.

Because the EEPROM is soldered directly onto the electronic control board rather than existing as a user-serviceable standalone component, the corrective action is replacement of the entire control board. Attempting to operate the range with this error present is unreliable, as the board may not correctly regulate oven temperature, burner function, or safety lockout sequences without valid calibration and configuration data.