Display shows 'EEPROM ERROR', settings do not save or revert after power cycle.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Worn-out EEPROM from excessive writes, Corrupted configuration data, Faulty EEPROM chip on main board

Safety first: Power off before replacing boards.

Step 1 – Factory reset: Use the menu or web interface to perform a factory reset of settings. Reconfigure and see if they now save correctly.
Step 2 – Firmware reflash: Reflash the main firmware to ensure configuration structures match the code version.
Step 3 – Board replacement: If settings still will not save or EEPROM errors persist, the EEPROM or MCU flash is likely defective. Replace the main control board.

Medium 3/5

OpenEVSE Main Control Board

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