Charger shows E21 and will not charge; app may indicate ‘RTC error’ or ‘clock failure’.

Safety: This is not typically a shock hazard, but turn OFF power before opening the unit.

• Step 1 – Reset time: Use the Enel X app to manually set the correct date and time, then reboot the charger.
• Step 2 – Firmware update: Check for and install any firmware updates that may address RTC issues.
• Step 3 – Board inspection: With power OFF, inspect the control board for a small coin‑cell battery (if used). A corroded or depleted battery can cause RTC errors.
• Resolution: Replace the RTC backup battery if user‑serviceable. If not, or if E21 persists, the main control board may need replacement.