Charger shows E004 and will not charge; may occur after a power fluctuation or storm.

Safety first: High voltage can damage equipment and cause shock. Only qualified persons should measure live voltages.

• Verify model rating: Confirm the Autel charger model is rated for your supply (e.g., 208–240 V). Check the nameplate on the side or inside the cover.
• Measure line voltage: Have an electrician measure L–L and L–N voltages at the charger input. If voltage exceeds the specified range, the supply must be corrected before using the charger.
• Check neutral (if used): In split-phase systems, a loose or missing neutral can cause one leg to rise above normal. Tighten neutral connections in the panel and at the charger terminal block.
• Inspect surge protection: If a surge protective device (SPD) is installed upstream, verify it has not failed or indicated end-of-life. Replace if necessary.
• Reset charger: After confirming proper voltage, power-cycle the charger for at least 2 minutes. If E004 persists with correct supply voltage, the input voltage sensing circuit on the main control board may be damaged and require replacement.