Charger shows E04 and does not energize; sometimes occurs after a lightning storm or power surge.

Safety first: Voltage issues can damage equipment and pose shock hazards. Only qualified persons should measure live voltages.

• Measure supply voltage: Using a multimeter, verify the line-to-line or line-to-neutral voltage at the charger input matches the rated voltage (e.g., 208–240 V for many Zencar models). If outside range, contact an electrician or utility.
• Check terminal tightness: With power OFF, remove the Zencar input cover and ensure all line, neutral (if used), and ground terminals are tight and free of discoloration or burning.
• Inspect surge components: Look for burnt MOVs, fuses, or input filter components on the power supply board. Any signs of charring or cracking indicate the board should be replaced.
• Try a different circuit: If the charger is plug-in style, test it on another properly wired outlet with the correct voltage and breaker size.
• If E04 remains with correct voltage: The internal SMPS / power supply module or main control PCB is likely damaged and must be replaced.