Blink EV charger displays E04 and the screen may indicate an overvoltage condition; charging is aborted.

Safety first: Only qualified persons should measure live voltages. Turn off power before opening the unit.

Steps to troubleshoot:

• Measure supply voltage: At the service panel or disconnect, use a multimeter to verify line-to-line (and line-to-neutral if applicable) voltage. Compare to the Blink charger's nameplate rating.
• Check for miswiring: Confirm that the charger is connected to the correct breaker size and voltage (e.g., 240V split-phase for residential Blink units). Correct any miswiring immediately.
• Inspect terminations: With power OFF, tighten all line and ground lugs inside the Blink unit and at the breaker. Look for heat discoloration or corrosion.
• Power quality issues: If voltage is intermittently high (e.g., above 253V on a 240V system), contact your utility provider. The charger is correctly protecting itself.
• Control board fault: If measured voltage is normal but E04 persists, the internal voltage sensing circuit on the main control board may be defective and require replacement.

Do not bypass overvoltage protection. Persistent E04 with normal supply should be escalated to Blink support or an EVSE technician.