Charger shows E05 and does not start charging; app or display may indicate ‘undervoltage’ or ‘grid voltage too low’.

Safety first: Persistent undervoltage can cause overheating and unreliable operation. Do not attempt to bypass protections.

Steps to try:

• Check other loads: If lights dim significantly when large appliances run, your supply may be weak. Contact your utility provider.
• Inspect cable run (electrician only): Have a qualified electrician verify cable size, length, and terminations from the consumer unit to the Hager charger. Excessive voltage drop may require a larger cable.
• Power-cycle the charger: Turn OFF the EV charger breaker for 30 seconds, then ON. Try again at a lower charging current if your charger or vehicle allows current limiting.
• Measure voltage: An electrician should measure voltage at the charger terminals during a charging attempt. If voltage is within spec but E05 persists, the internal sensing circuit may be defective.
• Replace faulty electronics: If confirmed, the main control board or power supply module inside the charger should be replaced by a Hager‑authorised technician.