What is a supply voltage error?

A supply voltage error means your Andersen charge point has detected that the incoming electrical voltage at your property is outside the standard operating range required for safe charging.

• The legal limit: In the UK, domestic mains voltage is legally required to operate within a threshold of 216V to 253V.
• Safety monitoring: Your Andersen charger constantly monitors your property's voltage to protect your vehicle, the charge point itself, and your home infrastructure. It is equipped with advanced built-in safety features, including PEN fault detection.
• Automatic protection: If the charge point detects a sudden voltage drop or a power spike, it will automatically reduce the charge rate or stop the charging session entirely depending on how severe the fluctuation is.
• Resuming the charge: Charging will automatically resume as soon as the grid voltage returns to a safe, stable level. In some instances where a severe overvoltage event has occurred, charging will remain halted until the error is manually reset.

Because your charger can only monitor your electricity supply but cannot control it, frequent errors indicate an issue with the local power grid.

• Contact your DNO: If you experience supply voltage errors regularly, you should contact your Distribution Network Operator (DNO). They are the company responsible for the physical electricity cables and power supply entering your home.
• Request an investigation: You can ask your DNO to investigate the voltage fluctuations at your property.
• Get backup data: If you need historical voltage data from your charger to help support your case with your DNO, please contact us and we can provide this for you.