Troubleshooting: Voltage Errors

The UK Government provides minimum technical specifications for charging points that Ohme chargers are required to meet. One requirement for single-phase AC chargers, like Ohme chargers, is for the incoming electrical supply to the property to equal 230+/- 10% volts. This means that the incoming electrical supply to the property (via your local electrical substation) must be between 207 volts to 253 volts for the charger to operate.

What are Over- or Under- Voltage errors?

If the voltage level is higher than 253V or lower than 207V, Ohme will temporarily pause charging, and resume charging once the voltage levels are at a suitable level again. The charger will also show a red flashing ‘error’ light when these voltage issues are detected to alert you to this – these are recorded as ‘Overvoltage’ or ‘Undervoltage’ errors for your Charger.

If you have an Home Pro charger, you can check the live voltage reading when the charger is plugged in by tapping ‘Next View’ button twice to see this screen.

If you notice the highlighted number is above 253V, this means the charger has an ‘Overvoltage’ error, and if it is showing below 207V, this means the charger has an ‘Undervoltage’ error.

How to solve Voltage issues

If you believe your voltage levels may be too high, or too low, and this is affecting your charging, your Distribution Network Operator (DNO) will be able to test the voltage levels at your home and help to adjust the voltage to the correct level. You can find out who your DNO is via the following support article: Ohme Support | Your installation

To ensure accurate testing, it is important for the DNO to monitor the voltages over the course of a few days, as a single reading may not be pick up the issue. This is because the voltage levels fluctuates throughout the day and night. During this monitoring period, we recommend to continue using the charger as usual during this monitoring period.

Once the high or low voltage level has been confirmed, the DNO will help to resolve the issue at your local substation.

If, however, you continue to experience any voltage issues after the DNO has confirmed the local levels have been adjusted, please contact our Customer Care team below to confirm this with any supporting reports from the DNO, and we can help action the next steps to get you charging again.