How to Fix / Troubleshooting

Safety first: Repeated relay operation can indicate a serious fault. Turn OFF the breaker if chattering continues.

Try another vehicle: If the charger works normally with a different EV, the original vehicle may have a pilot or onboard charger issue.
Check supply voltage: Have an electrician verify that the line voltage is stable and within the charger’s rated range during startup.
Listen closely: If the contactor chatters even with no vehicle connected (during self-test), the control board or contactor coil may be faulty.
Service required: Replace the main contactor and/or control board as recommended by a qualified EVSE technician.

Charger clicks repeatedly (relay chatter) when a vehicle is connected, but charging does not start.

Possible Causes