Charger shows E103 and will not energize; app may indicate 'Ground fault detected'.

Safety: Do not continue trying to charge until the cause of the ground fault is identified. Turn OFF the breaker supplying the charger.

• Inspect for moisture: Check the J1772 connector and the area around the charger for signs of water, condensation, or recent heavy rain. If the connector is wet, allow it to dry completely indoors for at least 24 hours.
• Check cable integrity: Look for cuts, abrasions, or crushed sections along the Enphase cable. Any exposed conductor or deep damage requires cable replacement.
• Try a different vehicle (if possible): If E103 only occurs with one vehicle, the ground fault may be in the vehicle's inlet or onboard charger. Consult the vehicle manufacturer.
• Reset attempt: After drying and inspection, turn the breaker ON, wait for the charger to initialize, and plug in again. If E103 immediately returns, the internal GFCI module or control board is likely faulty.
• Service required: Internal GFCI components are not user-serviceable. Contact an Enphase-qualified technician to test leakage current and replace the control board or GFCI sensor assembly.