E9
Schumacher
Ground Continuity / Protective Earth Fault
Display shows E9; charger will not start charging and may beep or flash LEDs.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open ground in supply circuit, Loose ground lug inside charger, Corroded ground connection at service panel, Faulty ground detection circuit on control board
How to Fix / Troubleshooting
Safety first: Do not use the charger until the ground fault is resolved. Turn OFF the breaker and lock it out if possible.
- Verify ground at receptacle or hardwire point: Have an electrician test the EV circuit for a solid equipment ground using an appropriate tester or meter.
- Inspect ground conductor: With power OFF, open the junction box or charger input compartment and confirm the ground wire is securely attached to the ground lug and not corroded or broken.
- Check for paint or rust: Ensure the ground lug is bonded to bare metal, not painted or rusted surfaces.
- If wiring is correct: The internal ground detection circuit on the Schumacher control board may be faulty. Contact Schumacher support or an EVSE technician for board replacement.
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Repair Difficulty
Hard
4/5
Required Part
Ground Detection Circuit on Control Board
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