E09
Amperfied
Contactor Feedback / Weld Detection Error
Charger shows E09 and stops charging shortly after start; may be logged as ‘relay feedback error’.
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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
Feedback contacts on main contactor not switching correctly, Welded main contacts, Broken feedback wiring harness, Faulty feedback input on control board
How to Fix / Troubleshooting
Warning: This involves high‑voltage components. Only qualified personnel should open the charger.
- Do not force operation: If the charger suspects welded contacts, continued use can be dangerous. Leave the unit off until inspected.
- Power‑cycle: Turn off the supply breaker for 5 minutes, then restore power and see if the error clears temporarily.
- Technician checks: A technician should open the unit, verify the mechanical operation of the contactor, test the auxiliary/feedback contacts, and inspect the feedback wiring harness for loose or broken connections.
- Replace contactor if needed: If welding or mechanical failure is found, the main power contactor must be replaced with the correct Amperfied‑approved part.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Power Contactor with Feedback Contacts
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