Walli
Contactor Chatter / Unstable Control Pilot
Walli charger makes a clicking sound repeatedly without starting a charge.
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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
Unstable CP signal due to poor connection, Weak control voltage from Walli PSU, Faulty contactor coil, Vehicle rapidly connecting/disconnecting pilot
How to Fix / Troubleshooting
Safety first: Repeated chattering can damage the contactor and indicates a control issue.
Steps:
- Test with another EV: Try a different vehicle to see if the behavior changes.
- Inspect connector: Check the Type 2 plug for dirt or damage that could cause intermittent CP contact.
- Internal inspection: With power off, check the contactor coil wiring and the low‑voltage connectors on the main board.
- Power supply check: A technician should verify that the low‑voltage supply to the contactor driver is stable.
- Replace contactor or board: If chattering persists, replace the Walli contactor and, if necessary, the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Walli power contactor
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