E14
Walli
EV Communication / PWM Signal Fault
Charger shows E14; app indicates 'Communication error with vehicle' or 'EVSE‑EV comms fault'.
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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
Distorted CP PWM due to faulty driver, Electrical noise from nearby equipment affecting Walli, Vehicle‑side communication fault, Defective Walli main control board
How to Fix / Troubleshooting
Safety first: This is typically a low‑voltage signaling issue, but always de‑energize before opening the unit.
Steps:
- Test with another EV: Try charging a different vehicle to determine if the issue is vehicle‑specific.
- Check cable routing: Ensure the Walli cable is not tightly bundled with high‑power cables or near large motors that can induce noise.
- Power cycle: Turn off the Walli breaker for 5 minutes, then restore power and retry.
- Firmware update: Use the Walli app to check for and apply any firmware updates that may address communication issues.
- If E14 persists with multiple vehicles: The CP PWM driver or communication logic on the Walli main control board is likely defective and the board should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Walli main control board
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