E18
EO Charging
EV‑to‑Charger Communication / PWM Fault
Charger shows E18; app may report vehicle communication error or EVSE protocol 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
Incorrect PWM duty cycle generation on EO PCB, Vehicle not responding to pilot signal, Damaged CP resistor network, Firmware incompatibility with specific EV
How to Fix / Troubleshooting
Safety first: Communication faults are low‑risk electrically, but always isolate power before opening the unit.
- Test with another EV: If possible, connect a different vehicle to determine whether the issue is vehicle‑specific.
- Inspect CP components: With power off, visually inspect the area of the PCB associated with the control pilot circuit for burnt resistors or damaged components.
- Check connector and cable: Ensure the CP conductor and its terminals are intact from the PCB to the Type 2 connector.
- Firmware update: Use the EO app or installer tools to check for and apply any firmware updates that may improve compatibility with newer EVs.
- Replace PCB if necessary: If E18 persists across multiple vehicles and after firmware updates, the PWM generation or sensing circuitry on the PCB may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
EO main control PCB
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