Charger shows E18; unit may not connect to network or may refuse to start when network is required.

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.

Possible Causes

Loose Ethernet or cellular module connection, Failed network daughterboard, Firmware mismatch between main board and network module, Damaged network cable or antenna

How to Fix / Troubleshooting

Safety first: Turn off power before handling internal modules.

Check physical connections: Ensure Ethernet cables, cellular modems, or Wi‑Fi modules are firmly seated and undamaged.
Inspect antenna (if cellular/Wi‑Fi): Verify that the antenna is connected and not damaged or waterlogged.
Reboot system: Power cycle the charger and any associated network equipment (switches, routers) and observe if E18 clears.
Module replacement: If the network module remains unresponsive, replace the Sun Country Highway-specified network daughterboard or modem.

Repair Difficulty

Medium 3/5

Required Part

Network Communication Module

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