Robot vacuum reports E12 and may not connect to Wi-Fi or app; sometimes shown as Wi-Fi module error.

Safety first: Ensure the robot is on a stable surface and not running a cleaning cycle while you troubleshoot connectivity.

Step-by-step:

• Reset Wi-Fi: Follow the Eufy manual to reset Wi-Fi (often by pressing and holding a specific button until you hear a voice prompt). Re-add the robot in the EufyHome app.
• Check network: Confirm your router is broadcasting a 2.4 GHz network (most Eufy robots do not support 5 GHz only). Move the robot closer to the router during setup.
• Reboot robot and router: Power cycle both devices to clear temporary communication issues.
• Advanced inspection: If E12 persists, open the robot to inspect the Wi-Fi module or antenna wire on the main PCB. Ensure the antenna connector is firmly attached and the cable is not cut or pinched.
• Board replacement: If the Wi-Fi chip is visibly damaged or overheated, the main control board may need replacement, as the Wi-Fi module is often integrated.

When to stop: If you are not comfortable opening the robot, contact Eufy support for connectivity diagnostics.