E15
Ultenic Wi‑Fi Module / Communication Error

Robot vacuum shows E15 and cannot connect to Wi‑Fi or the Ultenic app.

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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

Weak Wi‑Fi signal, Incorrect Wi‑Fi password, 5 GHz network not supported, Faulty Wi‑Fi module on main board

How to Fix / Troubleshooting

Safety first: Keep the robot near your router during setup.

  • Check network: Ensure your router's 2.4 GHz band is enabled and broadcasting. Many Ultenic robot vacuums do not support 5 GHz only networks.
  • Reset Wi‑Fi: Press and hold the Wi‑Fi or Reset button on the robot (refer to manual) until you hear a prompt or see the Wi‑Fi indicator blink.
  • Re-add in app: Open the Ultenic app, choose Add Device, and follow the pairing instructions carefully, entering the correct Wi‑Fi password.
  • Reduce interference: Move the robot and router closer together during pairing. Temporarily disable VPNs or guest networks.
  • If E15 persists: The Wi‑Fi module integrated on the main PCB may be defective, requiring main board replacement.
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Repair Difficulty

Hard 4/5

Required Part

Wi‑Fi Module (on Main Control Board)
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