| Symptom | Fix |
|---|---|
| No LEDs light | Batteries dead / inserted wrong / corrosion on contacts. Clean with vinegar/alcohol. |
| Blinks forever, never solid | Interference (Wi-Fi router, microwave, Bluetooth, USB 3.0). Move Wii/remote. Remove other BT devices. |
| Syncs but disconnects in game | Low battery. Weak Bluetooth. Sensor Bar blocked (candles work as IR source). |
| Won't sync Player 1 | Sync Player 2 first (press 1+2 on second remote), then sync Player 1. |
| Sensor Bar not detected | Check cable (Fat Wii) / wireless battery (Wii U sensor bar). Test with phone camera (see IR dots). |
Label remotes (1,2,3,4) with tape. Sync in order. Avoid "which remote is player 3" chaos.