| Symptom | Possible Cause | Fix | |---------|----------------|-----| | (LED on, but you can’t smell anything) | Pod not seated correctly or empty | Remove and re‑insert the pod; replace if empty. | | Humming sound louder than usual | Dust on ultrasonic plate | Clean plate gently with a dry brush. | | LED stays solid red | Power insufficient / battery low | Use a wall outlet or fully charge power bank. | | Cat shows signs of stress | Over‑diffusion or allergic reaction | Switch to “Night‑Shift” mode, increase distance, or discontinue use. | | App can’t pair | Bluetooth interference / outdated firmware | Turn Bluetooth off/on, ensure firmware is latest via USB update. |