not-turning-on Troubleshooting

Toothbrush won't turn on on the Ninja AF400 Max XL

Source: Ninja support — blender & air fryer troubleshooting Confidence: 80% Verified Aug 9, 2026

The electric toothbrush does not turn on, often due to a dead battery.

How to fix Toothbrush won't turn on

Check the power

Ensure the air fryer is plugged in and the outlet works.

Source: Ninja support — blender & air fryer troubleshooting Confidence: 80% Verified Aug 9, 2026

Difficulty: ★ Est. 2 min

Parts needed: Ninja AF400 Power Cable

Check the basket

Ensure the basket is fully inserted to engage the safety switch.

Source: Ninja support — blender & air fryer troubleshooting Confidence: 80% Verified Aug 9, 2026

Difficulty: ★ Est. 2 min

Parts needed: Ninja AF400 Basket

Replacement parts for the Ninja AF400 Max XL

Ninja AF400 Max XL Heating Element Ninja AF400 Max XL Power Cord Ninja AF400 Basket Ninja AF400 Crisper Tray Ninja AF400 Filter Ninja AF400 Power Cable

← All Ninja AF400 Max XL error codes

As an Amazon Associate we earn from qualifying purchases. Prices and availability are accurate as of the time shown and may change. We research product data independently.