Brand: NINJA
Category: Air Fryer
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for SL400EU
Uploaded: April 20, 2026, 7:36 p.m.
Warranty Information
This product comes with a 2-year limited warranty covering parts and labor.
Using Your Air Fryer
Cooking with Double Stack Pro: Allows cooking 4 foods at once in 2 independent drawers. You can cook in both zones or a single zone.
Cooking with DualZone Technology: Utilizes two cooking zones for versatility. The Sync feature ensures both zones finish at the same time.
Cooking in a single zone: Select a zone and choose a function (Air Fry, Max Crisp, Bake, Roast, Reheat, Dehydrate). Set temperature and time, then press START/STOP.
Ending Cook Time in One Zone: Select the zone, press START/STOP.
Pausing Cooking: Automatically pauses when a drawer is removed. Re-insert to resume.
SYNC: Finishes cooking at the same time, regardless of different settings.
MATCH: Cooks a larger amount of the same food or different foods with the same settings.
Troubleshooting and error codes
| Issue | Solution |
|---|---|
| How do I adjust temperature or time when using one zone? | Select the active zone, press TEMP and use the dial to adjust temperature, or press TIME and use the dial to adjust time. |
| How do I adjust temperature or time when using dual zones? | Select the desired zone, press TEMP and use the dial to adjust temperature, or press TIME and use the dial to adjust time. |
| Does the unit need to be preheated? | No, the unit does not require preheating. |
| Can I cook different foods in each zone without cross-contamination? | Yes, both zones are independent with separate heating elements and fans. |
| How do I pause the countdown? | The countdown timer automatically pauses when a drawer is removed. Reinsert the drawer within 2 minutes to resume or the unit will automatically turn off. |
| How do I stop one zone when using both zones? | To stop one zone, press the zone button then START/STOP. To stop both zones, just press START/STOP. |
| Can I place the drawer on my countertop? | The drawer gets hot during cooking. Handle with care and place only on heat-resistant surfaces. |
| When should I use the crisper plate? | Use the crisper plate when you want crispy food. It lifts food higher in the basket, allowing air to circulate for even cooking. |
| When should I use the stacked meal racks? | Use stacked meal racks for cooking two layers of food in one drawer. Place vegetables/starch in the bottom and protein in the upper half. Do not mix fresh and frozen ingredients in the same drawer. |
| Why is my food not cooked thoroughly? | Ensure the drawer is fully inserted. Distribute ingredients evenly on the bottom of the drawer, do not overlap. Shake the drawer to mix ingredients for even crispiness. Temperature and time can be adjusted at any point. |
| Why is my food burnt? | Check food progress and remove when desired color is reached. Remove immediately at the end of cook time to avoid overcooking. |
| Why are some ingredients blown around during air frying? | Light ingredients may be blown around by the fan. Secure loose, light ingredients with a cocktail stick. |
| Can I air fry wet, battered ingredients? | Yes, use the correct coating technique: flour, then egg, then breadcrumbs. Press breadcrumbs firmly onto the food to prevent them from being blown away. |
| Why is the unit beeping? | Food is ready, or cooking has started in the other zone. |
| Why is the display dark? | The unit is in standby mode. Press the power button to turn it back on. |
| Why is there an "E" message on the display? | The unit is not functioning properly. Seek online support at ninjakitchen.eu. |