Ninja OS401 the pressure lid will not come off
Cause 1 of 2The unit is not completely depressurized. As a safety feature, the pressure lid will not unlock until it is. Source: Troubleshooting Guide: Why can't I take the pressure lid off?, p. 22
First checkTurn the pressure release valve to the VENT position to quick release the pressure. When the steam is completely released, the unit is ready to open.
Causes and checks
The unit is not completely depressurized. As a safety feature, the pressure lid will not unlock until it is. Source: Troubleshooting Guide: Why can't I take the pressure lid off?, p. 22
- Turn the pressure release valve to the VENT position to quick release the pressure. When the steam is completely released, the unit is ready to open. See Release pressure with the quick release.
- Turn the lid counterclockwise to unlock it, and lift it at an angle. Do not lift it straight up. See Remove the pressure lid.
Steam does not release when the pressure release valve is moved to VENT. Source: Important Safeguards: item 42, p. 4
- Do not intentionally press down on the float valve.
- Unplug the unit from the wall and let it release pressure naturally. See Release pressure naturally.
All 2 causes checked. Contact SharkNinja Customer Service: 1-877-646-5288.
Service
If the checks above do not clear it, contact SharkNinja Customer Service: 1-877-646-5288, ninjakitchen.com/support. North America. Source: Troubleshooting Guide; Warranty, pp. 23, 25
Other OS401 problems
- The unit takes a long time to come to pressure3 causes in the manual. First: the time to build pressure varies with the selected temperature, the current temperature of the cooking pot, and the temperature and quantity of the ingredients.
- The time is counting down slowly2 causes in the manual. First: hours were set instead of minutes. While you set the time, the display shows HH:MM and the time changes in minute increments.
- The unit is hissing and not reaching pressure2 causes in the manual. First: the pressure release valve is not in the SEAL position.
- The unit takes a long time to depressurizeThe release time depends on the quantity of food in the unit and varies from recipe to recipe.
Sources
- OS401 Owner's Guide: Foodi 10-in-1 8-QT XL Pressure Cooker. SharkNinja Operating LLC. Document OS401_IB, revision MP_REV_Mv12, 25 pages, en. ninjakitchen.com. Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.