Ninja OS401 the unit takes a long time to come to pressure
Cause 1 of 3The time to build pressure varies with the selected temperature, the current temperature of the cooking pot, and the temperature and quantity of the ingredients. Source: Troubleshooting Guide: Why is my unit taking so long to come to pressure?, p. 22
First checkCheck that PRE is on the display, which shows the unit is building pressure.
Causes and checks
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. Source: Troubleshooting Guide: Why is my unit taking so long to come to pressure?, p. 22
- Check that PRE is on the display, which shows the unit is building pressure.
The silicone ring is not fully seated and flush against the lid. Source: Troubleshooting Guide: Why is my unit taking so long to come to pressure?, p. 22
- Check that the silicone ring is fully seated and flush against the lid. If it is installed correctly, you can tug lightly on the ring to rotate it. See Remove and reinstall the silicone ring.
The pressure lid is not fully locked, or the pressure release valve is not in the SEAL position. Source: Troubleshooting Guide: Why is my unit taking so long to come to pressure?, p. 22
- Check that the pressure lid is fully locked. See Install the pressure lid.
- Check that the pressure release valve is in the SEAL position when pressure cooking.
All 3 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 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 pressure lid will not come off2 causes in the manual. First: the unit is not completely depressurized. As a safety feature, the pressure lid will not unlock until it is.
- 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.