Ninja Foodi Err Code — How to Fix It

What it means

Err is a general error code on the Ninja Foodi that signals the unit detected a fault but cannot assign it to a specific sensor.
It is often a transient error that clears with a power reset.
Common causes include a momentary power fluctuation, a loose inner pot, or an incomplete lid seal.

Affected Models

Ninja Foodi OP300
Ninja Foodi OP400
Ninja Foodi OP500
Ninja Foodi OL500

How to Fix It

Press Cancel and unplug the unit

Press Cancel on the display.
Unplug the Ninja Foodi from the wall outlet and wait 5 minutes.
This clears the unit's error memory and allows the control board to restart cleanly.
Check the inner pot is correctly seated

Remove the inner pot, wipe the base of the pot and the heating plate, then place the pot back in firmly, ensuring it sits flat and centred.
A tilted or misaligned inner pot can cause a general Err.
Verify the lid is locked and sealing ring is seated

Attach the pressure lid and lock it clockwise.
Check the sealing ring is fully pressed into its groove.
An unseated ring or unlocked lid during startup can trigger Err.
Plug back in and run a test cycle

Plug the unit in, add 1 cup of water, and run a short Steam cycle.
If the cycle completes without Err, the issue was transient.
If Err returns immediately, proceed to the next step.
Contact Ninja support

A persistent Err that returns after a full reset points to an internal fault — a failing control board, sensor, or power component.
Contact Ninja at ninjakitchen.com/support.
Under warranty, a replacement unit is usually provided.

Frequently Asked Questions

What is the difference between Err and Er1, Er2, Er3, Er4?

Er1 through Er4 are specific fault codes pointing to a particular sensor or system.
Err is a non-specific catch-all fault that fires when the unit detects something wrong but cannot determine the exact source.
A power reset resolves Err more often than it resolves the numbered codes.