Display shows E01 and brewing will not start or stops immediately.

Safety first: Unplug the coffee maker and allow it to cool for at least 30 minutes before proceeding.

Check water supply:

• Ensure the water reservoir is filled above the minimum line and properly seated.
• Inspect the reservoir outlet for blockages and clean if necessary.

Descale the system:

• Once cooled, run a full descale cycle using a 1:1 vinegar and water solution or Ninja-approved descaler.
• This helps remove scale from the heating element and internal tubing that can cause localized overheating.

Reset and test:

• After descaling and rinsing, unplug the unit again for 5 minutes, then plug back in.
• Run a small water-only brew to test.

If E01 returns even with adequate water and after descaling, the temperature sensor or thermal fuse may be faulty and should be tested and replaced by a technician.