Display shows CLn or CLEAN and machine beeps, brew will not start or stops shortly after starting.

Safety first: Unplug the coffee maker and let it cool completely before handling any internal parts.

Run a full descale cycle:

• Mix a solution of equal parts white vinegar and water (or use Ninja-branded descaling solution per bottle instructions).
• Fill the water reservoir to the MAX line with the solution.
• Place an empty carafe on the warming plate and ensure the brew basket is empty (no coffee grounds).
• Plug in the unit, power it on, and select the CLEAN or DESCALE cycle (refer to your specific Ninja model instructions).
• Allow the full cleaning cycle to run without interruption. This may take 45–60 minutes.

Rinse cycle:

• After the cleaning cycle completes, discard the solution from the carafe.
• Rinse the water reservoir thoroughly and fill with fresh water only.
• Run at least 2 full brew cycles with plain water to flush out any remaining vinegar or descaler.

Clean brew components:

• Remove and wash the brew basket, permanent filter (if equipped), and carafe with warm soapy water.
• Inspect and gently clean the water outlet and showerhead area with a soft brush or cloth.

If the CLn/CLEAN message remains after a full descale and rinse, repeat the descale once more. Persistent messages may indicate a faulty flow or temperature sensor and require professional service.