Check out the Ninja support site for some guidance on common issues. It's also possible to submit a ticket through the Ninja support site if you have a query. Alternatively, you can call Ninja customer service telephone support at 0800 862 0453. The phone line is open 8am to 8pm Monday to Friday, between 9am and 7pm on Saturdays, and 10am and 6.30pm on Sunday and UK bank holidays.