Hi,
If changing the battery doesn't help, as there is a 10 year limited manufacturer's warranty on the scales contact the manufacturer as per the warranty statement that should have come with the scales.
If you cannot find it here is a link to the [http://www.awscales.com/support/terms-and-conditions|manufacturer's warranty]. It details what you have to do to make a claim for a warranty refund or repair. Scroll down to ''returns ''and ''refunds''