Oh dear, I'm sorry to hear that! Your statement is not entirely correct - of course you can make use of your 24-month warranty, this appears to be a defect. You can initiate the service case directly via your customer account, alternatively our customer service will be happy to help you: https://helpcenter.galaxus.ch/hc/de/requests/new

Hello Brunner01 The mattress does not have a mouth valve like an air mattress or similar. The motor sucks in the air through a fairly large opening, so I don't think you can do it by hand. But the deflation works without electricity.