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Small amounts of delicate frost will often appear on the basket fronts if the doors of the appliance are left ajar for any length of time.
Avoid leaving the doors open for longer than is absolutely necessary and also remember to cover all food and liquids either in a bag or other plastic container. You must also always use the genuine ice cube tray inside an Hotpoint frost-free appliance, which has a fitted lid to keep the moisture from entering the system.
If you need further assistance please call Hotpoint customer service on 0344 822 4224.