The storage function is not designed to work on its own. So if you are pressing it to do a separate cycle for just storage, the machine will not operate.
The UV sterilizer is designed to only run storage for items that have been sterilized or dried first. The only way to do that is to push the storage button after the sterilizing button, dry button, or UV button is pressed and in operation as well. This ensures that random items are not just placed in the unit to store.
Once the sterilization cycle is complete, the storage cycle automatically activates 1 minute UV every 2 hours for total of 4 cycles.