Why is there a temperature alarm sounding on my freezer compartment?

Bosch Bosch Refrigerator (9001065561_C) ·

The temperature alarm (intermittent signal) activates when the freezer compartment becomes too warm. It may also be triggered without risk to frozen food when the appliance is first switched on, when large quantities of fresh food are added, or when the freezer door has been left open too long. Press the alarm button to display the warmest temperature reached and switch off the warning signal. (Page 11)

Source: Bosch Refrigerator (9001065561_C) Manual, Page 11

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