Why my fridge freezer keeps beeping four hort beeps

Temperature alarm
If the temperature becomes too warm, an alarm will sound and the temperature display will flash. The temperature the appliance is set at will determine when the alarm is triggered.
The alarm will sound and the display will flash under the following conditions:

• - whenevertoomuchwarmairflows into the appliance, for example when food is being loaded, re-arranged, or taken out.
• - wheneverlargeamountsoffoodare being frozen at once.
• - whenevertherehasbeenalengthy interruption of the power supply. Door alarm
  If the appliance door is left open for longer than approx. 60 seconds, the alarm signal will sound.

Switching the alarm system ON
The alarm system is always active. It does not need to be switched on manually.
Switching the alarm OFF early
Once the set temperature has been reached in the freezer section, the alarm signal stops and the temperature display stops blinking. If the alarm signal bothers you, it can be switched off early.
^ Press the alarm off button. The alarm signal will stop. The temperature display will continue to blink until the set temperature has been reached. The display then stops blinking, and shows a steady reading. At this point, the alarm system is ready again if needed.