Hisense PureFlat RB22A2FSE User's Operation Manual page 16

"Door Open Alarm"
If the fridge door is opened for longer than
2 minutes, the control panel will
display "dr", the " " icon will blink and
the buzzer will sound 3 times every
minute for 8 minutes.
Pressing and holding " " and " " keys
at the same time for three seconds
during door alarm, the " " icon will be
on and buzzing will stop. Closing the
fridge door, the " " icon will go off and
buzzing will stop.
Demo mode
Demo mode is for store display, and it
prevents the refrigerator from generating
cool air. In this of Cooling Off Mode, the
refrigerator may seem like it is working but
it will not make cool air.
If you enter the Demo mode, the
temperature area will show " ". To switch
off Demo mode, press and hold " " and
" " keys at the same time for 5 seconds
and the buzzer gave a long sound.
NOTE: The Demo Mode stays on even if the
refrigerator powers off. If the consumers
enter the mode with unintentional
operation, you should exit as soon as
possible, since the refrigerator will not cool
in this mode, which will cause the food
going bad.
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