Replace the battery for power failure alarm every 3 years (when “_F1” and chamber temperature is
displayed alternately to ensure the alarm is operated in the event of power failure. Contact our sales
representative or agent for the replacement of battery when “_F1” and chamber temperature is displayed
alternately. The alarm function (blink of alarm lamp, sound of alarm buzzer) will not operate when the
battery for power failure alarm is flat. The alarm lamp blinks and the alarm buzzer sounds by the battery
for power failure alarm. The regular replacement of the battery for power failure alarm is important to
prevent the rise of chamber temperature in the case of unexpected situation