Grundig KD-218A Bedienungsanleitung Seite 13

1.5 FAULT WARNINGS AND HANDLING
1.5.1 Sensor fault warning and handling
If there is fault in the sensor or circuit, fault warning will be given
within 3 minutes. Fault warning will be made at least once every
minute until the fault is eliminated. When fault warning is given, there
may be open circuit or short circuit in the sensor. Or there may be
electronic damage. Volatile gas like ethyl alcohol may affect the sensor
and cause temporary fault. In this case, please replace the product
with a new one. Then power off the damaged unit and put it in clean
air for 24 hours, and it will return to normal. If the unit can't recover
after being placed in clean air for 24 hours, that means permanent
damage. Please don't use the product any more. Don't repair it
yourself or send to the service point that is not authorized by the
manufacturer.
WARNING :
When the alarm is damaged permanently, please stop using it.
Don't repair it yourself or send to the service point that is not
authorized by the manufacturer.
1.5.2 Low battery warning and handling
When the detector is in normal operation, battery capacity is checked
every minute. When the voltage is less than 3.6V, low battery warning
will be given, the LCD display will show condition D as specified in
Section 1.3.1.4. When low battery warning commences, batteries are
only capable of giving low battery warning for one month, or giving
alarm warning for a few minutes. So please replace the AA LR6
batteries as soon as possible.
IMPORTANT : When you hear one beep every minute and see
condition D on the LCD display, please replace the LR6 AA batteries
immediately. Otherwise, the detector may not work properly, which will
threaten your health.