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To replace the batteries make sure you follow the instructions provided in
section 13.
For safety reasons, a particular procedure must be followed when replacing the
batteries,
if the smoke detector is part of a ‘HMS 100’ radio system (the central
unit stores the battery level as a ‘fault’ (= ‘Störung’)).
Note that the ‘HMS 100 Z’ should first be set to the maintenance mode
before its batteries can be replaced!
• If the batteries are in good condition, then the smoke detector is likely to be faulty and must
be replaced.