Check that the alarm plug pack is connected to a working power point and switched on. Hopefully this is next to the alarm box. Otherwise you will need to find it, possibly in roof space, but as this is an apartment you may not have a roof space.
Or the alarm plug pack has died and needs replacing.
Date and time will need to be set, refer to user manual. Might also be a fault icon showing, refer to user manual for how to check faults.
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