Silencing DSC PC1565-2P alarm after power loss

Given: DSC Classic PC1565H-2P alarm system with PC1555RKZ PowerSeries 8-Zone LED keypad. The battery is many years old.
Power supply to the building is lost. After it is restored, the alarm begins to howl. Various key combinations you normally use do not help to silence it.
Solution: Trip the fuses off and back on again. Then run to the unit and enter your password. You might need to enter it twice.
The solution actually worked but the details are not fully clear, as it was a unique case.

If after a while it starts beeping on motion, try entering [*][4] (if needed, followed twice by the code).

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