Lectrician
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You can short out the NC terminals inside the PIR which will prevent the PIR signalling an alarm. This will prove if it is the PIR that is faulty, or the wiring/panel. Start with doing that, and then we can advise further.
When you remove the PIR cover, the tamper alarm will go off, which can be reset with the user code, unless set for engineer reset only, but as you have the engineer code, you're fine.
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