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I have some expensive quartz gem conglomerate floor tiles, made by Compaq (a Spanish company), and bought from Pilkington's near Manchester. The tiles are anthracite in colour, having a black shiny appearance enhanced with sparkly metallic-looking particles. I've received conflicting...

In brief, before expanding upon detail: The Control Panel indicates that all PIRs are constantly in Active status, despite there being no external condition (i.e. movement in front of sensor) and no red light showing, at any PIR. I'm in the dark as to the technical reason for this condition and...