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Thanks Alarm Engineer. I have set the tamper off before when moving one PIR for decorating purposes. It was reset with my user code and hence no ADT engineer code seemingly required. I think as you suggest swapping them live seems to easiest thing to do, just setting off the internal tamper. I...

Hi, I have inherited a Modern 3200 alarm in my house purchase. I understand this is actually a Scantronic 9800 rebranded. It works well. Anyway, I simply want to replace the yellow discoloured, plaster covered PIRs with new clean white ones. Now I only have the user code. The previous...