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Thanks for the suggestion. It bugged me all day long and I decided that as nothing appeared wrong it must be the battery in the control box as I disconnected the siren box and linked ot out . I had tested the battery in the control box with a meter and loaded it and retested and it still showed...

My Scantronic 9452 has been perfect for about 15 years then suddenly the service and tamper light appeared. I clear it but when you set the alarm it starts to work but after about 10 sec the tamper comes on. I have checked every pir hard wired them in the control box but no change.It does not...