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Yes. I'd prop it though. The 6400 will not know the door is in fact open The system is looking for a change in state from closed to open after the alarm has been set

If you press and hold both red buttons at the same time it will act as a panic alarm and set the siren off wether the system is set or not

Happy to call myself a Yale 6400 “expert” do let me know of any issues you experience with yours guys. David Exley

I’ve installed many 6400 systems. It doesn’t look like the original sticky tape Yale provide. Try fixing with screws or buying replacement bone Fife Yale tape pieces. £5 each pair not cheap I advise you buy a new sensor for £19 Then delete this existing one and add the new one I reckon the...