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
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...