C&K 800L link for memory reset

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8 Jul 2025
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Notts
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Hi all, just moved into this house with a decommissioned 800L system in place, was only decommissioned by HA due to tenant not disclosing the code before leaving.

I'm quite handy with tools and have a bit of experience with alarms so I'm swapping out the battery and a handful of PIRs after I've tried to get some power in it - But I want to fully factory reset the panel and I know how to do it as I've researched the Engineer's Manual extensively...

However I can't find the link to put on the tabs to factory reset the panel (pictured) does anyone have any solutions? Can one buy these Links?

Thanks folks and PIR recommendations gratefully received. I know the panel is ancient but I can't replace it I don't have the skills or cash.
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Use a screwdriver blade short out the two pins restore the power to the alarm codes will be 1234 and 7890 all other programming will be the same ….alternatively if there are some pirs on the system one may have a jumper link inside you could borrow ,
 
Also can anyone identify this PIR? Odd looking thing, no screws to undo it and it's caked in paint so I'm worried if I force it open like a snap on one it will fall apart (not that it matters like)
 

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C&k 415 ….plastic lug on top you prise it open ….it will break …lol…I use both thumbs at bottom corners and push up to unhook the bottom
Thanks Sparky, came apart in once peice thankfully. This is the inside, am I right in thinking this is just able to replaced with a bog standard 6 terminal PIR? Was looking at some Bosch Blue Line Gen 2 Pet Friendly models to replace them.
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