Hi,

Many thanks for all the info guys. just one last question, do I need to put the alarm into any sort of maintainance mode before changing the PIR or do I just go ahead and change it?

Many thanks

Only if you have the engineers code.

If not open pir lid . Go put in code to silence.

When you change do not short the wires together or you will blow a fuse and have to open the panel.

When the cover is off and before you remover the wires, write down what goes where, so + - TAMP TAMP NC C

Then work out where they go with the new.

Will save you a lot of headaches.

Fit the new detector, if your lucky the mounting holes will match but only if your lucky.

Refit and connect lid back on, back to panel insert code to remover tamper, the guardtec easiser way is to try and set then unset.

Good luck