Well I think they have built the cupboard around the unit...it was a ballache to get the cover off!
I've found which spur it's on so can safely kill mains when replacing battery. Presume they have some flash memory to maintain setting?
Hopefully I can do it tomorrow and report back
I've found which spur it's on so can safely kill mains when replacing battery. Presume they have some flash memory to maintain setting?
Hopefully I can do it tomorrow and report back