It not getting the signal from the door switch , when you press lock it will lock everything but then it will double click and unlock everything to let you know something is open like a door /hatch ,which is fine until a switch packs up ,you need a multimeter to check all of the switches !
ferkemall
September 2015
Check for broken wiring between door and door pillar.
cdc
September 2015
I can answer this question...
central locking double clicks won't lock Peugeot 307hdi?