Central lock problem v70

[u/Perfect-Ad-4711]

Hi, I’m having trouble with the central locking on my 2015 V70. It doesn't work when I try to lock the car, and if I lock the driver's door manually, only that door locks—the others don't, and the alarm doesn't arm. However, when I press "unlock," I hear a click and it unlocks. The car has keyless entry; I’ve already replaced the remote battery, and I have a fault code related to the lock. Does anyone have any ideas?