Is the remote plipper infra-red? If so, try pointing it at a digital camera to verify that it is working (you'll see the infra-red sensor flashing if it is). Another way is to hold it up against a portable radio tuned to AM, but not on a station (you'll hear blips or beeps coming out the radio speaker if it is working)
i try to lock door manuely or from the inside it doesnt activate central locking , the key ive got is a spare as no infa red on fuse looks fine (fuse 14)
I have a very similar problem. My door locks are all going crazy (So I pulled the fuse and use the key manually). But I also have a dead radio. None of the other posts seem to mention that.