clio 2 phase 1 x reg central locking problem

Hi all, i have a remote central locking problem. I got the car in november and the remote locking worked, then in janurary it stopped working. Now i manually lock each door as it wont lock both doors or boot manually either. The button inside next to the cig lighter locks and unlocks all doors and boot fine. In Febuary the car wouldnt start, had new battery put in fob and starts fine now, but still remote locking wont work. Ive read about the sensor next to the sunroof but mines a manual sunroof with no sensor.



What could the problem be? Please help.