Renault Megane Central Locking

Hi folks. Need some help here. Have a 05 Renault Megane, trying to get a few things sorted out with it. The central locking is giving me problems. (a French car with electric problems???😱) It locks on the key, and interior button, all except the drivers door..... Other 3 lock fine, but I don't know why the drivers door wont lock. I checked all fuses, replaced the wiring loom in the door, (it needed replacing after the previous owner decided to try and mend it himself) and the central locking module on the door itself. It clicks when I press the button, but doesn't engage???? Any advice appreciated. Can't afford an auto electrician, as on a very tight budget, so hoping it may be something simple. Thanks.