Mazda 3 1.6 BK rear screen washer not working

Help please! My rear screen washer has stopped working. Wiper still works thankfully. Front screen and headlight washers are all working fine and I can't see any leaks from under the car, can't hear the pump engage and there's no blockage in the nozzle. I was wondering if anyone had the same problem and managed to fix it? Or if there's something I can do to investigate the problem? Is there a fuse or something. Any help would be appreciated. Thank you! ☺