HI all, I have a problem with my AC it keep blowing the 3amp fuse I have replaced it but after a min or 2 it blows again I have measured the transformer Volt. To be at 27.8V I know it's a 24V tramsformer now could this be why its blowing the fuse or it doesn't really matter that its 3V over...

Thanks '
Je

The voltage is not the problem. You have a short in the wiring somewhere or a low voltage control is going bad causing enough draw to blow the fuse. If you have a meter you can track the short down if not call service.