You don't give any information about the make & model of the machine, but if the fuse keeps blowing, it's probably due to a short circuit somewhere in the machine. It could be as simple as a cut in part of the wiring, allowing the copper cable to touch another metal part, or it could be the compressor or pump wiring shorted out. If you don't have the experience or equipment to isolate the short, your best bet is to call a service engineer.