I installed a 75,000 btu maxx heater in my garage a couple of weeks ago. The heater has ran great several times. I started it today it ran for about ten minutes and then blew my fuse on my fused switch. I checked all my wire connection they were good. I cannot find any burnt wires. My fan and exhaust motors don't smell burnt. I tried two more fuses they blew. Any one had this problem or have any ideas. thanks