Can someone please help explain why this may have happened. My econ 7 storage heater stopped working, when I opened up the fuse box I saw the entire fuse housing and part of the consumer unit melted. This is an old school main board that uses fuses that have wires that you screw in. I will now have to replace the whole board now as you can see its severely damaged. My question is, if the storage heater was drawing a higher load of electricity due to some problem, why didnt the fuse wire just pop to cut of supply of electricity like its suppose to ? Would really appreciate your advice please