Why does Fuse blows when heater is turned on?

A fuse blows when a heater is turned on typically due to an overload or short circuit. If the heater draws more current than the fuse can handle, the excess current causes the fuse to melt and break the circuit to prevent damage. Additionally, a short circuit within the heater's wiring or components can create a sudden surge in current, leading to a blown fuse. Regular maintenance and checking for damaged wiring can help prevent this issue.