What is the best course of action if a 15-ampere fuse blows and continues to blow after replacing it?

When a fuse blows, especially repeatedly after being replaced, it indicates there is an underlying issue in the electrical circuit that needs to be addressed. The correct response is to check the circuit for issues. This could involve inspecting the wiring, connections, or any devices on the circuit that may be causing a short circuit or an overload.

Using a higher amperage fuse is not safe, as it can lead to overheating and potentially cause fires, since the fuse is designed to protect the circuit by breaking the connection when the current exceeds its rating. Similarly, removing all devices from the circuit might not help identify the specific problem, and while it may stop the fuse from blowing temporarily, it does not address the cause of the issue. As for using a different type of fuse, this may also pose safety risks because fuses are designed with specific ratings and characteristics for particular applications, and substituting them can compromise the protection they provide. Thus, checking the circuit for issues is the safest and most effective approach to diagnosing and resolving the problem.