fuses are an intentional weak link .
passing current in excess of it rating will cause the element to open .
thereby removing power to the affected circuit and eliminating risk of further damage/fire.
the fuse(s) in question indicate what circuitry is involved.
only replace with the same type/rating as indicated .
i.e. DONT put a 20A fuse where it should be a 2
or worse ... a bolt
seen this far too many times by DIYers
