What is the most common reason a sump pump fails 10

https://thewhysumppumpsfaildigest.greyhavendaily.com/posts/understanding-why-sump-pumps-fail-and-how-to-prevent-basement-flooding

The most common reason a sump pump fails is a stuck or clogged float switch, which prevents the pump from turning on or off at the right water level. Debris, mud, or mineral buildup can jam the switch, causing the pump to run continuously, burn out, or not activate at all. Regular cleaning and occasional replacement of the float assembly are key to avoiding sudden basement flooding.