What is the most common reason a sump pump fails 17

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. Over time, debris, dirt, or mineral buildup can jam the float, preventing it from moving freely and triggering the pump to turn on when water rises. This often leads to a flooded basement, especially after heavy rain when the pump is needed most. Regular cleaning and checking the float mechanism can help avoid this issue.