What you will notice
A sump pump sits in a pit in the basement floor. Water from the ground or a drain fills the pit, a float rises, and the pump turns on. Here is what a problem looks like.
It runs every few minutes for days
Even after the rain stopped.
It runs in dry weather
No rain or melt, but the pit keeps filling.
It clicks on with no water
The pump runs, but the pit is nearly empty.
It hums but no water moves
The motor runs and the level does not drop.
Water runs back into the pit
When the pump shuts off, you hear water flow back.
The discharge line is frozen
In winter, water backs up because the outside pipe is blocked.