Do water pumps fail suddenly?

Condensate pumps and residential water pumps can indeed fail suddenly without much advance warning, often catching homeowners off guard during peak cooling seasons. Sudden failure is frequently triggered by an electrical power surge that fries the internal motor windings, a mechanical seizure caused by rust or worn-out bearings, or the plastic float switch jamming abruptly in the "on" position due to thick slime and algae buildup. When a pump fails abruptly, it loses its ability to expel condensation, causing water to back up rapidly in the reservoir tank and trigger safety overflow switches or flood your floor. You can troubleshoot by testing electrical voltage with a multimeter. You can verify that a sudden failure has occurred when power reaches the unit, but the motor refuses to spin or pump water, requiring an immediate replacement part.