What Is a Drain Pump?

The drain pump pushes used water out of a dishwasher or washing machine at the end of a cycle, sending it out through the drain hose. It's a small motor-driven pump, usually mounted at the bottom of the appliance where it's exposed to whatever debris makes it past the filter.

A drain pump most often fails from a clog — a piece of glass, a coin, or built-up lint jamming the impeller — rather than the motor itself wearing out. A cycle that ends with standing water still in the tub or dishwasher basin is the clearest sign to check the pump and its filter before assuming a bigger fault.

Frequently Asked Questions

What usually causes a drain pump to fail?

More often a clog than a worn-out motor — a piece of glass, a coin, or built-up debris jamming the impeller is a more common cause than the pump simply wearing out.

Is standing water in my dishwasher always a drain pump problem?

Not always — a clogged filter or a kinked drain hose can produce the same standing water, and both are worth checking before assuming the pump itself has failed.