What usually fails on a dishwasher?


Editorial team Published on

The parts that usually fail on a dishwasher are the drain pump, water inlet valve, door latch, and circulation motor/pumps.

Here are the most common mechanical and functional failures:

1. Drainage System and Pumps

  • Clogged or stuck drain pumps: Small pieces of broken glass, bone fragments, or toothpicks easily get jammed in the impeller, causing the motor to hum or fail to pump water out.
  • Dirty filter mesh: Food grease and calcium scale build up on the fine filter screen, restricting water flow and reducing cleaning power.
  • Circulation pump wear: Over years of use, wash motor bearings wear out or seals dry up, leading to loud buzzing, leaks, or a failure to spray water.

2. Water Filling Issues

  • Water inlet valve clogs: Hard water mineral scale or sediment blocks the tiny valve that lets water into the machine, causing the dishwasher to run dry or fail to start a cycle.
  • Float switch failure: A stuck or broken float switch falsely signals that the tub is already full, stopping the unit from taking in water.

3. Electrical and Door Components

  • Faulty door latch assembly: The microswitch inside the door latch breaks or fails to click securely, preventing the dishwasher from recognizing that it is closed.
  • Blown thermal fuse: Power surges or overheating can blow the thermal fuse on the control board, leaving the control panel completely dark and unresponsive.