A dishwasher works by allowing water through an inlet valve. This water circulates with dishwasher detergent to clean your dishes and drains the dirty water at the end of the cycle.

Common problems of a broken dishwasher:

Dishwasher is not draining:

  • When your dishwasher does not drain the water, the first thing to do is to check the drain line located underneath the sink. Most times dirt accumulates in the drain hose causing the dishwasher not to drain properly. Clean the drain line from debris and the dishwasher should start draining properly again.
  • If the dishwasher drain hose is clean, then inspect the drain pump for debris. If debris is in the pump, this can cause your drain pump motor to over heat and stop pumping out the water. If no debris is found and the dishwasher is still not pumping out the water, then test the pump for continuity and voltage. If there is continuity and voltage then replace the pump.

No water coming in:

  • If the dishwasher does not bring in any water then you will have to test the inlet valve to make sure it is getting power. First, shut off the power to the dishwasher and disconnect the wires connecting to the inlet valve. Set your volt meter to the continuity setting and place your leads on the inlet valve terminals. The reading should show a number or beep of your volt meter has this function. For the next test, turn the power to the dishwasher on and set your meter on voltage settings. Place your meter leads on the 2 wires connecting to the terminals of the inlet valve and press start to begin a cycle. You should have a reading of 120v or close to it. If both these tests do not check like mentioned, then the inlet valve will need to be replaced. If you are not getting 120v to the inlet valve, then the power board would need to be replaced since it’s not getting any power.
  • If the inlet valve is ok and water still does not come in, check the base of the dishwasher for water leaking. You want to check if the float switch is stuck on a “up position” thus not allowing any more water to come into the dishwasher because of water in the base. Dry the water and turn the machine on.

Dishwasher does not start:

  • If the dishwasher does not start, check the thermal fuse for continuity. The thermal fuse shuts power off to the dishwasher to prevent it from over heating. Test the fuse using a volt meter for continuity and replace it if needed.
  • The door switch could also prevent the dishwasher from starting. If the dishwasher switch is defective it can cause the dishwasher not to start. To test the door switch, place your volt meter on the continuity settings and test the switch while pressing it. As you press the switch you should have continuity, while letting go of the switch button there should be no continuity.
  • If all of these tests check ok, begin a cycle and check to see if voltage is present. If no voltage is present then the main control board would need to be replaced. Also check to see if power is present at the wall to make sure there is no electrical issues in the house.

Dishwasher not cleaning properly:

  • First, check to see if inlet valve is working and water is coming in. If no water comes in, test the valve for the tests mentioned above.
  • Next, if water comes in, check to see if the spray arms are clogged. If yes, clean them and place them back in place.
  • Next, check the circulation pump and see if it has proper water pressure to circulate and clean dishes.
  • The dishwasher detergent dispenser can also attribute to a dishwasher not to clean properly. During the rinse cycle the detergent dispenser opens up to release the detergent and clean the dishes.

This post doesn’t reflect any of Toronto Appliance Repair views, and is Only for professional recommendation value.

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