A Dishwasher Troubleshooting Guide (Part Three) - Parker & Sons

If you have been following along with our dishwasher troubleshooting guide, by now you have checked that your dishwasher is turning on properly and that it is filling properly. We are checking off potential issues one by one. The next major problem you might face occurs when your dishwasher does not drain properly. This can lead to additional problems and even flooding! We typically suggest you contact a service professional if this is the case but feel free to follow our troubleshooting guide first.

Issue: Dishwasher is not Draining


This usually occurs when the house’s drain lines are backed up or when the line is kinked or clogged. It is important to note, if you have recently installed a garbage disposal, make sure that the dishwasher knockout plug has been removed.

  1. First we recommend removing the cover of the air gap at the top of your kitchen sink. Use a wire brush or a drain snake to clean it out and ensure there are noblockages. A blockage here could be impacting your dishwasher’s ability to drain properly.
  2. Some dishwashers have been designed to give you access to the strainer. We recommend shutting off power to the dishwasher before you do this. Disassemble the rotating arm, unscrew the hubcaps, and lift away and clean the strainer.
  3. If the dishwasher is still struggling to drain properly, you should check your home’s drain line for clogs. If the drain line is clogged, the sink will have trouble draining as well. This is an easy way to diagnose the issue.

If the draining issues persist after all of these steps, it is time to contact a professional service person. They will have your dishwasher up and running in no time, restoring your life to normal.

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