No, you should never run your residential dishwasher while the kitchen sink is clogged or backing up. Because standard dishwasher drain hoses route wastewater directly into the garbage disposal inlet or tailpiece branch under your kitchen sink, an active sink clog means wastewater has nowhere to escape. Running the dishwasher will cause dirty, soapy water to flood backward up through your sink drain or overflow into the bottom of the dishwasher tub. You can troubleshoot plumbing backups safely. You can verify that your corrective action is successful when clearing the kitchen sink clog completely first ensures that dishwasher wastewater can evacuate freely without causing hazardous kitchen overflows.
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