Depending on which step is causing the hiccup during the installation process, you may need a new part, a plumber, or an electrician. Is that correct? You should call a plumbing professional. It is an investment to own a dishwasher. To get the most out of it, and to ensure it's working correctly, you need a licensed plumbing professional to look at it.
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HomeX virtual experts will assess your issue (for free!) and can resolve simple problems.