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Good morning. My name is ***** ***** I'll be assisting you with your dishwasher today. The error you're getting is i20 and it means there is a drain issue. You'll need to disconnect the drain line below your dishwasher and blow through it all the way up to your stand pipe or disposal under your sink to make sure it's clear. If it's not then try to track down the clog and clean it out. Otherwise, if it's clean you'l need to remove the drain pump below the dishwasher and check for any debris hitting the drain pump impeller. If you find nothing, then replace the drain pump.
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alright, I wouldn't do anything you're not comfortable with but at least you have an idea of what is wrong now. I do wish you only the best.