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To create a siphon break and remove any chance of dirty sink water or water that backs up into the sink from getting into your dishwasher, your dishwasher drain hose needs to have a high loop or an air gap device as part of its installation. All building codes require at least a high loop. In many places, it’s necessary to install an air gap device to meet the code.

A clogged air gap can cause a dishwasher not to drain. There are, however, other potential issues that can lead to improper drainage. For example, if you have attached the air gap to a garbage disposal and forgotten to remove the knockout plug, wastewater may backflow into the dishwasher. Check that the air gap is installed properly, and then look for clogs in the air gap and dishwasher filters. 

Not all dishwashers are 60cm wide, but that tends to be the most common size. 60cm translates into roughly 24 inches, with most home dishwashers being between 22 and 24 inches wide. There aren’t metrics available but it’s been our experience that over 90% of household dishwashers in North America are around 24 inches wide by 24 inches tall.

Water may linger at the bottom of your dishwasher if the cycle is interrupted or if there’s a clog in the system. Begin by pressing and holding the cancel button to ensure the cycle finishes. You may need to check the filter, hose, air gap, and garbage disposal for clogs if it still doesn't drain. If the problem persists and there is no visible clog, a professional will need to assess and fix the problem for you.