Feed the drainage and supply hoses through the hole under the sink. Then gradually slide the dishwasher into the cabinet while pulling on the hoses under the sink to take up any slack. This helps avoid kinking the hoses or trapping them beneath the dishwasher.
Waste spigot under sink is clogged.
Drill out the waste spigot under the sink.
IE
Water supply line kinked under dishwasher.
Feed the drainage and supply hoses through the hole under the sink. Then gradually slide the dishwasher into the cabinet while pulling on the hoses under the sink to take up any slack. This helps avoid kinking the hoses or trapping them beneath the dishwasher.
House water supply not turned on.
Turn water on. Water pressure may be too high or too low.