Garbage disposal runs but dishwasher does not drain through the disposal connection.

Safety first: Turn off power to the disposal and unplug the dishwasher before working on hoses.

• Check knockout plug: If the dishwasher is newly installed, remove the hose from the disposal's dishwasher inlet. Insert a screwdriver into the inlet and tap with a hammer to knock out the internal plastic plug. Retrieve the plug from the grinding chamber.
• Clear spigot: Inspect the inlet spigot for food debris or scale. Clean thoroughly.
• Inspect hose: Ensure the dishwasher drain hose is not kinked or crushed and that it rises in a high loop before connecting to the disposal to prevent backflow.
• Test drain: Reconnect the hose securely with a clamp, then run a dishwasher drain cycle and observe for proper flow.