Several factors can contribute to a dishwasher not draining properly and leaving water on top of the dishes. Here are some potential causes to consider:
Clogged drain hose: The drain hose might be obstructed by food debris or other objects, preventing proper water flow. Inspect the drain hose for any blockages or kinks and ensure it is properly connected.
Blocked air gap: If your dishwasher has an air gap (a small device mounted on the sink or countertop), it can become clogged with debris, hindering proper drainage. Clean the air gap by removing the cap and clearing any obstructions.
Clogged filter or drain basket: Dishwashers typically have filters or drain baskets to catch large food particles and prevent them from clogging the drain. If these components are dirty or clogged, they can impede drainage. Clean the filter and drain basket according to the manufacturer's instructions.
Improperly installed garbage disposal: If your dishwasher drains into a garbage disposal, an incorrectly installed or clogged disposal can cause drainage issues. Check the disposal for any clogs or obstructions and ensure the dishwasher drain hose is connected properly.
Malfunctioning drain pump: The drain pump is responsible for removing water from the dishwasher during the drain cycle. If the pump is faulty or damaged, it may not be able to expel the water effectively. A malfunctioning pump might require professional repair or replacement.
High drain loop or air gap installation: Dishwashers require a high drain loop or an air gap to prevent backflow of water from the sink into the dishwasher. If these components are not installed correctly, it can lead to drainage problems. Ensure that the drain hose is positioned properly with a high loop or that the air gap is installed correctly.
If you have tried troubleshooting these common causes and the problem persists, it may be best to contact a professional dishwasher repair service to diagnose and fix the issue.