If water is flowing into your dishwasher via its pop-up drain, there are a few potential causes for this issue. Here are some steps you can take to troubleshoot and potentially resolve the problem:
Check the drain hose: Ensure that the dishwasher's drain hose is properly connected and not damaged. Make sure it is securely attached to the dishwasher and that it is positioned correctly, without any kinks or blockages.
Clean the air gap (if present): Some dishwashers have an air gap installed on the countertop or sink. It prevents backflow by allowing air to enter the drain line. If you have an air gap, detach the top cap and clean out any debris or deposits that may be obstructing the air gap. Reassemble it properly afterward.
Inspect the drain valve: The dishwasher's drain valve is responsible for controlling the water flow. If it's not functioning correctly, it can lead to water backflow. Consult your dishwasher's manual to locate the drain valve and inspect it for any signs of damage or blockage. If necessary, replace the valve.
Check the garbage disposal (if connected): If your dishwasher drain hose is connected to a garbage disposal unit, ensure that the knockout plug inside the disposal inlet has been removed. The knockout plug is a small plastic piece that needs to be knocked out before connecting the dishwasher hose. If it's still intact, remove it to allow proper drainage.
Clear any blockages: If you suspect a blockage in the dishwasher's drain system, try using a plumber's snake or a straightened wire coat hanger to clear any debris or clogs. Insert the tool into the drain and carefully maneuver it to dislodge any obstructions. Be gentle to avoid damaging the dishwasher's components.
Professional assistance: If the problem persists or you're uncomfortable performing these troubleshooting steps yourself, it's advisable to contact a professional appliance repair technician. They will have the expertise to diagnose the issue accurately and recommend the appropriate solution.
Remember to always follow safety precautions, such as disconnecting the power supply and shutting off the water before working on your dishwasher or any plumbing components.