A dishwasher may fail to drain properly due to various reasons. Here are some common causes and troubleshooting steps you can take:
Clogged filter: Check the dishwasher's filter or strainer for any debris or food particles that may be blocking the drainage. Remove the filter, clean it thoroughly, and reassemble it. Refer to your dishwasher's manual for instructions specific to your model.
Blocked drain hose: Inspect the drain hose connected to the dishwasher. Ensure it is not kinked, twisted, or clogged. Detach the hose and check for any obstructions. Use a long, flexible brush or pipe cleaner to clear any debris. Additionally, check if the hose is installed at the correct height, as improper installation can prevent proper drainage.
Air gap issues: If your dishwasher has an air gap installed, it could be the source of the problem. The air gap prevents water from the sink drain or garbage disposal from flowing back into the dishwasher. Check if the air gap is clogged by removing the cover and cleaning it. Refer to the dishwasher's manual for instructions on accessing and cleaning the air gap.
Garbage disposal connection: If your dishwasher is connected to a garbage disposal unit, ensure the knockout plug inside the disposal connection has been removed. If it's still in place, it can prevent proper drainage. Refer to the garbage disposal manual for instructions on removing the plug.
Faulty drain pump or motor: A malfunctioning drain pump or motor can cause drainage issues. If you've checked all the above steps and the dishwasher still doesn't drain, it may require professional repair or replacement. Contact a qualified technician or the manufacturer's customer support for assistance.
Remember to always consult your dishwasher's manual for model-specific instructions and safety guidelines before attempting any troubleshooting or repairs.