How to fix a dishwasher that isn’t draining water completely?

 

Check for Blockages in Dishwasher Filter and Drain Basket

 

The most common reason for a dishwasher not draining completely is a blockage within the filter or drain basket. Food particles, grease residue, and debris can accumulate over time, obstructing water flow. Thoroughly inspect and clean the filter or drain basket located typically at the bottom of the dishwasher. Follow these detailed steps:

• Locate the filter (usually below the dishwasher spray arm or at the base).
• Gently twist and remove the filter assembly.
• Clean it under running water using a soft brush to remove particles.
• Clear away debris from the drain basket and around the drain area.
• Once clean, reinstall the filter securely into place.

Regular cleaning of these parts can significantly improve water drainage and the overall functionality of the dishwasher.
 

Inspect the Dishwasher Drain Hose

 

Another frequent culprit of incomplete dishwasher drainage is the drain hose becoming blocked or kinked. Here is how to inspect and fix potential drain hose issues:

• Turn off power to the dishwasher by unplugging it or switching off the circuit breaker.
• Carefully pull the dishwasher from its location, ensuring you don't strain or damage the hose connections.
• Locate the flexible drain hose at the back or underneath your dishwasher.
• Check thoroughly for kinks, twists, or blockages inside the hose; food debris can clog this hose over time.
• If necessary, detach and thoroughly rinse the hose, or replace it if cracked or damaged.
• Securely reconnect the drain hose after checking it's clear and ensure smooth, even alignment without sharp bends.

 

Examine Your Garbage Disposal and Sink Drain

 

Dishwashers commonly drain into the garbage disposal, and clogged disposals or sink drains can cause water to back up and prevent proper drainage of the dishwasher. To remedy this:

• Run your garbage disposal briefly before restarting the dishwasher cycle. Doing so dislodges and flushes out any accumulated debris.
• Also, ensure the disposal knockout plug is removed. Especially if your garbage disposal has been recently installed, verify that the dishwasher drain hose connection knockout plug inside is removed. These knockout plugs are sometimes inadvertently left in place.
• Inspect and clear your sink drain of any blockages to enhance drainage performance, particularly for kitchens frequently used for cooking and food preparation.

 

Verify the Dishwasher Air Gap

 

If your dishwasher utilizes an air gap (a small metal or plastic cylinder installed beside or near your kitchen sink), a blockage could prevent proper drainage. Check the air gap with the following steps:

• Remove the cover of the air gap (usually by unscrewing it) and inspect closely.
• Clear away dirt, food particles, or residue buildup in the air gap.
• Flush the air gap thoroughly with water to clear debris.
• Reassemble it carefully, making sure it's firmly secured.

 

Check the Dishwasher's Drain Pump

 

The drain pump, responsible for pushing water out of the dishwasher during the draining cycle, may be defective or clogged. Check these steps to ensure its proper functioning:

• Before proceeding, turn off the dishwasher's power completely for safety.
• Locate the drain pump (typically underneath the dishwasher, accessible once you remove lower dish racks and dishwasher panels).
• Check visually for foreign objects or fragments causing blockage around your drain pump.
• Inspect the pump impeller blades for damage, debris, or limitations in motion.
• If damaged or broken, you may need to replace or have a professional technician install a new pump.

 

Inspect Dishwasher Timer or Control Panel Issues

 

Occasionally, electronic issues within the timer or control panel could stop the dishwasher from draining completely. Troubleshooting these can be complex and should typically be addressed by a professional dishwashing machine technician to be safe. Technicians often recommend diagnosing control panel problems using specialized hands-on electrical inspections and part replacements if needed.
 

Know When to Call in a Professional

 

If you have tried these steps, and the dishwasher still fails to drain completely, it may be wise to turn to professional dishwasher repair services. Certified experts, such as the technicians at Hoffmann Brothers, a reputable residential and commercial service provider in St Louis and Nashville, can efficiently identify and resolve even complex dishwasher issues you may face.

Consistently maintaining your dishwasher according to the manufacturer's recommendations, including regular cleaning and inspections, is the best practice to avoid drainage problems in the future.