Dishwasher Won't Drain: Troubleshooting Guide
Fix standing water in your dishwasher with this step-by-step guide to common drainage problems.
Safety Warnings
- Disconnect power before removing any components
- Have towels ready - standing water may spill when accessing the drain
Tools Needed
Step-by-Step Instructions
Remove Standing Water
Before diagnosing, remove standing water with towels or a wet/dry vacuum. This allows you to inspect the drain area and prevents water from spilling during repairs.
Check and Clean the Filter
Remove the bottom rack and check the filter assembly. Remove any food debris, broken glass, or foreign objects. A clogged filter is the most common cause of drainage issues.
Inspect the Drain Hose
Look under the sink where the drain hose connects to the garbage disposal or sink drain. Check for kinks, clogs, or disconnection. The hose should have a high loop to prevent backflow.
Check the Garbage Disposal
If connected to a disposal, run it to clear any blockages. New disposals often have a knockout plug that must be removed where the dishwasher drain connects.
Clear the Air Gap (if equipped)
The air gap on your countertop prevents backflow. Remove the cap and clean out any debris. A clogged air gap can cause drainage problems or water backing up.
Run the Disposal/Clear Sink Drain
Sometimes a clogged kitchen sink drain affects dishwasher drainage. Run the disposal and ensure the sink drains properly before running the dishwasher again.
Listen for Drain Pump Operation
Start a drain cycle and listen for the drain pump. You should hear a humming sound. Complete silence may indicate a failed drain pump.
When to Call a Professional
- Drain pump doesn't run at all during drain cycle
- Pump runs but water doesn't drain (pump failure)
- Check valve is stuck and preventing drainage
- Drain hose connection inside dishwasher needs replacement
- Control board isn't initiating drain cycle
Still Having Issues?
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