Dishwasher Not Draining After Cycle: Troubleshooting Guide
Quick answer
First, check the drain hose for kinks or clogs. Next, inspect the drain filter for debris. If these are clear, you may need to clean the air gap or check the drain pump. Always ensure the dishwasher is unplugged before starting any repairs.
Confirm the symptom
- Dishwasher leaves standing water at the end of the cycle.
- Dishes are not clean due to poor drainage.
- Drain hose is not emptying water properly.
- Dishwasher makes unusual noises during the drain cycle.
- Error code related to draining appears on the display.
Tools and prep
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Prep & safety
- Ensure the dishwasher is completely cooled down before starting any repairs.
- Turn off the power to the dishwasher at the circuit breaker.
- Place a towel under the dishwasher to catch any water that may spill out.
- Gather all necessary tools and parts before beginning the troubleshooting process.
Step-by-step troubleshooting
Check the Drain Hose
Do: Locate the drain hose at the back of the dishwasher.
Observe: Look for any kinks, blockages, or damage.
Means: A kinked or blocked hose can prevent proper draining.
Next: If the hose is clear, proceed to the next step.
Inspect the Drain Filter
Do: Remove the lower rack and locate the drain filter at the back of the dishwasher.
Observe: Check for any debris or blockages in the filter.
Means: A clogged filter can restrict water flow and cause draining issues.
Next: Clean the filter if necessary and proceed to the next step.
Clean the Air Gap
Do: Locate the air gap on the kitchen counter or sink.
Observe: Remove the cap and check for any blockages.
Means: A blocked air gap can prevent water from draining properly.
Next: Clean the air gap if necessary and proceed to the next step.
Check the Drain Pump
Do: Access the drain pump, usually located at the bottom of the dishwasher.
Observe: Look for any debris or blockages around the pump.
Means: A clogged or faulty pump can prevent proper draining.
Next: Clean or replace the pump if necessary and proceed to the next step.
Test the Drain Pump
Do: Use a multimeter to test the drain pump for continuity.
Observe: Check the readings against the manufacturer's specifications.
Means: A faulty pump will not show continuity and needs replacement.
Next: Replace the pump if necessary and proceed to the next step.
Inspect the Drain Valve
Do: Locate the drain valve, usually near the drain pump.
Observe: Check for any blockages or damage.
Means: A faulty or blocked valve can prevent proper draining.
Next: Clean or replace the valve if necessary and proceed to the next step.
Check the Float Switch
Do: Locate the float switch inside the dishwasher.
Observe: Ensure it moves freely and is not stuck.
Means: A stuck float switch can prevent the dishwasher from draining.
Next: Replace the float switch if necessary and proceed to the next step.
Examine the Control Board
Do: Access the control board, usually located behind the control panel.
Observe: Look for any signs of damage or burnt components.
Means: A faulty control board can cause draining issues.
Next: Replace the control board if necessary.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged Drain Hose | Food particles or debris can block the hose, preventing water from draining. | High | Easy | Drain hose |
| Blocked Drain Filter | Debris can accumulate in the filter, restricting water flow. | High | Easy | Drain filter |
| Blocked Air Gap | Food particles or debris can block the air gap, preventing proper draining. | Medium | Easy | Air gap cap |
| Faulty Drain Pump | The pump may be clogged or malfunctioning, preventing water from being pumped out. | Medium | Moderate | Drain pump |
| Faulty Drain Valve | The valve may be blocked or damaged, preventing proper draining. | Medium | Moderate | Drain valve |
| Stuck Float Switch | The float switch may be stuck, preventing the dishwasher from draining. | Low | Moderate | Float switch |
| Faulty Control Board | The control board may be damaged, causing draining issues. | Low | Hard | Control board |
Parts matching
When replacing parts, ensure they match your dishwasher's make and model. Check the user manual or manufacturer's website for specific part numbers.
- Drain hose: Match the length and diameter (e.g., 3/4 inch, 6 feet).
- Drain filter: Match the size and shape specific to your dishwasher model.
- Air gap cap: Match the thread size and type (e.g., 1-1/2 inch, female thread).
- Drain pump: Match the voltage, amperage, and mounting style.
- Drain valve: Match the voltage, amperage, and mounting style.
- Float switch: Match the length, diameter, and mounting style.
Always double-check the part number with the manufacturer to ensure compatibility.
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When to call a pro
- If the dishwasher is under warranty.
- If you are not comfortable performing the repairs yourself.
- If the issue persists after troubleshooting all possible causes.
- If you suspect a gas leak or other serious issue.
- If the dishwasher is making unusual noises or smells.
- If the dishwasher is leaking water excessively.
FAQ
Why is my dishwasher not draining?
Common causes include a clogged drain hose, blocked drain filter, or faulty drain pump. Check these components first.
How do I clean the drain filter?
Remove the lower rack and locate the drain filter at the back of the dishwasher. Remove the filter and clean it thoroughly with warm, soapy water.
What should I do if the drain hose is kinked?
Straighten the hose and ensure it is properly connected to the drain. If the hose is damaged, replace it with a new one.
How do I test the drain pump?
Use a multimeter to test the drain pump for continuity. Follow the manufacturer's instructions for specific testing procedures.
Can I use a shop vac to clear a clog?
Yes, a shop vac can be used to clear clogs from the drain hose or air gap. Ensure the dishwasher is unplugged before using the vacuum.
What if the float switch is stuck?
Try to free the float switch manually. If it remains stuck, replace it with a new one compatible with your dishwasher model.