Dishwasher Not Draining in the UK: Fix It Yourself
Quick answer
If your dishwasher isn't draining, first check for a clogged filter or drain hose. Clear any blockages and ensure the drain pump is working. If the problem persists, the pump or float switch might need replacing.
Confirm the symptom
- Water remains in the dishwasher after a cycle
- Dishes are not clean and waterlogged
- Dishwasher makes gurgling or bubbling sounds during draining
Tools and prep
- Screwdriver — To remove panels and access internal components
- Plunger — To unclog the drain pipe
- Bucket — To collect water during cleaning
- Flashlight — To inspect dark areas for blockages
- Wire brush — To clean the filter and drain hose
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Prep & safety
- Unplug the dishwasher to ensure safety before starting any repairs.
- Place a towel or bucket under the dishwasher to catch any water that may spill during cleaning.
Step-by-step troubleshooting
Check the Filter
Do: Remove the bottom rack and locate the filter. Twist or unscrew it to remove.
Observe: Look for food particles or debris blocking the filter.
Means: A clogged filter can prevent proper drainage.
Next: Clean the filter with a brush and water, then reassemble.
Inspect the Drain Hose
Do: Locate the drain hose at the back of the dishwasher. Check for kinks or clogs.
Observe: Look for blockages or bends in the hose.
Means: A blocked or kinked hose can stop water from draining.
Next: Clear any blockages and straighten the hose if necessary.
Test the Drain Pump
Do: Listen for the drain pump during a cycle. You can also check for obstructions in the pump area.
Observe: The pump should run and push water out.
Means: A faulty pump may need to be replaced.
Next: If the pump is not working, proceed to check the float switch.
Check the Float Switch
Do: Locate the float switch near the bottom of the dishwasher. Try moving it manually.
Observe: The switch should move freely and not be stuck.
Means: A stuck float switch can prevent the dishwasher from draining.
Next: If the float switch is faulty, it may need to be replaced.
Examine the Air Gap
Do: Check the air gap on the countertop for blockages. Remove the cap and clean it.
Observe: Look for debris or blockages in the air gap.
Means: A clogged air gap can hinder drainage.
Next: Clean the air gap thoroughly and reassemble.
Verify the Drain Pipe Connection
Do: Ensure the drain pipe is securely connected to the household drain.
Observe: The connection should be tight and free of leaks.
Means: A loose connection can cause drainage issues.
Next: Tighten or reconnect the drain pipe if necessary.
Common causes table
| Cause | Why | Likelihood | Difficulty | Part often needed |
|---|---|---|---|---|
| Clogged Filter | Food particles and debris can block the filter, preventing water from draining. | High | Low | Filter |
| Blocked Drain Hose | A kink or clog in the drain hose can stop water from exiting the dishwasher. | High | Medium | Drain Hose |
| Faulty Drain Pump | A malfunctioning drain pump cannot push water out of the dishwasher. | Medium | High | Drain Pump |
| Stuck Float Switch | A float switch that is stuck can prevent the dishwasher from draining properly. | Medium | Medium | Float Switch |
| Clogged Air Gap | An air gap that is blocked can restrict water flow from the dishwasher. | Medium | Low | Air Gap Cap |
| Loose Drain Pipe Connection | A loose connection can cause leaks and drainage problems. | Low | Low | Drain Pipe |
Parts matching
When replacing parts, ensure they match your dishwasher model. Check the manufacturer's specifications for compatibility.
- Filter: model number and size
- Drain Hose: diameter and length
- Drain Pump: voltage and model number
- Float Switch: compatible with your dishwasher model
- Air Gap Cap: size and type
Consult your dishwasher's manual for specific part numbers and installation instructions.
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When to call a pro
- If the dishwasher still doesn't drain after clearing all blockages
- If the drain pump is damaged and needs replacement
- If you are unsure about electrical components or internal wiring
- If the problem persists after replacing parts
- If you notice water leaking outside the dishwasher
FAQ
How often should I clean the dishwasher filter?
Clean the filter every 1-2 months to prevent clogs and maintain performance.
Can a clogged air gap cause drainage issues?
Yes, a clogged air gap can restrict water flow and lead to drainage problems.
What should I do if the drain pump is not working?
Check for obstructions first. If the pump is faulty, it may need to be replaced by a professional.
Is it normal for the dishwasher to make gurgling sounds during draining?
Occasionally, gurgling sounds can be normal, but persistent noises may indicate a blockage or pump issue.