Quick Answer
Most dishwashers that won't drain have a blocked filter, a kinked or blocked drain hose, or a blocked air gap. Check those three first, because they take a few minutes and cost nothing. If the water still stays in the base, the drain pump or drain valve may need replacing, and that needs a licensed technician.
Switch the dishwasher off at the wall before you open it or reach inside the base.
You finish a cycle, open the door, and there is still water sitting in the bottom. A dishwasher that doesn't drain is one of the most common calls we take in Melbourne, and it is often caused by something small. DP Electric repairs dishwashers across Melbourne, and most drain faults are fixed in a single visit.
This guide covers the checks you can do yourself, the signs that point to a pump or valve fault, and when it's time to book a dishwasher repair in Melbourne.
Step 1: Clean the filter
The filter sits at the bottom of the dishwasher and catches food, seeds, and small pieces of glass. When it clogs, water has nowhere to go. Remove it (most twist or lift out), rinse it under warm water, and use a soft brush on the mesh. Put it back in securely.
Step 2: Check the drain hose
The drain hose runs from the dishwasher to the sink or waste pipe. Look for kinks behind the unit, and make sure the hose loops up under the bench before it drops to the drain. If your dishwasher connects to a garbage disposal, check that the disposal's knockout plug has been removed. A plug left in place blocks the drain completely.
Step 3: Check the air gap
Many installations have a small cap or cylinder on the kitchen sink or bench. This is the air gap, and it stops dirty water flowing back into the dishwasher. If it's blocked with food or grease, water can't drain. Remove the cap, clear it out, and check it again.
When the pump or drain valve is the problem
If the filter, hose and air gap are clear and the water still stays in the base, the fault is usually inside the unit. A drain pump that is failing may hum, make no sound at all, or run without moving water. A faulty drain valve or control board can also stop the drain cycle. These parts are not safe to test without the right tools and training, so this is the point to call a technician.
Why standing water is worth fixing quickly
Water left in the base can start to smell, grow mould around the door seal, and put strain on the pump every time you run the machine again. Running the dishwasher with standing water also makes the next cycle less effective, because the spray arms are working in dirty water.
Book a Dishwasher Repair in Melbourne
If the filter and hose checks don't fix it, book a dishwasher repair with DP Electric. You can find your suburb on our Melbourne locations page. For related faults, read our dishwasher error codes guide and common dishwasher fixes.
What's Safe to Check Yourself vs When to Call a Pro
Safe to Check Yourself
- Switch off at the wall before you touch the filter or inside the base.
- Remove the filter, rinse it, and check for food, seeds and glass.
- Check the drain hose for kinks and make sure the loop under the bench is in place.
- Remove and clear the air gap cap if your unit has one.
Always Call a Licensed Technician
- Test the drain pump for power and continuity.
- Check the drain valve and its wiring.
- Confirm the control board is sending the drain signal during the cycle.
Frequently Asked Questions
Why is there water left in my dishwasher after a cycle?▼
The most common causes are a blocked filter, a kinked drain hose, or a blocked air gap. If those are clear, the drain pump or drain valve may be failing.
Can I use drain cleaner in the dishwasher?▼
Avoid harsh chemical drain cleaners in the dishwasher. They can damage seals and plastic parts. A dishwasher-safe cleaning product is a better choice.
Is it safe to keep running the dishwasher with water in it?▼
We don't recommend it. Standing water can leak, cause odours and strain the pump. Clear the cause first, or switch the unit off and book a repair.
How long does a dishwasher drain repair take?▼
A blocked filter or hose is usually a few minutes. A pump or valve replacement often takes one visit if the part is on the van, and we confirm that when you book.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.