Your dishwasher is likely not draining due to a blockage in the filter, a kinked drain hose, or a clogged kitchen sink connection. To fix this, check the filter at the bottom of the tub for food debris and ensure the waste hose under your sink is clear and not pinched.
Standing water at the bottom of your dishwasher is a common headache for households across Melbourne, from busy apartments in St Kilda to family homes in Brighton. When your cycle ends but the water remains, it is usually a sign that the drainage system is obstructed.
At Appliance Repairs Online, our technicians have 15+ years of combined appliance repair experience and regularly diagnose dishwasher drainage issues. Often, the solution is a simple DIY fix, but in some cases, the problem may involve a failing drain pump or faulty component that requires professional attention. When servicing Melbourne households, we frequently encounter drainage problems caused by mineral build-up, food debris or other blockages that can affect the dishwasher’s drainage system.
Common Culprits: Why Water Stays in the Tub
Before you call a technician, it is helpful to understand what usually goes wrong. We have categorised some of the most common causes based on our technicians’ practical experience diagnosing and repairing dishwasher faults.
| Cause | Difficulty to Fix | Likely Solution |
| Clogged Filter | Easy | Manual cleaning of the mesh filter. |
| Kinked Drain Hose | Easy | Straighten the hose under the sink. |
| Blocked Air Gap/Sink Spigot | Medium | Clear the connection point to the sink plumbing. |
| Faulty Drain Pump | Hard | Component replacement required. |
| Control Board Error | Hard | Professional diagnostic and reset. |
Step-by-Step Troubleshooting for Melbourne Homeowners
- Clear the Dishwasher Filter
The filter is your first line of defence. Over time, it traps food particles, broken glass, and grease. In many older Melbourne rentals, these filters haven’t been cleaned in months.
- Remove the bottom rack.
- Twist the cylindrical filter counter-clockwise and lift it out.
- Rinse it under hot soapy water at your kitchen sink.
- Inspect the Drain Hose
The hose connects your dishwasher to the plumbing under your sink. If you recently moved items around in your “under-sink” cupboard, you might have accidentally kinked the line. Ensure the hose has a “high loop” to prevent dirty sink water from flowing back into your dishwasher.
- Check the Sink Connection
Since dishwashers usually drain into the same pipe as your kitchen sink, a clog in your sink can prevent the dishwasher from emptying. If your sink is draining slowly, use a plunger or clear the P-trap. For residents near the coast in St Kilda, we often see sand or grit from beach gear end up in the plumbing, which can contribute to these blockages.
When to Call a Professional
While DIY fixes are great, certain mechanical failures are best left to the experts. If you have cleared the filters and the hose is straight, the issue might be the Drain Pump.
In our technicians’ experience, some high-end European dishwasher brands found in Melbourne homes may require specific tools to access the pump housing. If the pump is humming but not moving water, or if it is making a loud grinding noise, it may indicate a pump fault that requires inspection and potentially replacement.
Pro Tip: Regular maintenance is key. Once a month, run an empty cycle with a dedicated dishwasher cleaner or a cup of white vinegar to dissolve Melbourne’s mineral deposits and keep the internal seals flexible.
