Standing water in your dishwasher is frustrating and can lead to odours and poor cleaning performance. Drainage problems usually come from clogs, pump issues, or installation faults.
Common causes of dishwasher drainage problems
- Clogged filter: Food debris can block proper drainage.
- Blocked drain hose: A kink or clog can stop water from exiting.
- Garbage disposal connection: A blocked disposal inlet can cause backup.
- Faulty drain pump: If the pump fails, the dishwasher won’t drain.
- Control board or sensor issue: Some models prevent draining if sensors detect an error.
Quick checks you can do
- Clean the dishwasher filter and remove debris.
- Check the drain hose for bends or pinches.
- Run a short cycle and listen for the drain pump during draining.
- If connected to a garbage disposal, ensure the inlet is clear.
When it’s time for a professional
If the unit leaks, makes unusual noises, repeatedly shows error codes, or still won’t drain after basic checks, a technician can test the pump, valves, and control system safely.