How to Fix a Smelly Dishwasher
Last updated: 4 September 2026
Quick Answer
Run a hot empty cycle with vinegar, clean the filter, and check the drain hose.
Overview
A smelly dishwasher can make your dishes smell bad. This guide covers cleaning and deodorising the dishwasher.
Step-by-Step Fix
Safety & Preparation
Before beginning any repair, ensure you have isolated power or water supplies. Clear your workspace, gather standard hand tools, and wear appropriate personal protective equipment (PPE).
- To begin, load an empty dishwasher, then pour approximately 250ml of white vinegar into a dishwasher-safe bowl on the top rack or directly onto the bottom of the machine. Select the hottest possible wash cycle and run it to thoroughly sanitise the interior and neutralise odours. Once the cycle finishes, open the door and check if the smell has dissipated.
- Locate and carefully remove the dishwasher's filter, which is usually found at the bottom of the machine; some models may require a twist or click to unlock it. Under warm running water, scrub the filter thoroughly with a stiff brush and washing-up liquid to dislodge any trapped food particles, grease, or debris. Before reinserting, visually confirm the filter is completely free of gunk and rinse it clean.
- First, pull the dishwasher slightly away from the wall to access the rear connections, ensuring the appliance is unplugged from the mains electricity for safety before proceeding. Inspect the drain hose for any visible kinks, bends, or blockages, and carefully straighten any twists. If accessible, gently disconnect the hose and check for internal obstructions by looking through it or flushing with water, then reattach securely.
- Open the dishwasher door fully and meticulously inspect the rubber door seal, paying close attention to the grooves and folds where grime often accumulates. Dampen a clean cloth with warm soapy water and wipe down the entire seal, removing any food residue, mould, or mildew. Ensure the seal is completely clean and dry before closing the door, as residual moisture can encourage further growth.
- To maintain a fresh-smelling dishwasher, incorporate a monthly cleaning routine using a dedicated dishwasher cleaner. Follow the product's instructions carefully, typically by placing the cleaner in an empty machine and running a hot wash cycle. After the cycle, verify that the interior feels clean and smells fresh, indicating a successful deep clean.
Common Symptoms & Diagnostic Resolutions
Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.
| Symptom / Code | Likely Root Cause | Recommended Resolution |
|---|---|---|
| Bad smell | Bacteria and food residue | Clean the filter and run a cleaning cycle. |
| Smell from dishes | Machine needs cleaning | Use a dishwasher cleaner. |
Frequently Asked Questions
Why does my dishwasher smell?
Food debris, bacteria, or a dirty filter.
How often should I clean my dishwasher?
Monthly to prevent odours.