How to Fix a Dishwasher Not Cleaning Properly

Overview

A dishwasher that leaves food debris on dishes is frustrating. This guide covers diagnosing and fixing cleaning issues.

Step-by-Step Fix

1. Firstly, locate the filter assembly at the very bottom of your dishwasher, usually beneath the lower spray arm. Carefully twist and lift out all parts of the filter, then rinse them thoroughly under a tap to remove any trapped food debris, grease, or limescale. Before reassembling, check that all mesh and cup sections are completely clear and then securely refit the filter.
2. Next, meticulously examine the holes along both the upper and lower spray arms for any blockages from food particles or mineral deposits. If you find any, use a small, pointed tool like a toothpick, safety pin, or straightened paperclip to carefully poke through and clear each blocked jet. Ensure all holes are free and clear for optimal water spray before proceeding.
3. Check your dishwasher's water temperature by running a cycle and carefully observing if the water inside feels adequately hot, ideally around 50-65°C. If the water doesn't seem hot enough, this could indicate an issue with your hot water supply or the dishwasher's heating element, which might require professional assistance or checking your water heater settings.
4. To address hidden grease and limescale build-up, purchase a dedicated dishwasher cleaner, often found as a liquid or tablet. Follow the product instructions carefully, usually running an empty, hot wash cycle with the cleaner inserted, to thoroughly sanitise the interior and pipes. This process helps dissolve stubborn residues that impede cleaning performance.
5. Finally, ensure you are using the appropriate amount and type of dishwasher detergent for your specific water hardness, which you can often check online or with a test kit. Over-dosing or under-dosing can both lead to poor cleaning; adjust the quantity as recommended by your detergent manufacturer for your local water conditions to achieve sparkling results.

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.

Frequently Asked Questions