Dishwasher Repair in Nairobi | 0704843613

By Refitec | Appliance Repair & Maintenance Experts

There’s nothing more off-putting than opening your dishwasher and being hit by an unpleasant odour. If you’ve been asking yourself, “why does my dishwasher smell?”, you’re not alone. It’s one of the most common appliance complaints homeowners face — and the good news is, it’s almost always fixable.

In this guide, Refitec walks you through the most common causes of a smelly dishwasher, how to tackle each one, and what you can do to prevent the problem from coming back.

The Most Common Reasons Your Dishwasher Smells

1. Food Debris Trapped in the Filter

The number one culprit behind a smelly dishwasher is a dirty filter. Your dishwasher’s filter catches food particles to prevent them from recirculating onto your dishes — but if it isn’t cleaned regularly, those trapped particles decompose and create a foul, rotten smell.

What to do: Remove the filter (usually located at the bottom of the dishwasher tub), rinse it under warm running water, and use a soft brush with a little dish soap to remove stubborn grime. Aim to clean your filter at least once a month.

2. Standing Water at the Bottom

If water sits stagnant at the bottom of your dishwasher after a cycle, it will quickly turn musty and unpleasant. This is often caused by a blocked or slow-draining drain hose, a clogged pump, or a faulty drain valve.

What to do: Check for visible blockages near the drain area. If the problem persists, it could indicate a drainage issue that requires a professional repair — something the Refitec team can help diagnose and resolve quickly.

3. Mould and Mildew Growth

Dishwashers are warm, moist environments — perfect conditions for mould and mildew to thrive. You may notice black or grey spots along the door seal, corners of the tub, or around the spray arms. Mould produces a musty, damp odour that can linger even after a wash cycle.

What to do: Wipe down the door gasket and interior walls with a diluted white vinegar solution or a dedicated dishwasher cleaner. Leave the door slightly ajar between cycles to allow air circulation and reduce moisture build-up.

4. Dirty Spray Arms

The spray arms have small holes that jet water around the dishwasher during a cycle. Over time, these holes can become clogged with food particles, limescale, and grease — reducing cleaning performance and contributing to bad smells.

What to do: Remove the spray arms and soak them in warm, soapy water. Use a toothpick or small brush to clear out any blocked holes before reattaching them.

5. Limescale and Hard Water Deposits

If you live in a hard water area, mineral deposits can build up inside your dishwasher over time. This limescale coating creates a rough surface that traps food and bacteria, leading to persistent odours.

What to do: Run an empty cycle with a cup of white vinegar placed upright on the top rack. Alternatively, use a specialist dishwasher descaler once every couple of months. Using a dishwasher salt regularly also helps combat hard water build-up.

6. Blocked or Dirty Door Seal

The rubber gasket around the door is one of the most overlooked areas when it comes to dishwasher cleaning. Food residue, grease, and soap scum accumulate in the folds of the seal, and because it rarely gets exposed to the hot water inside the machine, it becomes a breeding ground for bacteria and mould.

What to do: Use a damp cloth or old toothbrush to clean along the entire length of the door seal, paying close attention to any folds or crevices. A mild bleach solution can help if mould has already taken hold.

7. Infrequent Use

If you only run your dishwasher every few days, water and food residue sitting in the filter and drain can start to smell between cycles. The lack of regular flushing allows bacteria to multiply.

What to do: Try to run your dishwasher at least every two days if possible, or do a quick rinse cycle to keep things fresh. If you’re going away for an extended period, clean the filter and leave the door ajar before you go.

How to Deep Clean a Smelly Dishwasher

If your dishwasher already has an established odour, a full deep clean is the best starting point. Here’s Refitec’s recommended approach:

Remove and clean the filter — scrub away all trapped debris.
Wipe down the door seal — get into every fold and crevice.
Clear the drain area — remove any visible food or blockages.
Clean the spray arms — unblock all the jet holes.
Run a hot vinegar cycle — place a dishwasher-safe bowl filled with white vinegar on the bottom rack and run the hottest cycle available.
Follow with a baking soda cycle — sprinkle a cup of baking soda across the bottom and run a short hot cycle to neutralise any remaining odours.

When to Call a Professional

If you’ve cleaned your dishwasher thoroughly and the smell persists, or if you suspect the issue is related to drainage, the pump, or internal components, it’s time to call in the experts. A persistent smell combined with poor cleaning results, standing water, or unusual noises can indicate a mechanical fault that needs professional attention.

At Refitec, our experienced engineers specialise in diagnosing and repairing all makes and models of dishwasher. We offer fast, reliable callouts and use genuine parts to get your appliance back to its best.

Tips to Prevent Your Dishwasher from Smelling

Scrape plates before loading — you don’t need to pre-wash, but remove large food scraps.
Clean the filter monthly — make it part of your regular kitchen routine.
Leave the door ajar after cycles to let moisture escape.
Use quality dishwasher tablets and always use salt and rinse aid.
Run a maintenance wash with a dishwasher cleaner every 1–2 months.
Don’t let dirty dishes sit for days before running the machine.

Final Thoughts

A smelly dishwasher is almost always down to a build-up of food, grease, mould, or limescale — all of which are preventable with regular care and attention. By establishing a simple cleaning routine, you can keep your dishwasher running efficiently and smelling fresh all year round.

If you’re dealing with a more serious issue or need expert help, Refitec is here for you. Contact us today to book a dishwasher repair or service visit.

Article written by the Refitec appliance repair team — helping homeowners get the most from their home appliances.