Dishwasher Not Cleaning Properly - What to Check in Ashford

Published September 2026 | Dishwasher Not Cleaning Properly What to Check

How Long Should a Dishwasher Last and What Affects That

Most dishwashers are built with a lifespan of around 10 to 12 years in mind. Whether yours reaches that point depends on a few key factors: water hardness, how often you run it, and how well it has been looked after. In Kent, where water is moderately to very hard across much of the county, limescale is one of the biggest hidden enemies of appliance longevity - and it builds up silently over years of daily use.

Ashford sits in an area with hard water. That means every wash cycle deposits a small amount of calcium and magnesium onto your machine's internal components - the spray arms, the filter, the heating element, and the pump. Over time, those deposits accumulate and start affecting performance. You will notice it first in your wash results before you notice any mechanical failure. Dishes come out cloudy, gritty, or with food still stuck on. That is usually the first real signal that something needs attention.

Brand choice matters more than most people realise. Bosch and Siemens machines typically hold up well past the 10-year mark with basic maintenance. Hotpoint and Beko appliances are more affordable upfront but tend to show wear earlier, commonly around the 7 to 9 year point. LG and Samsung models sit somewhere in the middle - well built, but with more complex electronics that can become expensive to repair as they age. A cheaper machine that gets properly maintained will often outlast a premium one that gets neglected.

How frequently you run it matters less than you might expect. Using a dishwasher daily is not inherently hard on it. What causes real damage over time is running it with the wrong detergent dose, ignoring the filter for months, or relying exclusively on short cycles that do not flush the system properly.

The Maintenance That Actually Makes a Difference

When a dishwasher is not cleaning properly, the first thing our engineers check is the filter. It sounds basic, but a clogged or partially blocked filter is behind the majority of poor wash results we see in Ashford homes. Most households clean it far less often than they should - some never do at all.

Here is what actually makes a practical difference:

1. Clean the filter monthly. Remove it, rinse it under the tap, and use a soft brush to clear any trapped food debris. On most machines this takes about two minutes. On Bosch and Neff models, the filter system is two-part - make sure you clean both components, including the coarse mesh and the fine cylindrical filter underneath it.
2. Clear the spray arm holes every three months. The small holes in the spray arms block with food particles and limescale deposits. Remove the arms and use a toothpick or fine wire to clear each hole individually, then rinse thoroughly. If a hole is blocked, that entire zone of your dishwasher will not get properly cleaned - you will see it in specific areas of the rack where dishes consistently come out dirty.
3. Run a dishwasher cleaner every one to two months. Products like Finish Dishwasher Cleaner or Dettol Washing Machine and Dishwasher Cleaner dissolve grease and limescale from internal components you cannot physically reach. Run it on the hottest programme with an empty machine.
4. Keep the door seal clean. The rubber gasket around the door traps food debris and moisture, which leads to mould growth and can compromise the seal's integrity over time. Wipe it down weekly with a damp cloth, paying attention to the bottom edge where pooling is worst.
5. Use the right amount of salt and rinse aid. In hard water areas, your machine needs dishwasher salt in the softener reservoir. If the salt indicator light is showing, refill it promptly. Without softened water, limescale will coat the heating element and significantly reduce its efficiency and lifespan.
6. Set the water softener to the correct level. Most machines let you programme the softener to match your local water hardness. Check your manual for the correct setting for the Ashford supply area and adjust it if you have never done so.

When our engineers run the Voltrade GoFIX diagnostic check on a machine with poor cleaning performance, blocked spray arms and a limescale-coated heating element consistently come up as the root causes. Both are entirely preventable with routine maintenance that takes a few minutes each month.

Warning Signs It Is Reaching End of Life

There is a clear difference between a dishwasher that needs a service and one that is on its last legs. Knowing which is which can save you a significant amount of money - either by avoiding an unnecessary replacement, or by not pouring repair costs into a machine that will fail again within months.

Watch out for these signs:

• Water not draining after a cycle. Standing water at the bottom can indicate a blocked filter or a blocked pump - both fixable. But if the pump motor itself is failing on a machine that is 10 or more years old, repair costs can approach the price of a new budget appliance.
• The door latch is failing or inconsistent. A door that will not close and lock reliably on an older machine is sometimes a sign that the door seal and hinges have also deteriorated. Each component might be repairable in isolation, but if multiple parts are going at once, that changes the calculation.
• Unusual mechanical noise during cycles. A grinding or persistent humming noise suggests the pump bearings are wearing. A rattling noise might just be a loose spray arm - quick and cheap to fix. But consistent mechanical noise from inside a machine over 10 years old warrants a proper inspection before you invest in a repair.
• Dishes come out cold or barely dried. If the heating element has failed, food residue will not be properly sanitised and drying performance will drop sharply. Replacing a heating element typically costs between 80 and 150 pounds for parts and labour, which is reasonable on a younger machine but harder to justify on one that is already ageing.
• Rust visible inside the drum. Surface rust on dishwasher racks is common and the racks can be replaced inexpensively. But rust on the drum itself means the stainless steel interior has been compromised - usually from prolonged contact with standing water. At that point, the machine is past its useful life.
• Repeated unexplained error codes. The occasional fault code is not necessarily serious. But a machine that throws up errors repeatedly, resets, and does it again a few cycles later is telling you that something is failing internally - often the control board or a sensor.

Repair vs Replace - The Honest Calculation

The rule of thumb our engineers use is the 50 percent rule: if a repair will cost more than 50 percent of what a comparable new machine costs, replacing is usually the better financial decision - especially for machines over 8 years old. A newer machine also comes with a manufacturer warranty, which has real value.

In practice, here is how the numbers break down for the most common repairs:

• Filter, spray arm, or door seal replacement: typically 30 to 80 pounds for parts and labour. Worth doing at almost any age.
• Pump replacement: typically 120 to 200 pounds. Worth doing on a machine under 7 years old; more marginal on older appliances.
• Control board failure: typically 150 to 280 pounds. Generally only worth it if the machine is under 5 years old or is a premium brand like Bosch or Miele.
• Heating element replacement: typically 80 to 150 pounds. Worth doing unless the machine has multiple other issues developing simultaneously.

A new mid-range dishwasher will typically cost between 350 and 600 pounds fitted. A budget model from Hotpoint or Beko can be had for 250 to 350 pounds supplied and installed. A premium Bosch or Siemens will cost 600 to 900 pounds or more depending on the model.

Factor in energy efficiency when you are doing this calculation. A newer A-rated machine will typically use less water and electricity per cycle than a 10-year-old appliance. Over several years of daily use, that difference adds up on household bills - and it is worth weighting that against the cost of repair on an older, less efficient machine.

Annual Service - What It Should Include

Most people do not think about servicing a dishwasher until something goes wrong. That is understandable - it is not like a boiler where annual servicing is tied to safety requirements. But a yearly check-over on a machine you run every day makes practical sense, particularly in hard water areas of Kent where limescale builds faster than most homeowners expect.

A proper annual dishwasher service should cover all of the following:

1. Full inspection and clean of the filter assembly, including the coarse and fine filter stages
2. Spray arm removal, descaling, and clearing of all water outlet holes
3. Door seal inspection for cracking, mould, or deformation
4. Water inlet valve check and flow rate verification
5. Pump and motor inspection for signs of wear, leakage, or bearing noise
6. Heating element test - confirming it reaches the correct operating temperature
7. Water softener level and salt reservoir inspection
8. Door latch and hinge condition check
9. Full test cycle with assessment of wash results, water temperature, and drying performance

A dishwasher service in the Ashford area typically costs between 60 and 100 pounds. That might seem like an avoidable expense on a machine that appears to be working, but it catches developing problems before they become expensive repairs - and it consistently extends the machine's working life by several years when done regularly.

Simple Habits That Extend the Life by Years

Beyond formal maintenance, the daily habits around how you use your dishwasher make a substantial difference to how long it keeps performing well. None of these require extra equipment or much time - they are just practices that are easy to overlook.

Scrape, do not rinse. Modern dishwashers are designed to handle food residue - the detergent actually performs better when there is something for it to work on. Pre-rinsing plates wastes water and is not necessary. Large food chunks should be scraped off before loading, or they will end up in the filter and restrict flow.

Do not overload. Packing too many items in blocks the spray arms from rotating and prevents water from reaching all surfaces. Dishes come out dirty, and the machine works harder than it should. Use the racks as designed - dinner plates in the lower rack standing upright, glasses and lighter items in the upper rack with space between them.

Run a hot programme regularly. If you predominantly use eco or quick cycles, grease accumulates in the internal pipework over time. Running a full 65 or 70 degree cycle at least once a week keeps the system flushed and prevents grease buildup from affecting the pump and filter.

Leave the door ajar after a cycle completes. Opening the door slightly once a wash finishes lets moisture escape. Keeping the door closed while the interior is warm and damp creates ideal conditions for mould on the door seal and around the drum edges.

Keep rinse aid topped up. Rinse aid is not just for drying performance - it prevents water spotting and residue from forming on the interior surfaces of the machine itself. Keep it filled, particularly given the hard water conditions across this part of Kent.

Do not ignore error codes. If your machine shows a fault code and you keep resetting it without investigating, you are likely allowing a small problem to develop into a larger one. On Bosch and Samsung machines, error codes are specific and informative - look them up or call an engineer promptly rather than running cycles and hoping they clear.

Maintenance Questions

Why are my dishes still dirty after a full cycle?

The most common causes are a blocked filter, clogged spray arm holes, or insufficient detergent and salt. Start with the filter - remove it, rinse it clean under the tap, and run another cycle. If that does not resolve it, remove the spray arms and clear each hole with a toothpick. If the problem continues after both of those steps, it is worth having an engineer check the water temperature and pump pressure, as a failing heating element or a worn pump can both produce the same symptom of persistently dirty dishes.

How often should I clean my dishwasher filter in Ashford?

In Ashford, where the local water supply is hard and accelerates limescale build-up, cleaning the filter once a month is the right frequency for a machine in daily use. If you have a large household or cook from scratch most evenings, every two to three weeks is better. It takes around two minutes and is the single most effective routine maintenance task you can do to maintain wash quality between professional services.

Is it worth repairing a dishwasher that is more than 10 years old?

It depends on what needs doing. Simple fixes - a new door seal, a pump clean-out, or a replacement spray arm - are worth doing even on older machines because the parts are cheap and labour is minimal. But if you are looking at a pump motor replacement or a control board repair on a machine over 10 years old, the cost typically approaches what you would pay for a new budget machine from Hotpoint or Beko - and a new machine comes with a warranty and better energy efficiency.

What should I use to descale a dishwasher in a hard water area?

A dedicated dishwasher descaler run every one to two months will help keep limescale under control in hard water areas. Products like Finish Power and Clean or supermarket own-brand equivalents work well - run them on a hot cycle with an empty machine. Keeping the salt reservoir topped up is equally important, since the built-in water softener reduces limescale formation on the heating element and spray arms during every single wash cycle you run.