Dishwasher Not Cleaning Properly What to Check Norwich Homeowners Need to Know

Published August 2026 | Dishwasher Not Cleaning Properly What to Check

A homeowner in Norwich comes home after a long day, unloads the dishwasher and pulls out a plate still wearing last night's pasta sauce. The glasses have that familiar cloudy film across them, and the cutlery basket is full of forks that look like they went in dirty and came back out the same way. She runs the machine again on a longer programme, same result. The dishwasher is only three years old - a Bosch she bought from a local appliance shop on Riverside Road - and there's no obvious error code, no leaking, nothing dramatic. It just isn't cleaning properly.

This is one of the most common calls we get from across Norwich and the wider Norfolk area. The dishwasher runs, it uses water and electricity, it makes all the right noises - but the results are consistently poor. Most people assume the machine is breaking down and brace themselves for a replacement. In the majority of cases, that assumption is wrong.

What Was Actually Going On

When our engineer ran the Voltrade GoFIX diagnostic on the machine, it quickly pointed toward a few likely culprits before he even opened the door. The homeowner had been loading the machine the same way for years, running it on eco mode almost exclusively, and had never cleaned the filter. That last point is critical.

Opening the machine and pulling the filter out told the story immediately. It was clogged with a thick paste of food debris, grease and limescale. Water was passing through the system, but the circulation pump was working against a significant restriction. That meant the spray arms weren't getting anything close to the pressure they needed to actually shift food from dishes.

The spray arms themselves were the second problem. The small holes that jets water onto your crockery - typically around twelve to fifteen of them on the lower arm and six to eight on the upper - had partially blocked with limescale. Norfolk has moderately hard water, and in Norwich specifically the water hardness sits in a range that, over time, deposits calcium carbonate inside anything it passes through. The upper spray arm had three holes completely blocked and several more running at reduced flow.

The third issue was detergent-related. She was using a budget own-brand tablet, which is fine on its own, but she was also skipping rinse aid entirely because she thought the all-in-one tablets made it unnecessary. In hard water areas, rinse aid isn't optional - it genuinely changes how water sheets off dishes during the final rinse cycle. Without it, water clings, leaves mineral deposits and produces that dull, etched-looking finish on glassware.

Finally, the eco mode setting. Eco programmes are designed to save energy by using lower temperatures and longer run times. They work well when dishes go in relatively clean and the machine itself is in good condition. When there's any restriction in the system - a dirty filter, partially blocked spray arms, reduced water pressure - eco mode doesn't have the temperature or the mechanical force to compensate. Hot programmes at 65 degrees cut through grease and activate detergents more effectively. Running eco exclusively on a machine with underlying issues compounds everything.

How the Problem Was Resolved

The fix took about an hour and a half and involved no replacement parts whatsoever. Here's exactly what was done, in order.

1. Filter removal and cleaning. The filter assembly on this Bosch model unscrews with a quarter turn at the base of the machine. It came out as a single unit - a coarse mesh basket around a finer cylindrical filter - and went straight into a sink of hot soapy water. A soft brush cleared the mesh and a soak for fifteen minutes loosened the compacted grease. Both parts were rinsed thoroughly and checked against the light to confirm nothing remained blocking the mesh.
2. Spray arm removal and clearing. Both spray arms unclip without tools on most modern machines, including Bosch, Hotpoint and Beko models. Each arm was taken to the sink. A cocktail stick and a fine brush worked through each jet hole, and a flush under running water confirmed clear flow through every one. If you hold a spray arm up to a light and look down the holes, you can see immediately which ones are blocked - they'll be dark rather than showing a clear circle of light.
3. Limescale treatment. A proprietary dishwasher cleaner was run on the hottest cycle available - in this case a 70-degree intensive programme. These cleaners are acidic enough to dissolve limescale deposits throughout the internal pipework and the wash sump. Finish Machine Cleaner and Durgol are both reliable options. The engineer recommended doing this monthly given the water hardness in this part of Norfolk.
4. Salt and rinse aid topped up. The softener salt reservoir was empty. On machines that have a built-in water softener - which most European dishwashers do - the salt is separate from the detergent and needs to be topped up independently, even when using all-in-one tablets. The rinse aid dispenser was filled and the setting adjusted to level four, which is appropriate for the water hardness in the Norwich area.
5. Loading reviewed. The engineer pointed out that the way dishes were being loaded was blocking the upper spray arm's rotation. Large pots on the bottom rack were overlapping into the space where the arm sweeps, meaning half the upper rack was getting almost no water. A few minutes repositioning plates and bowls - nothing going below the level of the rack tines, nothing overlapping the central column - made a visible difference to coverage.

The machine was then run on a full 65-degree cycle with a quality tablet (Finish Quantum in this case) and rinse aid in the dispenser. The results were completely different. Glasses came out clear, plates spotless, the cutlery basket contents looked like new.

What This Cost and How Long It Took

The call-out and labour for this job came to around 60 to 80 pounds including the diagnostic. The parts cost were essentially zero - no components were replaced. The homeowner spent around 15 pounds on a bottle of dishwasher cleaner, a bag of dishwasher salt and a bottle of rinse aid. Total outlay for restoring a machine she'd been ready to replace: under 100 pounds.

For context, if a spray arm does need replacing, the part typically costs between 8 and 25 pounds depending on the brand and model. A new circulation pump - which is what drives water through those arms - typically costs between 40 and 90 pounds for the part, plus labour. Those jobs are worth doing on a machine under five or six years old. On an older machine, or one where multiple components are failing simultaneously, replacement may make more financial sense. But for most cases like this Norwich homeowner's, it's maintenance rather than mechanics that's the problem.

The whole visit, from knocking on the door to the engineer leaving with the machine running its test cycle, was about ninety minutes. Most of that time was the diagnostic check and the cleaning work, not waiting for parts or complex disassembly.

How to Spot the Same Issue in Your Home

If you're seeing poor cleaning results from your dishwasher, work through this checklist before you do anything else.

Check the filter first. Pull it out - it's at the bottom of the machine, usually a twist-out design. If it looks dark, greasy or has visible food debris, that's your starting point. A filter should be cleaned every two to four weeks under normal use. Most people clean it never.

Inspect the spray arms. Remove both arms and hold them up to the light. Every hole should show clearly. Blocked jets mean blocked coverage. Run water through them and watch that it flows freely from all holes. On LG and Samsung machines, the spray arm attachment mechanism varies slightly, but most still unclip without tools.

Check salt and rinse aid levels. There are indicator lights on most machines, but they only trigger when levels are critically low. If you can't remember the last time you topped either up, assume they need doing. In Norfolk's moderately hard water conditions, salt makes a meaningful difference to wash performance and protects the machine's internal components over time.

Look at how you're loading. The single most common self-inflicted cause of poor cleaning is overloading or blocking spray arm rotation. Nothing should sit lower than the bottom of a rack tine. Nothing should extend into the space the upper arm sweeps through. Bowls face down. Glasses go between tines, not over them.

Think about your programme choice. Eco mode is not suitable as your only wash setting, especially on a machine that needs a bit of a clean itself. Run a 65-degree or intensive cycle once a week as your baseline, and use eco mode for lightly soiled loads.

Look for limescale on the interior door seal and walls. A white, chalky deposit on surfaces inside the machine tells you limescale is building up throughout the system. A monthly machine cleaner cycle will keep this in check.

Lessons Every Norwich Homeowner Should Know

The thing that strikes our engineers most often when attending this type of call-out across Norwich is not the severity of the problem - it's how long the homeowner has been putting up with it. Months of poor results, running extra cycles, hand-washing things that came out dirty. All of that time and cost, when a filter clean and a bottle of dishwasher salt would have fixed it.

Dishwashers are not self-maintaining appliances. They need routine attention, just less of it than people expect. A fifteen-minute clean every month - filter out, rinse it, wipe the door seal, top up salt and rinse aid - will prevent the vast majority of performance issues. The machine will also last longer. Internal components like the wash pump and the element work harder when fighting through a restricted, scaled-up system.

Water hardness is a real factor in this part of the country. Norwich sits in a zone where the water is hard enough that limescale will build up in any appliance that uses water if it's not managed. Kettles, showerheads, washing machines and dishwashers are all affected. For dishwashers specifically, the built-in softener system - fed by the salt reservoir - is your primary defence. Use it.

Brand matters less than maintenance. A well-maintained budget Beko will outperform a neglected Bosch. That said, Bosch and Miele tend to have more accessible filter and spray arm designs that make routine cleaning easier, which is part of why they consistently score well in long-term reliability assessments. Hotpoint and Indesit machines are common in Norwich households and perform well when properly maintained, though their filters can be slightly fiddlier to remove on older models.

If you've gone through the checklist above and the machine is still not cleaning properly, the next likely causes are a failing wash pump, a faulty heating element (which means water isn't reaching the right temperature), or a fault in the control board. At that point, a proper diagnostic visit is worthwhile. The Voltrade GoFIX tool can flag likely causes before the engineer arrives, which means faster diagnosis and less time spent working through possibilities on your kitchen floor.

One thing worth knowing: if a repair is going to cost more than half the replacement value of the machine, most engineers will tell you honestly. You don't need to feel pressured into a repair that doesn't make financial sense. A good appliance repair engineer in Norwich will give you a straight answer about what the job is worth relative to the age and condition of the machine.

Related Questions

Why are my glasses coming out cloudy even after a full wash cycle?

Cloudy glasses are typically caused by one of two things - limescale deposits from hard water, or etching, which is permanent damage from overly harsh detergent or excessive heat. If the cloudiness wipes off easily with a damp cloth, it's limescale and can be treated with rinse aid and regular machine cleaner cycles. If it doesn't wipe off and the glass feels slightly rough, that's etching, which is irreversible. Reducing detergent quantity and temperature for delicate glassware will prevent further damage.

How often should I clean my dishwasher filter?

Every two to four weeks is the standard recommendation, though if you run the machine daily or regularly wash heavily soiled pots and pans you may need to clean it more often. Pull it out, rinse it under hot running water and use a soft brush to clear any trapped debris. It takes less than five minutes and makes a significant difference to cleaning performance. Most people in Norwich who call us about poor results haven't cleaned the filter in months.

Can I use washing-up liquid instead of dishwasher tablets in an emergency?

No - and it's worth being clear about why. Washing-up liquid creates a large volume of foam when agitated by the wash pump, which can overflow the machine and cause a significant mess on your kitchen floor. It's also not formulated to work in the high-temperature, high-pressure environment inside a dishwasher. A single tablet of standard dishwasher detergent - even a cheap one - is always preferable. If you've run out, it's better to hand-wash than risk a sudsy overflow.

Is it worth repairing a dishwasher that's more than seven years old?

It depends on what's wrong. Maintenance issues - blocked filters, scaled spray arms, empty salt reservoirs - are always worth sorting regardless of age. A minor mechanical fault like a door latch or a worn spray arm costs little and extends the machine's life meaningfully. For major components like a wash pump or control board on a machine over seven or eight years old, the calculation gets tighter. If the repair quote exceeds around 150 pounds on an older machine, get a realistic assessment of remaining lifespan before committing. A reputable appliance engineer in Norwich will give you an honest view.