Dishwasher Not Cleaning Properly What to Check in Barnstaple

Published October 2026 | Dishwasher Not Cleaning Properly

You loaded the dishwasher last night, set it going before bed, and this morning the plates are still wearing last night's bolognese. The glasses are smeared, the cutlery is greasy, and you're wondering whether you'd have been better off washing up by hand. This is one of the most common calls our engineers receive from homeowners across Barnstaple and the surrounding parts of Devon - and the good news is that the cause is usually something you can at least check yourself before spending money on a repair.

What Is Actually Going Wrong Inside Your Dishwasher

When a dishwasher stops cleaning properly, something is interfering with one of three things: water getting in at the right pressure and temperature, detergent dissolving and reaching the dishes, or dirty water draining away completely after the cycle. Most faults trace back to one of these three systems. Understanding which one is affected is the first step to figuring out whether you're dealing with a five-minute maintenance job or something that needs a qualified engineer.

It's worth noting that poor cleaning performance often develops gradually rather than suddenly. You might notice dishes coming out slightly greasy one week, then worse the next. That slow decline is a strong signal that the machine needs attention rather than replacement. A dishwasher that cleans badly isn't necessarily a broken dishwasher.

The Most Common Causes of a Dishwasher Not Cleaning Properly

A Blocked or Dirty Filter

The filter is the single most common culprit our engineers find when visiting homes in Barnstaple with dirty dish complaints. It sits at the bottom of the dishwasher tub - usually a cylindrical mesh basket you can untwist and lift out - and its job is to trap food debris so it doesn't recirculate onto your crockery. If it hasn't been cleaned in a few months, it blocks up, water circulation drops, and dirty water starts washing back over everything you were trying to clean.

A clogged filter can cause your dishwasher to run poorly, and cleaning it takes about five minutes. Remove the filter, rinse it under warm running water, scrub it gently with an old toothbrush and a drop of washing-up liquid, and put it back. Do this monthly and you'll eliminate the most common source of poor cleaning at no cost at all.

Clogged or Jammed Spray Arms

The spray arms are the spinning plastic components that jet water up and around the inside of the machine during a wash. They have small holes punched into them, and over time those holes get blocked with limescale, food particles, or broken-down detergent. When that happens, the water jet loses pressure and coverage - so dishes on certain racks end up barely getting wet.

To check them, pull the spray arms off (most unclip or unscrew anti-clockwise), hold them up to the light, and look through each hole. If they're partially blocked, use a cocktail stick or a thin piece of wire to clear them, then rinse the arms thoroughly before clipping them back on. On Bosch and Beko machines, the lower spray arm tends to block first because it sits closest to the filter runoff.

Wrong or Low-Quality Detergent

Using a cheap own-brand tablet in a water-hungry Hotpoint or LG machine, or switching to pods when your dispenser is designed for powder, can make a noticeable difference to cleaning performance. Equally, if the detergent dispenser door is sticking shut mid-cycle because of build-up around the hinge, your dishes are essentially washing in plain hot water.

Check the dispenser door opens freely and that the compartment is dry before each wash. If there's a crusty residue around the door, wipe it clean with a damp cloth. For hard water areas - and many parts of Devon do have moderately hard water - using a rinse aid alongside your tablets makes a significant difference, particularly on glassware. If the rinse aid reservoir is empty, most machines will flag it with an indicator light.

Incorrect Loading

The way items are positioned directly affects what gets cleaned. Plates blocking the spray arm path, bowls stacked face-up and collecting dirty water, tall items in the lower rack stopping the upper spray arm from spinning - these are common mistakes that result in half-cleaned loads even when the machine itself is working perfectly.

As a general rule: place plates and large items in the lower rack facing the centre, bowls and smaller items on the upper rack facing downwards, and cutlery handles-down in the basket (except knives, which should go handles-up for safety). Before closing the door, give the spray arms a spin by hand to make sure nothing is blocking them from rotating freely.

Water Not Reaching the Right Temperature

Dishwashers are designed to clean at temperatures typically between 50 and 65 degrees Celsius. If the heating element is starting to fail or the thermostat is drifting, the water may not be getting hot enough to dissolve detergent or cut through grease. You might notice this alongside poor cleaning - dishes that come out slightly damp, or detergent tablets that haven't fully dissolved even at the end of a cycle.

This one is harder to diagnose without equipment. On Samsung and LG models with digital displays, an error code may appear on the control panel - note it down before calling an engineer, as it significantly speeds up diagnosis, particularly when we run a check using the Voltrade GoFIX diagnostic tool during the visit.

Limescale Buildup Inside the Machine

Devon's water hardness varies by area, but limescale build-up inside the machine - on the heating element, spray arms, and tub walls - can progressively degrade cleaning performance over time. You might see white chalky deposits on the inside of the door or on dark-coloured dishes and items. Running a dishwasher cleaner tablet through on a hot cycle every one to two months, without any dishes in the machine, helps keep limescale under control and protects the heating element over the long term.

Solutions That Actually Work

Here is a practical sequence to work through before you consider calling anyone. Do these in order, and you'll cover the most common causes efficiently.

1. Clean the filter. Remove it, scrub it with a toothbrush and washing-up liquid, rinse thoroughly, and refit it securely.
2. Clear the spray arms. Remove them, check each hole is clear using a cocktail stick, flush them under the tap, and clip them back on.
3. Check the detergent dispenser. Make sure the door opens properly and there's no built-up residue blocking the hinge or the compartment.
4. Run a hot maintenance wash. Put a dishwasher cleaner tablet in the bottom of an empty machine and run it on the hottest cycle available. This shifts grease, limescale, and old detergent from the internals in one go.
5. Refill the rinse aid. Check the reservoir and top it up if it's low. This is especially important for achieving clean, streak-free glassware.
6. Reload your dishes differently. Try spacing items out more and double-checking that nothing is blocking the spray arms before you close the door.

Common dishwasher problems like smeared glasses, greasy plates, and poor overall cleaning frequently come down to maintenance rather than a mechanical fault. Working through steps one to four in order resolves the problem in many cases. If the machine is still not cleaning after all six steps, that's the point to consider a professional diagnosis rather than keep running wash cycles and hoping.

When You Need Professional Help vs Sorting It Yourself

DIY fixes are worth trying first when the problem is a blocked filter, clogged spray arms, incorrect loading, or detergent issues. These cost nothing but a bit of time. If you've worked through the maintenance steps and the machine is still leaving dishes dirty, or if you're seeing any of the following, it's time to call an engineer:

• The machine is not filling with water at the start of a cycle
• There's standing water left in the bottom of the tub at the end of a cycle
• The detergent dispenser door is physically broken and not opening
• There are unusual noises during the wash - grinding, loud humming, or repeated clicking
• An error code is showing on the control panel
• Dishes come out cold to the touch, suggesting the machine isn't heating the water

A heating element replacement on a Bosch or Hotpoint dishwasher typically costs between 80 and 180 pounds for parts and labour. A pump replacement - needed when the machine isn't draining properly - commonly runs to between 100 and 200 pounds. When a dishwasher leaves dishes dirty, cloudy, or wet, diagnosing whether it's a maintenance issue or a component failure early saves money in the long run - a fault left untreated can sometimes cause secondary damage that increases the final bill.

If your machine is over ten years old and the repair cost is approaching half the price of a comparable new appliance, it's worth having an honest conversation about whether replacement makes more sense. Our engineers will always give you a clear view on this rather than push a repair that won't add long-term value.

What to Expect From a Repair Visit in Barnstaple

When you book an appliance repair engineer through Voltrade, here's what typically happens. The engineer arrives within the agreed time window and starts with a brief conversation about what the machine has been doing and how long the problem has been building. If you've got any error codes noted down from the display, share them - it speeds things up considerably.

On most calls in Barnstaple, our engineers carry common spare parts for the brands they see most often - Bosch, Hotpoint, Beko, LG - so if it's a spray arm, pump seal, door latch, or dispenser mechanism causing the problem, the repair can often be completed in the same visit. More unusual parts for less common models may need ordering, in which case you'll get a clear timeline and a fixed quote before anything is ordered or any work goes ahead.

A typical diagnostic visit costs between 50 and 80 pounds, which generally covers the assessment and any basic adjustments carried out on the day. If additional parts are needed, you'll receive a written quote first. There are no surprise charges added at the end of a job.

Common Questions From Barnstaple Homeowners

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

Cloudy glassware is almost always caused by one of two things: a limescale deposit from hard water, or etching caused by water that's too hot combined with too much detergent. Start by refilling your rinse aid reservoir and checking your machine's salt indicator - if the softener salt is low, hard water deposits build up quickly. Try a gentler, cooler wash programme for glasses and run a dishwasher cleaner through on a hot empty cycle to shift any internal scale. If the cloudiness doesn't improve after a few washes, the issue may be permanent etching on older glassware rather than a machine fault.

How often should I clean my dishwasher filter?

For a typical household running the dishwasher five or more times a week, cleaning the filter once a month is a sensible routine. If you're regularly putting heavily soiled pots and pans through without pre-rinsing, every two to three weeks is better. It takes about five minutes from start to finish and is the single most effective maintenance task you can do to keep cleaning performance consistent. Neglecting it for several months is the most common reason we're called out to dishwashers that appear to have stopped working but actually just need a proper clean.

Could the water pressure in my area be affecting wash performance?

It's possible, though less common than most people assume. Dishwashers have a fill valve that opens to let water in at the start of each cycle, and if pressure to the machine is low - due to a partially closed isolation tap under the sink or a kinked inlet hose - it can affect how well the spray arms perform. Check that the isolation tap behind or beneath the machine is fully open and that the hose isn't kinked or crushed. If the supply looks fine, the fill valve itself can wear out over time and may need replacing - that's a job for an engineer rather than a DIY fix.

Is it worth repairing an older dishwasher or should I just replace it?

The rule of thumb our engineers use is this: if the repair costs more than half the price of a comparable new machine and the dishwasher is over eight years old, replacement is usually the better value. A new mid-range Bosch or Beko dishwasher in the UK typically costs between 350 and 600 pounds. Repairs under 150 pounds on a machine that's otherwise in good working order almost always make financial sense. We'll always give you a direct assessment of whether a repair stacks up, including an honest view on how much life the machine is likely to have left after the work is done.