Dishwasher Not Cleaning Properly in Liverpool - What to Check Right Now

Published August 2026 | Appliance Repair

If your dishwasher is leaking water onto the floor or you can smell burning plastic or an acrid electrical odour during or after a cycle, switch it off at the mains immediately and do not use it again until a qualified engineer has inspected it.

Immediate Actions - Do These NOW

When a dishwasher stops cleaning properly, the fix is more often than not something you can sort yourself in under ten minutes. Our engineers see this kind of fault weekly across Liverpool, and it nearly always comes down to one of a handful of culprits. Work through these checks in order before calling anyone out.

1. Clean the filter. This is the single most common cause of a dishwasher not cleaning properly. The filter sits at the bottom of the machine, usually beneath the lower spray arm, and it traps food debris from every wash. If it's clogged, dirty water just circulates back over your dishes. Remove it, rinse it under a hot tap, and use an old toothbrush to scrub away grease and residue. On Bosch and Siemens models, the filter typically unscrews anticlockwise. Hotpoint and Beko machines usually have a two-part filter system - make sure you clean both sections thoroughly.

2. Check and clear the spray arms. The spray arms are the rotating plastic components with small jets that distribute water across your dishes. Those jets block up with limescale and food debris over time, which means water either can't reach the upper rack at all, or arrives with much less pressure than it should. Remove the spray arms (they usually pull off or unscrew) and hold them under running water. Use a cocktail stick or toothpick to clear any blocked holes. On LG and Samsung dishwashers, the upper spray arm is particularly prone to partial blockages that cause inconsistent results across the load.

3. Check the water supply. A machine that's not filling properly won't clean properly. Check the inlet hose behind the machine isn't kinked, and make sure the isolation tap on the supply line - usually found under the kitchen sink - is fully open. If the machine is filling and draining fine but still leaving food on dishes, this is less likely to be the root cause, but it's worth ruling out quickly.

4. Check your detergent and rinse aid levels. Using the wrong amount of detergent, or letting the rinse aid run out, causes more call-outs than most homeowners would expect. Too little detergent leaves food on dishes. Too much can leave a filmy residue that looks like poor cleaning. Check the dispenser drawer - on some machines it can stick or fail to open fully during the cycle, leaving the tablet sitting in the door instead of dissolving into the wash water. If the dispenser isn't opening, that's a separate mechanical fault to investigate.

5. Run a hot service wash. If the filter and spray arms are clear, run the machine empty on the hottest programme available - typically 70 degrees or a dedicated machine care cycle if your appliance has one. Add a dishwasher cleaner such as Finish Machine Cleaner or equivalent. This clears limescale from the heating element and internal components that a standard cycle won't shift. Liverpool sits in a moderate water hardness zone, but limescale still accumulates over time - particularly if rinse aid levels have been inconsistent.

What NOT to Do

Some of the things homeowners do when their dishwasher stops working properly make the problem worse, or turn a minor fault into a much more expensive repair.

Don't keep running it if there's a water leak. Water pooling beneath your dishwasher can damage kitchen unit carcasses and flooring within a single cycle, and in some cases it can reach electrical connections underneath the machine. If you spot water on the floor during or after a cycle, switch the machine off at the wall socket and investigate before running anything else.

Don't overload the machine. Overfilling a dishwasher is one of the most common causes of poor cleaning results, and it's something our engineers see on jobs right across Merseyside. Dishes need space for water jets to reach every surface. The lower basket should have clear channels for water to travel through, and items in the upper rack shouldn't be packed so tightly that they touch. Crucially, tall items in the lower basket can physically block the upper spray arm from rotating, meaning the top rack gets almost no water at all.

Don't use washing-up liquid. This sounds obvious, but our engineers have attended jobs in Liverpool where a homeowner ran out of dishwasher tablets and used fairy liquid as a substitute. It generates excessive foam, can overflow through the door seal, and puts strain on the pump. Only use detergent specifically made for dishwashers.

Don't ignore grinding or humming noises. These sounds typically suggest the wash pump or drain pump is struggling - possibly because debris has bypassed the filter and is obstructing the impeller. Continuing to run the machine risks burning out the pump motor entirely, which commonly costs between 80 and 150 pounds to replace. Catching it early is always cheaper than leaving it.

When This Is a Genuine Emergency vs When It Can Wait

A dishwasher that's cleaning poorly is frustrating, but it's rarely a life-safety emergency in the same way a gas leak or flooding from a burst pipe would be. That said, some dishwasher faults do need urgent attention rather than a wait-and-see approach.

Treat it as urgent if any of these apply:

• Water is leaking from the door seal, the base of the machine, or from the connections at the back
• You can smell burning plastic or an acrid electrical smell during or after a cycle
• The machine is tripping your fuse board or RCD when it starts up
• The motor is running but no water appears to be circulating
• You can hear loud banging or grinding that wasn't there before

In these cases, stop using the machine immediately. A leaking dishwasher that's still connected to power creates a real risk, and electrical faults in wet environments need professional assessment. Most appliance repair engineers across Merseyside can attend within 24 to 48 hours, and faster for anything involving water or electrical symptoms.

It can safely wait a few days if:

• Dishes are coming out with some food residue but no other worrying symptoms
• The machine completes its cycle normally but results are inconsistent
• There's clouding or spotting on glassware without any other issues

In these cases, work through the immediate action checks above first. A significant number of the repair calls our engineers attend turn out to be filter cleaning jobs that the homeowner could have sorted themselves in five minutes.

Getting Emergency Help in Liverpool

If you've worked through the checks above and the machine is still not cleaning, or if you're dealing with a water leak or electrical fault, it's time to get a professional in.

Use the Voltrade GoFIX diagnostic tool to describe your fault before booking. It helps our network of Liverpool appliance engineers understand exactly what they're walking into, which means they can arrive with the right parts and give you an accurate quote upfront - fewer wasted visits, faster turnaround.

For appliance repairs in Liverpool, our engineers typically charge a call-out fee of between 50 and 80 pounds, which usually covers the diagnosis and an initial portion of labour. Parts are charged separately. A replacement wash pump commonly runs between 60 and 120 pounds depending on the brand. A new control board or motor can push the total to between 150 and 300 pounds. For older machines, our engineers will always give you a clear assessment of whether repair makes financial sense against the cost of a replacement.

Most engineers across Merseyside carry common parts for Bosch, Hotpoint, Beko, and AEG machines on the van. For LG, Samsung, and certain Miele models, parts may need to be ordered in, which can add a day or two to the overall job time.

What the Repair Involves

When one of our engineers attends a dishwasher fault in Liverpool, here's what the diagnostic and repair process typically looks like.

Visual inspection first. Before anything else, the engineer will check the filter, spray arms, and door seal. These take only a few minutes to assess and rule out simple causes that don't require the machine to be pulled out.

Running a diagnostic cycle. Most modern dishwashers - particularly Bosch, Samsung, and LG models built in the last five years - have built-in diagnostic modes accessible through button combinations on the control panel. These surface fault codes that point directly to the component causing the problem, which speeds up diagnosis considerably.

Component testing. If a fault code points to the heating element, wash pump, or circulation pump, the engineer will test these with a multimeter. A heating element that's not reaching the correct temperature will leave dishes cold and greasy even when water circulation appears normal. A failing circulation pump often produces weak spray pressure across both racks.

Repair or replacement of the faulty part. Most internal components can be replaced in under an hour once the machine is pulled clear of the unit. Door seals, spray arm bearings, and detergent dispenser mechanisms are typically the quickest fixes. Pump replacements and control board swaps take longer and may require parts to be ordered if the machine is a less common model.

Common Questions Our Liverpool Engineers Get Asked

Why are my dishes still greasy after a full wash cycle?

Greasy dishes after a full cycle typically point to one of three things: a blocked filter preventing proper water circulation, a failing heating element that isn't getting water hot enough to cut through grease effectively, or insufficient detergent for the load size. Check the filter first, then verify your machine is reaching temperature by feeling the dishes immediately at the end of a hot cycle - they should be noticeably warm to the touch, not lukewarm. If they're cold, the heating element likely needs testing by an engineer.

Why is there white residue on my glasses and cutlery?

White film or spotting on glassware is almost always caused by limescale build-up or insufficient rinse aid. Check your rinse aid dispenser first - if it's empty or nearly empty, top it up and run a cycle to see if results improve. If the machine has been running without rinse aid for a while, a dedicated descaling product used on an empty hot cycle will help clear limescale from the heating element and spray arms. If the problem continues after that, the water softener inside the machine may need dishwasher salt replenishing.

My dishwasher sounds like it's working normally but nothing is getting clean - what's wrong?

If the machine completes its cycles and makes the right sounds but dishes come out dirty, the most likely cause is that water isn't physically reaching the dishes with enough pressure or coverage. Check that the upper and lower spray arms spin freely and that their jets aren't blocked. Also check that tall items in the lower basket aren't stopping the upper arm from rotating. If spray arms are clear and unobstructed, the wash pump may be delivering water at reduced pressure - a job for an engineer to test and assess properly.

Is it worth repairing my dishwasher or should I just replace it?

As a general rule, if the repair cost exceeds roughly half the price of a comparable new machine, replacement often makes more long-term financial sense - particularly if the appliance is more than eight years old. A new Beko or Hotpoint dishwasher can be bought for between 300 and 450 pounds, while a Bosch or Siemens with better energy ratings typically costs between 500 and 800 pounds. Our engineers will always give you an honest assessment before quoting for parts, so you can make a properly informed decision rather than spending money on a machine that's near the end of its useful life.