Dishwasher Not Cleaning Properly in Peterlee What to Check

Published August 2026 | Dishwasher not cleaning properly what to check

This guide walks you through the most common reasons a dishwasher stops cleaning effectively and how to diagnose each one at home. Whether you've got a Bosch, Hotpoint, Beko, or any other machine, this is aimed at homeowners in Peterlee who want to understand what's wrong before picking up the phone.

A dishwasher that leaves dishes grimy, spotty, or still covered in food residue is one of the most common appliance complaints our engineers deal with. The good news is that in many cases, the fix is well within reach of a careful homeowner - you just need to know where to look.

Before You Start - Safety First

Before you touch anything inside or around your dishwasher, there are a few safety basics to get right.

Turn the machine off at the mains and unplug it from the wall socket. Never work on a running or plugged-in appliance, even if you're only removing the filter or inspecting the spray arms. If your dishwasher is hard-wired - common with integrated models - switch off the relevant circuit breaker in your consumer unit and ideally tape it off so nobody accidentally flips it back on while you're working.

If the machine has just finished a cycle, allow 10 to 15 minutes for the interior to cool before reaching inside. The heating element, water, and interior surfaces can all retain significant heat after a cycle ends.

If you smell burning, notice any visible damage to wiring, or see signs of water leaking from the base of the unit, stop immediately and call a professional. Electrical faults are not something to diagnose yourself.

What You Will Need

Most of this process doesn't require specialist tools. Here's what to have nearby before you start:

• A soft brush or old toothbrush
• White distilled vinegar
• A small bowl or container
• A damp cloth or sponge
• A torch or phone light
• A replacement filter if yours turns out to be damaged - typically costs between 5 and 20 pounds depending on the brand
• Dishwasher cleaner tablets such as Finish or Dr. Beckmann

Time estimate: allow 30 to 60 minutes for a thorough check and clean. If you need to order a replacement part, factor in delivery time on top of that.

Step-by-Step Instructions

Step 1 - Check and Clean the Filter

The filter is the single most common cause of a dishwasher not cleaning properly, and it's the first thing our engineers check. Most modern machines - including popular models from Bosch, Samsung, and Beko - have a cylindrical filter sitting in the base of the drum beneath the lower spray arm.

Twist the filter anticlockwise and lift it out. If it's clogged with food debris, grease, or limescale, it can't drain water effectively, which means dirty water recirculates around your dishes during the wash. Rinse the filter under warm running water and use a soft brush to scrub away any build-up. If the mesh is torn or damaged, replace the filter - most are available for under 20 pounds from appliance parts retailers or directly from the manufacturer.

When refitting it, make sure the filter clicks firmly back into position. A loose filter causes almost as many problems as a blocked one.

Step 2 - Inspect and Clear the Spray Arms

The spray arms are the spinning components that distribute water across your dishes during the wash cycle. Each arm has small jets that can block with mineral deposits, food particles, or detergent residue - particularly in areas with hard water. Parts of County Durham can experience moderately hard water, and this kind of build-up in the jets is a common problem our engineers find on machines that haven't been maintained regularly.

Remove the lower and upper spray arms by unclipping or unscrewing them - refer to your machine's manual if you're unsure how. Hold each arm up to a light source and look through the jets. If you can't see clearly through them, use a toothpick or thin brush tip to clear the blockage. Rinse thoroughly before refitting, and check the arms spin freely once they're back in place.

Step 3 - Check Your Detergent and Rinse Aid

Using the wrong type, amount, or quality of detergent makes a noticeable difference to cleaning results. Our engineers in Peterlee regularly find that customers are either using too little detergent, have let the dispenser run empty, or are using tablets that have degraded from sitting in a damp cupboard.

Check that your detergent dispenser opens fully during the cycle. If a large item is loaded directly in front of the dispenser door, the tablet won't dissolve and drop into the wash at the right moment. Also make sure your rinse aid reservoir is topped up - rinse aid helps water sheet off dishes during drying and prevents the white spotting and filming that many people mistake for a cleaning fault.

If you've been using a budget own-brand detergent, it's worth switching to a recognised brand for a few cycles to see if results improve. The difference can be significant.

Step 4 - Look at How You Are Loading the Machine

Poor loading is one of the most overlooked causes of bad cleaning results. The machine may be working perfectly, but dishes come out dirty because they're blocking the spray arms or packed too tightly for water to reach all surfaces.

Check for these common loading mistakes:

• Bowls and cups facing upward rather than angled down, so water pools rather than drains
• Large pots, trays, or chopping boards blocking the rotation of the spray arms
• Glasses and mugs overlapping on the top rack
• Cutlery packed too densely in the basket - spread handles alternately up and down for better water coverage
• Non-dishwasher-safe items that may have warped and created an obstruction

Reorganise the load, run a short cycle, and check whether cleaning improves before going any further in your diagnosis.

Step 5 - Run a Hot Cleaning Cycle

Grease, limescale, and detergent residue can build up inside the machine itself - on the interior walls, door seal, and around the drainage system - and this affects overall wash performance over time. Running a dedicated hot service wash is a reliable way to clear it out.

Place a dishwasher cleaner tablet or a small bowl of white vinegar on the bottom rack with nothing else in the machine. Run the hottest, longest cycle available. For LG and Hotpoint owners, this is typically labelled "Intensive" or "Heavy" and runs at 65 to 70 degrees Celsius. The combination of heat and either product will dissolve grease and limescale and freshen the interior.

Doing this every one to three months keeps the machine running well - especially in Peterlee and the wider County Durham area where water hardness can accelerate limescale build-up on internal components.

Step 6 - Check the Water Temperature

Dishwashers need to heat water to between 50 and 65 degrees Celsius during a standard cycle to clean effectively. If the water isn't reaching temperature, dishes won't come clean and you may also notice a milky film on glassware that gets worse over time.

Check that the hot water inlet hose at the back of the machine isn't kinked or partially blocked. If your machine is connected to the cold supply only - which is common with integrated Bosch and Siemens models - then the internal heater is doing all the work. A failing heating element will cause a gradual and steady decline in wash quality and is a job for a qualified engineer rather than a DIY fix.

If you're unsure whether the issue is heat-related or something else, the Voltrade GoFIX diagnostic tool can walk you through your symptoms and help identify the likely component at fault before you book an engineer visit.

Step 7 - Check the Door Seal and Latch

A worn or dirty door seal can allow heat and steam to escape during the wash cycle, reducing the internal temperature and affecting cleaning performance across the whole load. Run your fingers around the rubber gasket around the door and look for cracks, tears, or areas where food and grime have built up in the folds.

Wipe the seal down with a damp cloth and check that the door latches firmly when closed. A door that doesn't shut properly may be interrupting the cycle or allowing heat loss throughout the wash. Replacement door seals for most brands including Hotpoint, Beko, and Indesit typically cost between 10 and 40 pounds and can usually be fitted by a confident homeowner with basic tools.

What to Do If This Does Not Fix It

If you've worked through all the steps above and your dishes are still coming out dirty, the problem is likely an internal component fault rather than a maintenance issue you can sort yourself.

The most common internal faults our engineers find after a thorough user-level check include:

• A faulty circulation pump - the pump that pushes water through the spray arms with enough pressure
• A blocked or faulty drain pump causing dirty water to sit in the machine between cycles
• A defective water inlet valve not allowing enough water into the drum at the start of the wash
• A broken temperature sensor or failing heating element affecting how hot the water gets
• Control board issues affecting how the cycle runs and how long each phase lasts

These are not DIY repairs. They involve accessing internal components, and on some Samsung and LG integrated models, that means partially dismantling your kitchen units to get the machine out. Use the Voltrade GoFIX tool to help narrow down which component is likely at fault based on your symptoms - it can save time and money when an engineer does visit.

When to Stop and Call a Professional

Some situations mean you should put down the toothbrush and call an engineer rather than continuing to investigate. Stop and get professional help if:

• The machine is making grinding, humming, or unusual noise during the wash cycle
• There's standing water left in the drum after the cycle ends
• The machine is tripping your circuit breaker or blowing a fuse
• You can see or smell burning from inside the machine
• Error codes are showing on the display - particularly E codes on Bosch models or F codes on Hotpoint and Indesit machines
• The machine is leaking from underneath or around the door

A professional appliance repair in Peterlee typically costs between 60 and 120 pounds for a call-out and diagnosis, with parts costs on top depending on what's needed. Replacing a circulation pump or motor in a mid-range Beko or Hotpoint machine might come to between 150 and 250 pounds all in - still considerably cheaper than buying a new appliance in most cases.

If your machine is more than 8 to 10 years old and facing a significant repair bill, it's worth having an honest conversation about repair versus replacement. Our engineers across County Durham will always give you a straight answer on whether a repair makes financial sense - there's no point putting money into a machine that's likely to develop another fault within six months.

Questions About This Process

Why are my dishes coming out with a white film even after a full cycle?

A white film or cloudy residue on dishes and glassware is commonly caused by limescale deposits from hard water, or by detergent that hasn't rinsed away properly. Start by checking your rinse aid level and increasing the rinse aid dispenser setting if your machine allows it. Running a descaling cycle with a dedicated dishwasher cleaner can help significantly. If the problem persists, a blocked spray arm jet or failing water softener unit inside the machine may need professional attention.

How often should I clean the dishwasher filter?

For most households in Peterlee running a dishwasher daily, cleaning the filter once a month is a reasonable minimum. If you're regularly washing heavily soiled pots and pans, fortnightly is better. In areas with harder water, it's also worth running a full descaling cycle every two to three months to prevent limescale affecting the spray arms and heating element. Keeping on top of both reduces the chance of a more serious blockage developing over time.

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

The general rule our engineers use is this: if the repair cost is more than half the price of an equivalent new machine, replacement is often the better call. For a mid-range machine under six years old, most repairs are worth doing. For older machines - particularly those more than 10 years old - it depends on which component has failed. A pump or motor replacement on an older Hotpoint or Beko may not make sense financially if other components are also showing wear.