Dishwasher Not Draining in Accrington - What to Check and When to Call a Pro

Published September 2026 | Dishwasher Not Draining

What Causes a Dishwasher to Stop Draining

Standing water in the bottom of your dishwasher is one of the most common appliance faults our engineers see across Accrington and the surrounding Lancashire area. The good news is that most causes are mechanical and predictable - there's rarely anything mysterious going on.

The most common reasons a dishwasher stops draining include:

• Blocked filter or sump area - Food debris, broken glass, and grease build up in the filter basket and the sump below it. This is the number one cause, particularly in households that don't pre-rinse plates.
• Kinked or blocked drain hose - The corrugated drain hose that runs from the pump to your sink waste or waste disposal can get kinked behind the unit or clogged with grease over time.
• Blocked sink waste or standpipe - If you've recently had a sink blockage or your kitchen plumbing is slow, the dishwasher water has nowhere to go. The machine fills the drain hose but can't push water out.
• Failed drain pump - The drain pump uses an impeller to push water through the hose. If it burns out or the impeller gets jammed by debris, the machine will hum but not drain.
• Faulty door latch or float switch - Less common, but a stuck float switch can make the machine think it's overfilling and halt the cycle.
• Control board or programme fault - On more modern machines from brands like Bosch, Beko, and Samsung, software faults can interrupt the drain cycle without any mechanical cause.

Older machines - we see a lot of ageing Hotpoint and Indesit models in Accrington homes - tend to suffer from pump and hose issues. Newer machines are more likely to throw an error code and need a reset or a software fix.

Step-by-Step: How to Diagnose a Dishwasher That Won't Drain

Before calling anyone out, work through these checks in order. Most of the time, you'll solve it before you reach step four.

Step 1 - Remove the standing water

Use a jug and some old towels to scoop or soak up the water sitting in the base. You need clear access to the filter. Don't bail it straight to the floor - the water is typically dirty and greasy.

Step 2 - Clean the filter assembly

Every dishwasher has a cylindrical filter and a mesh plate at the bottom of the tub. Twist the cylindrical filter anti-clockwise and lift it out, then remove the flat mesh filter beneath it. Rinse both under a hot tap, using a soft brush to scrub away grease and food debris. Check the sump underneath for broken glass or debris - a shard of glass jammed in there is surprisingly common and will stop the impeller spinning.

Step 3 - Check the drain hose

Pull the dishwasher out from under the worktop carefully. The drain hose connects at the back and runs either to a spigot on your sink waste pipe or into a standpipe. Check the whole length for kinks. Disconnect it at the sink end (have a towel ready) and check it's not blocked. You can blow through it to test - if air passes freely, it's clear.

Step 4 - Check where the hose connects to the sink

If your drain hose connects to a spigot on your waste pipe, remove the hose and check the spigot itself isn't bunged up with grease. If the machine drains into a standpipe, check the standpipe isn't blocked. Run your kitchen tap for a minute and watch whether the sink drains freely. A slow sink often means the dishwasher water has nowhere to go.

Step 5 - Run a short cycle and listen

With the filter clean and hose clear, start a short programme and listen at the start and end of the cycle. You should hear the drain pump running - it makes a distinct low hum for 20 to 30 seconds. If you hear nothing, or if you hear a loud buzzing that doesn't move any water, the pump itself may have failed.

Step 6 - Check for error codes

Most machines made in the last decade will display an error code if something is wrong. On Bosch and Siemens machines, an E24 or E25 code typically points to a drain blockage or pump fault. Samsung dishwashers often show a 5C or OC code for drain issues. LG machines may show an OE error. Look up the specific code for your make and model - it'll narrow things down significantly. The Voltrade GoFIX diagnostic tool can also help you identify what a fault code means and whether it's something you can fix yourself or needs a visit from an engineer.

DIY vs Professional Help - When to Do Each

There's a lot you can do yourself with a dishwasher drain problem, and we'd always encourage homeowners in Accrington to try the basics first. That said, there's a clear line between DIY territory and jobs that need someone with the right tools and experience.

Safe to do yourself

• Cleaning the filter and sump
• Checking and clearing the drain hose
• Clearing a blocked sink waste
• Resetting the machine (hold the start button for 5 seconds on most models, or switch off at the wall for a minute)
• Running a cleaning cycle with a dishwasher cleaner tablet

Call a qualified engineer for these

• The drain pump is making a loud noise but not moving water - the impeller may need replacing and accessing it requires pulling the machine apart
• The machine fills and then sits doing nothing - likely a control board or solenoid valve fault
• You've cleared the filter and hose and the problem keeps coming back after every couple of cycles
• There's a leak from underneath as well as the draining problem
• The machine is displaying a fault code that doesn't clear after a reset

In our experience, if you've worked through the steps above and still have water sitting in the base after a full cycle, you're past the point where DIY is going to help. At that stage, you need a diagnostic visit.

What a Qualified Appliance Engineer Will Do

When one of our engineers visits a home in Accrington with a dishwasher draining fault, the first ten minutes look a lot like the DIY steps above - experienced engineers still start with the basics because they're the most likely culprits. Here's what typically happens after that.

Full pump test. The engineer will access the drain pump - which on most machines means removing the lower spray arm and the sump cover - and test the pump motor directly. They'll check whether the impeller turns freely or whether it's seized by debris. They'll also test the pump electrically to confirm it's getting power and responding correctly.

Solenoid valve check. Some machines use a solenoid valve to control drain flow. If this is stuck closed, water won't move regardless of how well the pump is working. This is a common fault on older Hotpoint and Beko machines.

Control board inspection. On newer machines with electronic control boards, the engineer will check whether the board is sending the correct signal to the drain pump. A failed relay on the board can prevent the pump from activating at all even when the pump itself is fine.

Full drain cycle observation. After any repairs, a qualified engineer will run a complete cycle and watch the machine drain to confirm the fix holds. They won't leave until the machine has drained cleanly at least once.

The whole visit typically takes 45 minutes to an hour for a simple pump replacement, longer if a control board or wiring is involved.

Costs and What Affects the Price

Appliance repair costs in Accrington and across Lancashire vary depending on the fault, the machine, and parts availability. Here's a realistic breakdown of what to expect in 2026.

Call-out and diagnostic fee: Most engineers charge between 50 and 85 pounds just to visit and diagnose the fault. Some companies include this in the repair cost if you go ahead with the work; others charge it separately. Always confirm this upfront.

Drain pump replacement: This is the most common repair. Parts for mainstream brands like Bosch, Hotpoint, and Beko typically cost between 30 and 70 pounds. With labour, expect to pay between 100 and 160 pounds all in.

Solenoid valve replacement: Parts are cheaper - typically 20 to 40 pounds - and the job is quicker, so total costs usually come in between 80 and 130 pounds.

Control board replacement: This is where costs can rise sharply. Boards for premium brands like Bosch Serie 8 or Samsung can cost 150 to 300 pounds for the part alone. Total repair costs can reach 350 to 450 pounds, at which point the age of the machine becomes a factor in whether repair makes sense.

When repair doesn't make economic sense: A general rule is that if the repair costs more than half the price of a comparable new machine, replacement is worth considering. For a 5-year-old mid-range dishwasher that cost 350 pounds new, a 200-pound repair is borderline; for a 2-year-old Bosch that cost 600 pounds, a 250-pound repair is usually worth it.

How to Prevent Draining Problems in Future

Most draining issues are preventable with a bit of routine maintenance. These habits will keep your machine running reliably for years.

Clean the filter monthly. This is the single most effective thing you can do. It takes three minutes. Pull the filter out, rinse it under a hot tap with a brush, and replace it. Don't wait until you can see a blockage - by then, it's already causing problems.

Scrape plates before loading. You don't need to pre-rinse everything, but large food debris - bones, rice, leafy greens - should go in the bin before plates go in the machine. Modern dishwashers are designed to handle light food soil, not solid waste.

Run a hot maintenance cycle monthly. Use a proprietary dishwasher cleaner (brands like Finish and Fairy both make them) or just run the machine empty on its hottest programme. This dissolves grease in the pump and hose before it builds up into a blockage.

Check the drain hose position. The drain hose should run up high behind the machine before dropping down to the sink connection. This creates an air break that stops waste water from siphoning back into the machine. If your hose runs straight across at low level, water can sit in it and cause drain faults.

Leave the door ajar after cycles. Letting moisture escape after a wash prevents the build-up of biofilm inside the machine, which can eventually clog the filter and pump over time.

Homes in Accrington with hard water - and Lancashire water is notably hard in many areas - may find that limescale builds up in the pump and spray arms more quickly. Using a rinse aid and a monthly descaler tablet makes a real difference.

Frequently Asked Questions

Why is there always a small amount of water left at the bottom of my dishwasher - is that normal?

Yes, in most machines a small amount of water sitting below the filter level is completely normal. It's typically left there deliberately to keep the pump seal lubricated. We're talking a cup or two at most. If you can see water covering the filter or lapping at the base of the door, that's not normal and indicates a drain fault.

Can a blocked dishwasher filter cause other problems beyond poor draining?

Definitely. A heavily blocked filter restricts water circulation as well as drainage, which means dishes come out with food still on them, the machine runs hotter trying to compensate, and the pump has to work harder. Over time this shortens the life of the pump motor. Keeping the filter clean is good for the whole machine, not just the drain.

My dishwasher drains fine most of the time but occasionally leaves water in the bottom - what does that mean?

Intermittent draining faults are often caused by a partially blocked filter or a grease build-up in the drain hose that clears itself on some cycles but not others. It can also indicate a pump that's beginning to fail - it works when it's warm but struggles when cold. Either way, it's worth cleaning the filter thoroughly and running a maintenance cycle to see if that resolves it. If it keeps happening after that, a pump check is worthwhile before the problem becomes total failure.

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

Age, repair cost, and the machine's track record are all factors. A well-maintained 6 or 7-year-old machine from a reliable brand like Bosch or Miele that needs a pump replacement is usually worth fixing - these machines are built to last 10 to 15 years. A budget machine that's already had a couple of repairs and is now needing a control board is probably not. If in doubt, get a diagnostic visit first - knowing the exact fault lets you make an informed decision rather than guessing.

How long does a dishwasher drain pump replacement typically take?

On most mainstream machines, an experienced engineer can replace a drain pump in 45 minutes to an hour. The job involves removing the lower basket, filter, and sump cover, disconnecting the old pump, fitting the replacement, and testing. It's not a lengthy job, but it does require pulling the machine out and accessing the base, which is why it's best left to someone with the right tools and experience rather than attempted at home.