How to Clean a Dishwasher

by Marsh | Jun 2, 2026 | Dishwasher Repair

Your dishwasher cleans your dishes every day. When did you last return the favour?

Most Australian households run their machine several times a week. But they never think about maintaining it. That catches up with you. Food particles pile up. Grease hardens. Hard water leaves its mark. Soap scum settles in. Spray arms clog. The filter turns into a science experiment. Bacteria and mould start growing. Next thing you know, your dishes come out dirty, your machine smells bad, and you have a fault that was totally preventable.

According to CHOICE Australia, most dishwasher problems start with a dirty filter. And the mould or bacteria that build up inside, in addition to being unpleasant, are genuine hygiene issues and potential health hazards. Regular cleaning keeps the machine running smoothly. It also genuinely extends its life. Worth the ten minutes.

National Appliance Repairs does dishwasher repairs across all major Australian cities. Truth is, many of the calls we get could have been avoided with routine maintenance. So here is how to do it properly.

How Often Should You Clean a Dishwasher?

• Filter: Inspect weekly, clean monthly (or as needed)
• Interior drum cycle (vinegar or commercial cleaner): Monthly
• Door seal and edges: Monthly
• Spray arms: Every three months
• Exterior: As needed

If your dishwasher is used heavily -- in a busy family home, a rental property, or a commercial setting -- increase the filter cleaning frequency to every two weeks.

What You'll Need

• White vinegar (1--2 cups)
• Bicarbonate of soda (half a cup)
• Dish soap
• An old toothbrush or soft-bristled scrubbing brush
• Microfibre cloths
• A toothpick (for clearing spray arm holes)
• Rubber gloves

Step-by-Step: How to Clean a Dishwasher

Step 1: Clean the Filter

Pull out the bottom rack. Look at the floor of the dishwasher. That cylinder? That's the filter. Most twist anticlockwise and lift out. Check your manual if it resists.

What you'll find inside: old food, grease film, sometimes black mould. Rinse it under hot water. Then fill a bowl with hot water and a squirt of dish soap. Soak it for five minutes. Scrub the mesh parts with an old toothbrush. Rinse again. Set it somewhere to dry.

Step 2: Clear the Spray Arms

Those little holes in the spray arms collect gunk over time. Remove the arms--they usually click off or unscrew by hand. Hold each arm under the tap. Poke a toothpick through every blocked hole you see.

If the holes are crusted with white scale, soak the whole arm in white vinegar for 15 minutes first. Then poke, rinse, and click them back in.

Step 3: Wipe the Door Seal and Edges

Run your finger along that black rubber strip around the door. Feels gritty? That is moisture, old food, and sometimes mould hiding in the folds. Grab a damp microfibre cloth and wipe every inch of that seal. Got dark spots? Dip the cloth in undiluted white vinegar and scrub them out.

While you are at it, wipe the door edges and the control panel. Grease splatter lands there more often than you realise.

Step 4: Clean the Interior with Vinegar

Put the racks back in. Leave the dishwasher empty. Set a heatproof cup or bowl with 1–2 cups of white vinegar upright on the top rack. No detergent. Run the hottest cycle your machine has got.

Vinegar cuts grease and dissolves mineral buildup. But here is the catch. Only do this once a month. Vinegar wears down rubber seals over time. Need to freshen things up weekly? Buy a dishwasher cleaning tablet instead. Much gentler on the machine.

Step 5: Deodorise with Baking Soda

When the vinegar cycle finishes, skip the detergent. Sprinkle half a cup of bicarbonate of soda across the dishwasher floor. Run a short hot cycle. The bicarb kills any leftover smells and gives the inside a mild scrub.

One rule: never put vinegar and baking soda in the same cycle. They react and neutralise each other. Separate cycles only.

Step 6: Replace the Clean Filter

Once everything has air-dried for a few minutes, put the clean filter back in. Replace the bottom rack. Then leave the dishwasher door slightly open--just a crack. That last step stops mould from coming back.

Dishwasher Cleaning Schedule

Common Signs Your Dishwasher Needs Cleaning (Or a Repair)

Regular cleaning stops most problems before they start. But if you notice any of the following, your dishwasher needs attention now.

• Cloudy, greasy, or still-dirty dishes. That usually means a blocked filter or spray arm.
• A bad smell coming from inside. Food trapped in the filter. Or mould hiding in the door seal.
• Visible mould around the seal or inside the drum.
• White film or mineral deposits on the walls. That's hard water scale--common in Adelaide, Melbourne, and Perth.
• Water pooling at the bottom after a cycle finishes. Could be a drain issue. Could be a blocked filter.

If cleaning doesn't fix dirty dishes, standing water, or strange noises during a cycle, you're probably looking at a mechanical fault. In that case, you’ll need to have it looked at professionally.

Tips to Keep Your Dishwasher Cleaner for Longer

• Scrape (but don't necessarily rinse) dishes before loading -- food particles are the primary source of filter blockages and bad smells
• Use the correct type and amount of dishwasher detergent for your water hardness -- excess detergent leaves residue
• Run the dishwasher on hot cycles regularly, especially if you normally use an eco or low-temperature setting
• If you have hard water, use dishwasher salt (if your model has a salt reservoir) to prevent mineral scale build-up -- this is particularly relevant in cities like Adelaide, which has notoriously hard water
• Leave the door ajar between uses where practical; this prevents moisture from sitting stagnant inside

FAQ

Why does my dishwasher smell even though I use it every day?

Using it every day actually makes the smell worse if you never clean the filter. Think about it. Every cycle dumps more food residue into that filter. That residue rots. Bacteria love it. Pull the filter out. It will probably look disgusting. Clean it. Then run a vinegar cycle. Smell will be gone.

Can I use bleach to clean my dishwasher?

Please don't. Bleach is terrible for stainless steel--it corrodes the metal over time. It also chews up rubber seals. You want a leaking dishwasher? Because that's how you get one. Stick with vinegar and baking soda. They are safer and they actually work.

How do I deal with hard water stains inside my dishwasher?

White vinegar does the job on light scale. Pour it in a cup, run a hot cycle. But if your dishwasher looks like a limestone cave, vinegar alone won't cut it. Get a commercial descaler. Use it every three to six months. And for the love of clean dishes, use dishwasher salt regularly. That stops new scale from forming.

Is it worth cleaning a dishwasher that's already several years old?

Absolutely. A clean old dishwasher runs better than a dirty new one. The seals last longer. The pump lasts longer. The spray arms actually spin instead of just dribbling water. Cleaning costs you maybe ten minutes. Replacing a pump costs you a few hundred dollars.

My dishwasher isn't draining after I cleaned the filter. What's wrong?

Stop cleaning. You have done what you can. If the filter is spotless and water is still sitting at the bottom, the problem is somewhere else. Could be a blockage in the drain hose. Could be the drain pump died. Either way, you cannot fix it with a toothbrush or a bottle of vinegar. Call someone who does this for a living.

Conclusion

The secret to a well-performing dishwasher is literally just spending 30 minutes cleaning it every month. Do the steps above consistently, and you’ll be able to catch most issues before they even start.

If your machine has developed a fault that cleaning hasn't resolved -- dishes coming out dirty, water not draining, or error codes appearing -- National Appliance Repairs is ready to help. Our qualified technicians service all major brands across Australia. Call 1300 434 380 for a free phone consultation.

Bosch Dishwasher E15 Error: Causes, Fixes, and When to Call a Technician

by Marsh | May 20, 2026 | Dishwasher Repair

“Water where it shouldn't be” – that's what the E15 code on the display of your Bosch dishwasher is telling you. Specifically, the sensor in the base tray of your Bosch dishwasher has detected moisture -- and as a result, the machine's AquaStop flood protection has kicked in, cut off the water supply, and left everything at a standstill.

It won't clear on its own. The error stays until the source of the water is found and dealt with.

National Appliance Repairs sees this fault regularly across homes in Melbourne, Sydney, Brisbane, Adelaide, and Perth. Some are straightforward. Some aren't. Here's how to tell the difference.

What AquaStop Actually Does

The AquaStop system is standard on most Bosch dishwashers. It’s a double-walled inlet hose that sits at the back of the machine, plus a float switch lives in the base pan. The moment water touches that float switch -- even a small amount -- it sends a signal to the control board to close off the inlet and hold the drain pump running. The E15 code appears on the display.

Bosch describes this as lifelong flood protection. The trade-off is that it's sensitive by design, so even minor seepage that has pooled over time will trigger it.

What Causes the E15 Error

Several different failure points can let water into the base pan:

• Worn door seal: Daily use degrades the rubber gasket around the door edge. Water begins escaping during the wash cycle and runs down into the base. This is the most common cause.
• Loose or cracked inlet hose: The connection points where the hose meets the machine can loosen over time, or the hose itself can crack. Water drips into the base rather than the tub.
• Leaking sump seal: The sump sits at the very base of the tub. Its seal wears gradually and is one of the more frequent E15 culprits in older Bosch machines.
• Inlet valve not closing fully: A valve that sticks open allows water to continue trickling in after the fill phase ends. Over multiple cycles, enough accumulates in the base to trip the float.
• Cracked tub: Less common, but physical damage to the dishwasher's interior can allow water to bypass the tub entirely.
• Faulty float switch: Occasionally the switch itself is the problem -- stuck or corroded, it reads a leak that isn't there. A technician can test this quickly.

What Not to Do First

One piece of advice that circulates in Australian home improvement forums is to tilt the dishwasher forward to drain the base pan. Don't do this. Tilting shifts the pooled water toward the machine's electrical components at the back, which can turn a manageable repair into a far more expensive one.

When E15 appears:

• Switch the machine off at the power point
• Turn off the water supply tap behind the dishwasher
• Leave the machine upright -- do not run another cycle
• Put towels down if there's visible moisture on the floor around the base

What You Can Check Yourself

A few checks are worth doing before calling anyone out:

• Run your finger along the door seal, looking for tears, flat spots where the rubber has lost its shape, or food and detergent residue preventing a full seal
• Follow the inlet hose from the back of the machine and check for kinks, cracks, or loose connections at either end
• Look around the base of the machine for any sign of where moisture is originating

That's roughly where DIY ends for E15. Accessing the sump seal, testing the inlet valve, or replacing the float switch all require removing machine panels and working near live electrical components. Under Australia's Model Work Health and Safety Laws, this work should be handled by a licensed technician.

What a Technician Does on an E15 Job

Keeping E15 Away

Regular habits that make E15 less likely:

• Wipe the door seal periodically to stop detergent and food residue from degrading the rubber
• Run a hot maintenance cycle monthly with a dishwasher cleaner -- it flushes mineral deposits from hoses and the inlet valve
• Every six months, pull the machine out slightly and check the inlet hose connection at the back for loosening, particularly if the dishwasher vibrates noticeably during operation
• If the machine gets heavy daily use, a service check every two years is worth doing before a fault develops

FAQ

What does E15 mean on a Bosch dishwasher?

The AquaStop flood protection has detected water in the base pan. The water inlet shuts off automatically. The error won't clear until the source of the water is identified and fixed.

Can I reset E15 and keep using the dishwasher?

Resetting clears the display, not the leak. Running the machine again will almost certainly retrigger E15 and risks more water reaching your floor and cabinetry. Get the leak fixed first.

Is E15 always an actual leak?

Usually. In rare cases a faulty or stuck float switch triggers E15 with no real leak present. A technician can confirm this by testing the switch directly.

How long does a Bosch E15 repair take?

If the technician has the right part -- door seals and inlet hoses are commonly stocked on the van -- the repair is typically done on the same visit. Parts that need to be ordered may mean a return visit within a few days.

Does Australian consumer law cover an E15 repair?

It depends on the cause. Manufacturing defects are covered under the Australian Consumer Law, which requires goods to be of acceptable quality and last a reasonable time. Normal seal wear on a heavily used older machine is generally a maintenance matter rather than a warranty claim.

Conclusion

E15 is one of the Bosch dishwasher faults you shouldn't put off. The AquaStop system stopped the flooding -- but the leak is still there, and the next cycle will just trigger it again. Get the door seal, hoses, and sump inspected before the machine runs again.

If you're in Sydney, Melbourne, Brisbane, Perth, or Adelaide, National Appliance Repairs can have a qualified technician to your door the same day, with upfront pricing and a 12-month warranty on all parts.

Bosch Dishwasher E22 Error: What It Means and How to Fix It

by Marsh | May 19, 2026 | Dishwasher Repair

You open the dishwasher after a cycle and find water sitting in the bottom of the tub, E22 on the display. Nine times out of ten, the fix is cleaning a filter that hasn't been touched in months. This one you can usually handle yourself.

Here's what's happening and how to sort it out. For repairs that go beyond a blocked filter, National Appliance Repairs services Bosch dishwashers across Australia's major cities, with same-day availability and a 12-month parts warranty.

What E22 Actually Means

The E22 code fires when the pressure sensor detects standing water in the sump -- the basin at the base of the tub beneath the filter -- after the drain phase. The machine stops the cycle rather than keep running with water it can't shift.

It's worth knowing how this differs from other drainage codes. E22 points squarely at the filter and sump area. E24 is a drain path issue -- a kinked hose, blocked connection, or check-valve problem. If you're seeing E24, the filter clean below won't fix it.

Start With the Filter

This clears E22 in most cases.

Turn the dishwasher off at the power outlet. Pull out the bottom rack. At the base of the tub you'll find two filters: a cylindrical coarse filter on top and a flat fine mesh filter beneath it. Rotate the coarse filter anti-clockwise and lift it out, then remove the mesh filter underneath.

Rinse both under warm running water and scrub with a soft brush -- an old toothbrush is fine. White chalky deposits are mineral scale. If there's significant buildup, soak both filters in warm water with a splash of white vinegar for 20 minutes before scrubbing. Reseat the mesh filter first, then the cylindrical one, turning it clockwise until it locks.

Run a short cycle and see if the code clears.

If the Filter Was Clean

A clean filter with a returning E22 narrows things down:

• Non-return valve: A small rubber or plastic flap near the drain outlet. If it's jammed open by a food fragment, water backflows into the sump after each drain attempt. Check it moves freely.
• Drain hose: Trace the hose from the back of the machine to the connection under the sink. Look for kinks, sharp bends, or compression against cabinetry. Also check the hose end isn't sitting submerged in water under the sink -- that creates a siphon that blocks drainage.
• Pump area: With the filters removed, shine a torch into the sump cavity. Glass fragments and small plastic pieces sometimes get past the filter and jam the pump impeller. If you can see debris, remove it carefully with needle-nose pliers before reassembling.

Why Some People Get E22 Repeatedly

Two things make E22 a recurring problem rather than a one-off:

Water hardness. Mineral content in Australian tap water varies considerably by region. Adelaide and Perth sit at the harder end, and homes there tend to see scale accumulate in filters and drain components faster than the manufacturer's maintenance schedule accounts for. The Australian Drinking Water Guidelines outline hardness ranges across the country -- if your area runs hard, clean the filter more often than the manual suggests and run a descale cycle monthly. Running the spray arms under the tap when you do the filter clean is worth doing too; the holes block with the same mineral deposits.

Detergent and rinse aid habits. Too much detergent leaves residue that accumulates on the filter mesh. Skipping rinse aid in a hard-water area accelerates scale buildup on both the filter and the pump. Neither fix is expensive.

Maintenance to Keep E22 Away

When to Call a Technician

Clean filter, clear drain hose, no visible blockage in the sump -- and E22 is still there. At that point the fault is in a component: the non-return valve may have failed outright rather than just being blocked, the pump chamber clip may need reseating, or the drain pump itself is struggling. Any of these needs a technician. Working near the pump with the machine live is an electrocution risk, and the Australian Consumer Law is worth knowing about if the fault turns out to be a manufacturing defect on a machine that isn't old.

Unusual sounds during the drain cycle -- grinding, rattling, a pump that hums but doesn't shift water -- are useful information for the technician and worth noting before they arrive.

FAQ

Can I run the dishwasher with E22 showing?

No. The cycle is locked until drainage is restored. Running it won't override the error.

How long does clearing E22 take?

Cleaning the filter is 10 to 15 minutes. Checking the drain hose and sump adds another 20 to 30. If none of that works, it's time to book a technician.

Will vinegar dissolve the scale on the filter?

Yes. Soak the filter in white vinegar for 20 to 30 minutes and most scale comes off with light scrubbing. It won't damage the mesh.

How do I know if it's E22 or E24?

E22 is standing water in the sump with the filter as the primary suspect. E24 means water can't exit through the drain line -- kinked hose, improper installation, or a drain pump or check-valve fault. Different parts of the system.

Does the 12-month parts warranty cover E22 repairs?

National Appliance Repairs backs all repair work with a 12-month parts warranty and 3-month labour warranty. If a replaced part fails within that period, it's covered.

Conclusion

Most E22 errors come down to a filter that's overdue for a clean. Pull it out, scrub it, check the sump for debris, reseat everything, and run a cycle. If the code returns, the non-return valve or drain pump needs a look. National Appliance Repairs has Bosch-experienced technicians across Sydney, Melbourne, Brisbane, Perth, and Adelaide -- call 1300 434 380 to book, same-day where available.

What Those Bosch Dishwasher Error Codes Actually Mean (E15, E22, E24 and E25)

by Marsh | May 18, 2026 | Dishwasher Repair

A Bosch dishwasher that stops mid-cycle and flashes a code isn't being difficult. It's telling you exactly what's wrong, in a language most people have never learned to read. Codes E15, E22, E24 and E25 are four of the most common faults Bosch owners run into, and they all point to real, fixable problems rather than a dying machine.

This guide breaks down what each code means, what typically causes it, and which ones are safe to check yourself before calling in a professional. National Appliance Repairs services Bosch dishwashers across Melbourne, Sydney, Brisbane, Adelaide and Perth, so we see these codes on a regular basis.

How Bosch Error Codes Work

Bosch dishwashers use a control board that constantly monitors water level, drainage, and leak sensors. When something falls outside the expected range, the board locks the wash cycle and displays a two-digit code so the fault can be identified quickly rather than guessed at. Bosch shares this system across its own dishwashers and those made by sister brand Siemens, which is why the codes look similar across both.

E15: Leak Protection Has Been Triggered

E15 means the dishwasher's leak protection system, sometimes called AquaStop, has detected water sitting in the base pan underneath the tub. Rather than let that water spread, the machine shuts everything down.

Common causes include:

• A worn or damaged door seal letting water escape during the wash
• A cracked or loose hose connection
• Overfilling caused by a stuck float switch
• Excess suds from using the wrong detergent, causing overflow

If E15 appears once and doesn't return, it may have been a one-off overflow. If it keeps coming back, there's an active leak somewhere in the system, and continuing to run the dishwasher risks water damage to your kitchen floor and cabinetry.

E22: The Filter Is Blocked

E22 is usually the simplest of the four to resolve. It means the fine filter at the base of the tub has become clogged with food debris, grease, or limescale, restricting water flow enough that the machine can't complete its cycle properly.

Regular filter cleaning prevents this from recurring. Bosch recommends removing and rinsing the filter assembly every few weeks, more often in households that don't pre-scrape plates.

E24: Drainage Failure

E24 shows up when the dishwasher can't drain water out at the end of a cycle. The most common causes are:

• A clogged drain filter or hose
• A kinked or incorrectly installed drain hose causing siphoning
• Debris caught in the drain pump

Because E24 and E25 both relate to drainage, it's worth checking the filter first (see E22 above), since a blocked filter often triggers both codes over time.

E25: Drain Pump Blocked or Disconnected

E25 points specifically to the drain pump. Either something is physically blocking the impeller, such as a piece of glass or a stray label, or the pump cover has come loose or wasn't reattached correctly after a previous clean.

This one usually requires removing the pump cover to inspect the impeller directly, which is a fiddly job and easy to get wrong on newer VarioDrawer or premium quiet models where components are more tightly packed.

Bosch Error Code Quick Reference

When to Call a Professional Instead

Cleaning a filter or checking a hose for kinks is reasonable weekend maintenance. Call a technician if:

• The same code returns after you've cleaned the filter and checked the hoses
• You see active dripping, pooling water, or corrosion around the base
• The dishwasher won't start at all after the fault
• You're not comfortable pulling the unit out from under the bench

Persistent E15 in particular shouldn't be left to run its course. A leak that keeps triggering the safety system is telling you it's still there, and letting a dishwasher run with an active leak risks water damage that costs far more than the repair itself.

While National Appliance Repairs isn't an official Bosch authorised service centre, our technicians are trained on Bosch's engineering and carry genuine parts for common faults across our vans. Many drainage and filter-related repairs on our dishwasher repair service are completed the same day, and every repair carries our 12-month parts and 3-month labour warranty.

Frequently Asked Questions

Can I keep using my Bosch dishwasher if E22 keeps coming back after I clean the filter?

No. If E22 returns after a proper filter clean, there's likely a secondary blockage in the spray arm, drain hose, or pump that a filter clean alone won't fix. Continued cycles with a partial blockage can strain the pump motor.

Is E15 dangerous to ignore?

It can lead to water pooling under the dishwasher, which risks damage to flooring and cabinetry, and in some cases electrical components near the base of the unit. If E15 reappears after drying the base pan, treat it as an active leak rather than a one-off.

Are Bosch and Siemens dishwasher error codes the same?

Largely, yes. Bosch and Siemens are both part of the BSH Group and share much of the same control board platform, so the core E-codes generally match across both brands, though some model-specific sub-codes can differ.

How much does it cost to fix a Bosch dishwasher error code?

It depends on the cause. A filter clean or hose adjustment is typically low-cost, while a drain pump replacement or door seal repair is more substantial. Call 1300 434 380 for a free phone consultation and a ballpark estimate before booking.

Will fixing an error code myself void my Bosch warranty?

Basic maintenance like cleaning the filter generally won't affect your warranty. More invasive repairs, especially anything involving the pump or control board, are best left to a professional to avoid voiding cover or causing further damage.

Getting Your Bosch Dishwasher Back on Track

Most of these four codes trace back to a handful of causes: a blocked filter, a worn seal, or debris in the drain system. Regular filter cleaning prevents a good portion of these faults from happening in the first place, and catching a leak code early is far cheaper than dealing with water damage later.

If your Bosch dishwasher keeps throwing the same code after basic troubleshooting, National Appliance Repairs services Bosch appliances across Australia's metro areas with same-day appointments where available.

Contact us or call 1300 434 380 for a straightforward diagnosis and upfront quote.

Bosch Dishwasher E24 Error: Drainage Fault Explained (And How We Actually Fix It)

by Marsh | May 14, 2026 | Dishwasher Repair

An E24 error on your Bosch dishwasher is a drainage fault. The machine is reporting that water should have drained during a particular phase of the cycle, but it detected water still present in the tub.

After 15+ years of Bosch service calls across Australia, we can tell you this: Bosch's error codes are accurate. If your Bosch is showing E24, there's a genuine drainage issue. Bosch machines aren't prone to false positives like some brands.

The good news? The fix is usually straightforward.

What Makes Bosch E24 Different From Other Drainage Errors

Bosch uses different pressure sensing technology than many competitors. The E24 code specifically indicates the machine has detected water at a point in the cycle where drainage should be complete.

This is more precise than a generic "drainage problem" error. Bosch is telling you: "Drainage started but didn't finish. Something is blocking the water from leaving."

In our experience, this points to one of three specific issues:

• A blockage in the dishwasher's internal drain path (filter, pump, or internal hose).
• A blockage or obstruction in the external drain hose or your home's plumbing.
• A failing pump that can't generate enough pressure to move water out.

We can usually diagnose which one over the phone by asking about when the error appears and how the machine sounds.

E24 Error Diagnosis Table

What We Actually Find When We Service Bosch E24 Errors

The internal pump filter clogged. This is the #1 culprit in Bosch dishwashers, accounting for roughly 65% of E24 errors we diagnose. Bosch filters are fine-mesh, designed to catch small particles. They're effective -- maybe too effective, because they get blocked easily.

We open Bosch machines and find filters absolutely packed with debris. Food particles, bits of broken glass (from broken dishes), fibers from sponges, sand from vegetables. In an Adelaide home, we found a filter so clogged with mineral deposits (hard water buildup) that water could barely trickle through.

The filter looks small and innocent from the outside. But internally, it's working hard and accumulating everything.

The pump itself impaired or worn. Bosch pumps are robust, but after 10+ years of constant use, they wear. The impeller (the spinning part) can become less efficient, moving water more slowly. This might not cause an immediate failure, but it can cause partial drainage that triggers the E24 code.

We've found pumps where the impeller had visible wear grooves from years of pushing water and debris.

The drain hose kinked or blocked. Bosch machines route the drain hose in a specific way. If it's been moved, renovated around, or if something has come loose, the hose can kink right where you can't see it.

We regularly find the hose twisted at an angle inside the cabinet space, restricting flow.

A partially blocked non-return valve. Some Bosch models (especially older ones) have a one-way valve in the drain circuit. If this valve has debris caught in it or mineral deposits restricting the opening, water backs up.

Your home's drain system. This accounts for about 15% of E24 errors we see. The dishwasher is trying to drain, but your sink is clogged or your home's plumbing is backed up. The dishwasher can't push water into an already-full pipe, so water backs up into the tub.

What We Do to Fix E24

1. Remove Standing Water

First, we drain any water still in the tub. We locate the emergency drain hose (usually at the bottom of the machine, bottom-left), place a bucket underneath, and let it flow.

2. Access the Pump Filter

We open the service panel and locate the pump filter chamber. This varies by model, but it's usually accessible from the bottom front.

3. Inspect and Clean the Filter

This is where we almost always find the problem. We remove the filter, and if it's blocked, we clean it thoroughly.

For stubborn blockages, we soak the filter in hot water for 15 minutes, then use a soft brush to clear debris. We never use harsh scrubbing that could damage the fine mesh.

4. Test the Pump

If the filter is clean, we run water through the pump chamber to ensure it's flowing. We listen for the pump to engage and verify water is actually moving.

5. Check the Drain Hose Path

We follow the entire drain hose from the machine to where it connects to your plumbing. We straighten any kinks and ensure it's routed correctly.

6. Run a Test Cycle

After addressing the blockage (or replacing the pump if necessary), we run a short cycle to verify drainage works. No error code means it's fixed.

When You Can Handle E24 Yourself

If you're mechanically inclined and comfortable accessing your dishwasher's internal components:

Consult your Bosch manual (available online for most models). Locate the pump filter. Remove it carefully. Rinse it thoroughly under warm water, paying special attention to clearing the fine mesh.

If the filter was visibly blocked and clogged, cleaning it alone might solve the E24 error. Run a test cycle.

If the filter was clean or cleaning didn't solve it, stop there and call us. The problem is the pump, the valve, or your home's plumbing -- all requiring professional diagnosis.

Don't attempt:

• Disassembling the pump itself
• Cleaning the internal drain hose without proper tools
• Forcing anything apart to access components
• Testing the pump's electrical connections

These require proper equipment and training.

Avoiding E24 Errors

These habits keep Bosch dishwashers draining properly:

• Pre-rinse or scrape dishes thoroughly -- Less debris reaching the filter means fewer blockages
• Clean the pump filter quarterly if you run the machine frequently
• Use rinse aid -- Bosch recommends this, and it helps water flow cleanly, reducing sediment
• Run the machine with full loads -- Partial loads create uneven water distribution
• Don't overload excessively -- It affects circulation and drainage
• In hard-water regions, descale monthly -- Use a commercial dishwasher descaling product to prevent mineral buildup
• Have the machine serviced every 3-5 years -- Professional maintenance catches problems early

Frequently Asked Questions

What's the difference between Bosch E24 and other brand drainage errors?

Bosch codes are very specific. E24 means drainage was attempted but didn't complete. This precision helps us diagnose quickly. Most E24 errors are filter blockages, not pump failures.

How much does it cost if the filter is clogged vs. if the pump failed?

Filter cleaning: just a service call ($100-150). Pump replacement: $400-600 total. It's worth doing the filter check first since it solves 65% of E24 errors.

Can hard water cause E24 errors more frequently?

Yes. In Adelaide and hard-water regions, mineral deposits accumulate faster in the filter. We recommend descaling your Bosch monthly in hard-water areas and having the filter professionally cleaned annually.

Is it safe to run the dishwasher if it's showing an E24 error?

We don't recommend it. Each cycle adds water that won't drain, risking overflow, water damage, or worse blockages. Troubleshoot first, then run a test cycle.

Can E24 be a plumbing problem, not a dishwasher problem?

Yes, about 15% of the time. If your sink drains slowly or your home's plumbing is backed up, the dishwasher can't drain even if it's working fine. Check your sink first.

The Bosch Advantage

Bosch machines are built to last. The E24 error, while frustrating, usually indicates a fixable problem -- not a catastrophic failure. In our experience, most E24 errors are resolved with filter cleaning or a drain hose adjustment.

The machine itself is fine. Something is just blocking the water's path.

Call National Appliance Repairs for Bosch dishwasher E24 service.

Call 1300 434 380 to book service in your area (Melbourne, Sydney, Brisbane, Perth, Adelaide). Our office team is available Monday-Friday 8:30 AM–7:00 PM, Saturday 8:30 AM–4:30 PM.

We service all Bosch dishwasher models and can usually diagnose an E24 error over the phone. Often it's a simple fix. And with our 12-month parts warranty, you're covered if anything fails after repair.

Dishwasher Not Drying Dishes: Causes and Fixes

by Marsh | May 13, 2026 | Dishwasher Repair

Dishes come out clean but dripping. You open the door and everything needs a towel. It's one of those faults that feels bigger than it usually is -- in a lot of cases, the fix costs nothing and takes two minutes.

This guide covers every cause in order of how likely it is, from the ones you can sort right now to the component failures that need a technician. If yours turns out to be the latter, National Appliance Repairs services all major dishwasher brands across Melbourne, Sydney, Brisbane, Perth, and Adelaide.

Two Drying Systems -- Know Which One You Have

Your dishwasher dries one of two ways, and that changes which faults are even possible.

Heated drying runs an element at the base of the tub to warm the air during the dry cycle, then a vent or fan pushes moisture out. Dishes come out warm and dry. Most Electrolux, Simpson, Miele, and older Bosch dishwashers work this way.

Condensation drying skips the element entirely. The hot final rinse heats the dishes; moisture condenses on the cooler stainless-steel walls and drains off. Current Bosch models and several other European brands use this method. It works well on glass and ceramics -- plastics always take longer because they shed heat quickly, and that's normal rather than a fault.

If your machine uses condensation drying, it has no drying element to fail. A few of the faults below simply won't apply to you.

Rinse Aid -- Check This First

Empty or low rinse aid is the single most common cause of wet dishes, and it affects both drying systems. Rinse aid reduces water's surface tension so it sheets off dishes rather than forming droplets that cling and dry as spots. Without it, even a perfectly functioning machine leaves things damp.

Check the rinse aid indicator next to the detergent dispenser. If it's low, refill it. If you've been running all-in-one tablets without liquid rinse aid, add it back -- most manufacturers are clear that tablets don't fully replace it for drying performance.

In hard-water areas like Perth and Adelaide, rinse aid matters even more. The Australian Drinking Water Guidelines show significant mineral variation across Australian states, and higher-mineral water leaves more residue on dishes and demands more rinse aid to compensate.

If the dispenser is full but dishes are still wet, the dispenser flap mechanism may not be opening during the cycle. A technician can replace it cheaply.

Wrong Cycle

A lot of quick-wash and eco cycles skip or shorten the heated dry phase. If you've been defaulting to a short cycle, switch to a full heavy or intensive wash and make sure the heat dry option is selected. On Bosch condensation-drying models, the ExtraDry or Intensive setting adds a hotter final rinse specifically to improve drying results.

How the Racks Are Loaded

Dishes packed too close together trap moisture between surfaces and block airflow. Large flat items lying face-down on the bottom rack pool water in their centres. Cups and bowls need to face down and inward so water drains off rather than collecting.

Plastics on the top rack is a good rule regardless -- they dry poorly anywhere, but the top rack keeps them away from the heating element on machines that have one.

Faulty Heating Element

On heated-drying machines, a failed element is the most common hardware fault behind wet dishes. When it goes, dishes come out clean, cold, and wet.

A quick test: run a sanitise cycle. If the sanitise light blinks rather than glowing steadily after the cycle, the element isn't reaching the required temperature. You can also look at the circular element at the base of the tub -- cracks, dark spots, or visible breaks are usually easy to see. A multimeter test for continuity gives a definitive answer.

Elements for most major brands cost $80--$150 in parts.

Faulty High-Limit Thermostat

The high-limit thermostat sits alongside the heating element and prevents the machine overheating. When it fails in the open position, it cuts power to the element before it can heat the air properly. The symptom looks identical to a failed element -- clean but cold and wet -- so a multimeter test is the only way to distinguish between the two.

Blocked or Faulty Vent Fan

Some machines use a vent and fan to actively push moist air out of the tub during drying. If the vent is blocked or the fan motor has failed, the moisture stays inside. You might notice the door interior unusually humid when you open it, or water beading on the inside of the door. The fan motor can be tested for continuity; the vent flap is visible and can be checked for debris.

Opening the Door at the Right Time

On condensation-drying machines, leaving the door closed after the cycle finishes allows steam to condense back onto the dishes. Cracking the door open by a few centimetres about 15 minutes after the cycle ends helps considerably. Many newer Bosch and Miele models now do this automatically.

What Each Fault Looks Like in Practice

A Note on Plastics

Even when a dishwasher is working perfectly, plastics come out wetter than glass or ceramic. Plastic doesn't hold enough heat to keep evaporation going through the dry cycle. A quick towel-dry or 20 minutes with the door open usually does it. If your glasses and plates are dry but your Tupperware isn't, the machine is fine.

FAQ

Why are my dishes wet even on heated dry?

If they're cold and wet, the heating element or thermostat has likely failed. If they're warm but slightly damp, check the rinse aid first -- it's the most common cause even on machines with a working element.

Do all-in-one tablets replace rinse aid?

Most manufacturers say no. Tablets contain some rinse aid agents, but not enough for consistent drying -- especially in hard water. Using liquid rinse aid separately gives noticeably better results.

Why does my Bosch dishwasher leave dishes wetter than my old machine?

Current Bosch models use condensation drying rather than a heated element. It works well on glass and ceramics but less so on plastics. Using the ExtraDry setting and opening the door slightly at cycle end both help.

Can overloading really affect drying?

Yes. Water collects in any concave surface facing upward, and tightly packed dishes prevent airflow from reaching everything. Proper loading makes a real difference.

Should I book a repair if the dishwasher cleans well but doesn't dry?

Try rinse aid and cycle settings first. If dishes are still cold and wet after that, the heating element or thermostat needs testing -- that's when to call a technician.

Conclusion

Most dishwasher drying problems are free to fix. Rinse aid, cycle selection, and loading cover the majority of cases. If dishes come out cold and wet after addressing those, a component has failed and needs testing. National Appliance Repairs carries heating elements, thermostats, and dispenser components for all major brands and can usually complete the repair on the same visit. Call 1300 434 380 or book online.