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
| Task | Frequency | Why |
|---|---|---|
| Clean filter | Monthly (fortnightly in hard-water areas) | Prevents food and scale blockages |
| Run a cleaner or descale cycle | Every 1--2 months | Clears mineral buildup from filter, pump, and hoses |
| Check drain hose for kinks | Every 6 months | Restricted hoses cause slow or incomplete drainage |
| Top up rinse aid | Every 1--2 months | Reduces scale on filter mesh and pump |
| Inspect sump area | Monthly | Catches debris before it reaches the pump |
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.
