If your Bosch dishwasher has suddenly stopped mid-cycle and is showing a flashing code on its display panel, you’re not alone. Error codes are one of the most common reasons Australians reach out to us at National Appliance Repairs for help with, and Bosch dishwashers are some of the most popular models in homes across Sydney, Melbourne, Brisbane, Perth, and Adelaide.
These error codes are how your dishwasher’s communicating exactly what’s wrong, and if you can read them, you can understand what caused it and, for the handier folks out there — decide if it’s a DIY job or something to leave to a professional technician.
How Bosch Dishwasher Error Codes Work
Modern Bosch dishwashers are fitted with sensors that continuously monitor water levels, temperature, drainage, and door seals. When something falls outside expected parameters, the control board logs a fault and shows an alphanumeric error code — usually beginning with “E” — on the display. This system makes fault-finding much more straightforward than it was on older appliances that simply stopped working without explanation.
Some errors are minor and resolve after a simple reset. Others point to a failing component that needs professional attention before the problem causes further damage to the machine or your home.
Bosch Dishwasher Error Codes: Complete Reference Table
| Error Code | Meaning | DIY Fixable? |
|---|---|---|
| E01 / E1 | Control board fault | No — requires technician |
| E09 / E9 | Heating element failure | No — component replacement needed |
| E15 | Water in base pan / AquaStop activated | Sometimes — see below |
| E16 | Water inlet fault (overfill) | Sometimes |
| E17 | Water temperature too high on intake | Sometimes |
| E22 | Filter blocked / water not draining | Yes — clean filter first |
| E23 | Drain pump fault | No — pump replacement likely needed |
| E24 | Drain hose / pump blockage | Sometimes |
| E25 | Drain pump cover loose or blocked | Sometimes |
| E27 | Low voltage supply | Check power supply |
The Most Common Bosch Dishwasher Error Codes
E15: Water in the Base Pan
The E15 error is one of the most frequently seen Bosch dishwasher faults in Australian homes. It means the AquaStop flood protection system has been triggered because water has collected in the base tray of the machine. When the float switch in the base pan detects moisture, it shuts off the water supply and displays E15 to prevent water damage to your kitchen floor and cabinetry.
Common causes include:
- A worn or damaged door seal allowing water to seep out
- A cracked or loose water inlet hose
- A leaking sump seal at the base of the machine
- A faulty water inlet valve
Some guides suggest tilting your dishwasher to drain the base pan — this is not recommended, as it can cause the water to spread further into the machine’s electrical components. A technician should inspect and dry the base, then identify the source of the leak before the machine is run again.
E22: Blocked Filter
The E22 code indicates that water is left sitting in the sump because the fine filter is clogged and preventing proper drainage. This is the most user-serviceable error on the list. Bosch recommends cleaning the dishwasher filter at least once a month, and Australian hard water conditions — particularly common in Perth and Adelaide — can accelerate calcium and mineral buildup. According to the Australian Drinking Water Guidelines, water hardness varies significantly by region, which directly affects appliance maintenance needs.
To clear an E22 error:
- Remove the bottom rack and unscrew the cylindrical filter
- Rinse the filter under warm water and scrub away debris with a soft brush
- Check the flat mesh filter underneath for buildup
- Inspect the drain hose and non-return valve for blockages
- Run a short cycle and see if the code clears
If the filter is clean and E22 persists, the drain pump or non-return valve may need professional attention.
E23: Drain Pump Fault
Where E22 usually means a blocked filter, E23 points to a fault with the drain pump itself. This typically means the pump motor has failed or its electrical connection has become faulty. This is not a DIY repair — the pump needs to be tested with a multimeter and replaced if it has failed.
E24 / E25: Drainage Blockage
E24 and E25 both relate to drainage problems but are slightly further along the system than a simple filter blockage. E24 usually points to a kinked or blocked drain hose, while E25 often means the pump cover inside the machine is loose or that a foreign object — a broken piece of crockery, for example — is jamming the pump impeller. Check that the drain hose has no sharp bends and that the pump cover at the bottom of the tub is properly seated.
E09: Heating Element Failure
A Bosch dishwasher showing E09 has detected a fault with the heating element, which is responsible for heating water to the correct wash temperature. According to the CHOICE appliance testing methodology, inadequate water temperature is one of the leading causes of poor dishwasher cleaning performance. An E09 error means your dishes are likely coming out not fully sanitised. This is a component-level repair that requires a qualified technician.
When to Call a Professional
You should contact a qualified appliance technician if:
- The error code returns immediately after a reset
- You see E01, E09, or E23, which all relate to components that cannot safely be repaired without specialist tools
- There is visible water under or around the dishwasher (especially with E15)
- The machine is still under warranty and you don’t want to void it by opening panels yourself
FAQ
What does E15 mean on a Bosch dishwasher?
E15 means the AquaStop flood protection sensor has detected water in the base of the machine. The water supply is automatically shut off. A technician should identify and fix the source of the leak before the machine is used again.
Can I fix a Bosch dishwasher E22 error myself?
In most cases, yes. Remove and clean the filter under the bottom rack, check the drain hose for blockages, and run a short cycle. If the error returns after cleaning, a professional inspection is recommended.
Why does my Bosch dishwasher keep showing error codes?
Recurring error codes usually mean the underlying fault hasn’t been fully resolved. A reset clears the display but not the problem. A qualified technician can diagnose whether a sensor, pump, or component needs replacing.
How do I reset a Bosch dishwasher after an error code?
Turn the machine off at the power point, wait 30 seconds, then turn it back on. If the error returns, the fault is still present and needs to be addressed.
Are Bosch dishwasher repairs covered by warranty in Australia?
New Bosch appliances sold in Australia come with a manufacturer’s warranty. Under the Australian Consumer Law, all appliances must also be of acceptable quality and last a reasonable length of time, regardless of warranty status.
Conclusion
Understanding your Bosch dishwasher’s error codes takes the mystery out of breakdowns and helps you make smarter decisions about whether to attempt a fix or call in help. Codes like E22 are often straightforward to resolve, while others like E15 and E09 point to faults that genuinely need a trained eye. If you’re anywhere in Melbourne, Sydney, Brisbane, Perth, or Adelaide and your Bosch dishwasher is showing an error code that isn’t clearing, National Appliance Repairs can send a qualified technician to your door — often on the same day you call — with a 12-month warranty on all parts used in the repair.
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