Bosch Washing Machine Error Codes Explained
What They Mean, Handy Solutions & When to Call for Repairs
There’s never a good time for your washing machine to stop working — especially when it flashes a confusing error code you’ve never seen before.
Whether your Bosch washing machine won’t drain, won’t spin, won’t fill with water, or suddenly stops mid-cycle, understanding the error code can often help you solve the issue quickly.
At Tommie Kelly Electrical, we help customers every day with appliance troubleshooting, repairs, and replacement advice. This guide explains the most common Bosch washing machine error codes, what they mean, and handy solutions you can safely try at home before arranging a repair.
Why Bosch Washing Machines Display Error Codes
Modern Bosch washing machines are built with intelligent diagnostic systems that monitor the appliance while it runs.
When something isn’t working correctly, the machine displays an error code — usually beginning with “E” or “F” — to help identify the problem.
These warning codes can relate to:
- Drainage problems
- Water supply issues
- Door lock faults
- Heating problems
- Sensor malfunctions
- Leak detection systems
- Electrical or communication faults
In many cases, the issue is minor and can be fixed with a simple reset or cleaning routine.
First Try This — Reset Your Washing Machine
Before worrying about expensive repairs, always try a basic appliance reset first.
Quick Bosch Washing Machine Reset
- Turn the washing machine off completely
- Unplug it from the mains
- Wait for 5 minutes
- Plug it back in
- Restart a short wash or rinse cycle
Many temporary electronic faults disappear after a full power reset.
Bosch Error Code E16 / F16
Door Not Closed Properly
One of the most common Bosch washing machine errors.
What It Means
The machine believes the door is still open or not locked securely.
Common Causes
- Clothes trapped in the door
- Overloaded drum
- Faulty door lock
- Damaged rubber seal
Handy Solutions
✔ Open and firmly close the door again
✔ Remove trapped clothing from the seal area
✔ Reduce the load size
✔ Restart the washing programme
✔ Check the rubber seal for debris
If the error remains, the door locking mechanism may need professional replacement.
Bosch Error Code E17 / F17
Water Supply Problem
What It Means
The washing machine is not filling with water correctly or quickly enough.
Common Causes
- Water tap turned off
- Low water pressure
- Kinked inlet hose
- Blocked inlet filter
Handy Solutions
✔ Make sure the water tap is fully open
✔ Inspect hoses for bends or crushing
✔ Clean the water inlet filter mesh
✔ Check water pressure around the home
✔ Ensure hoses are not trapped behind the machine
Low water pressure is one of the most common causes of this error.
Bosch Error Code E18 / F18
Washing Machine Not Draining
This is one of the most searched Bosch washing machine faults.
What It Means
The appliance cannot drain water correctly.
Common Causes
- Blocked pump filter
- Kinked drain hose
- Debris trapped in the pump
- Drain pump fault
Handy Solutions
✔ Clean the pump filter thoroughly
✔ Check the drain hose for blockages
✔ Look for trapped socks or lint
✔ Ensure the hose is not bent behind the appliance
✔ Run a separate drain cycle
Small objects like coins, buttons, and baby socks are surprisingly common causes of drainage faults.
If the problem continues, the drain pump itself may require repair.
Bosch Error Code E19 / F19
Heating Problem
What It Means
The appliance is taking too long to heat water.
Common Causes
- Limescale build-up
- Heating element problems
- Temperature sensor faults
- Electrical issues
Handy Solutions
✔ Run a maintenance wash with descaler
✔ Use anti-limescale cleaner regularly
✔ Avoid using too much detergent
✔ Restart the appliance after cleaning
Hard water can gradually reduce heating performance over time.
Bosch Error Code E20 / F20
Unexpected Heating Fault
What It Means
The machine has detected abnormal heating behaviour.
Handy Solutions
✔ Switch the appliance off immediately
✔ Run a full power reset
✔ Avoid using very hot cycles temporarily
✔ Descale the appliance
✔ Arrange professional inspection if the code returns
This issue can sometimes indicate a failing heating element.
Bosch Error Code E23 / F23
AquaStop Leak Protection Activated
What It Means
The anti-flood protection system has detected water leakage inside the appliance.
Warning Signs
- Water underneath the machine
- Appliance stopping suddenly
- Pump running continuously
- Water intake stopping automatically
Handy Solutions
✔ Turn off the water supply immediately
✔ Disconnect power safely
✔ Check hoses for visible leaks
✔ Avoid using the appliance until inspected
⚠️ Water and electricity can be dangerous together, so this issue should normally be handled by a professional repair technician.
Bosch Error Code E25 / F25
Water Sensor Issue
What It Means
The water cleanliness sensor may not be working properly.
Handy Solutions
✔ Run a drum cleaning cycle
✔ Clean filters thoroughly
✔ Avoid excessive detergent usage
✔ Restart the appliance after cleaning
If the fault keeps returning, the sensor may require replacement.
Bosch Error Code E26 / F26
Pressure Sensor Fault
What It Means
The machine is struggling to measure water levels correctly.
Handy Solutions
✔ Perform a full appliance reset
✔ Check for drainage blockages first
✔ Avoid overloading the machine
✔ Contact repair support if recurring
Bosch Error Code E28 / F28
Water Flow Sensor Problem
What It Means
The washing machine cannot correctly detect incoming water flow.
Handy Solutions
✔ Inspect the water supply
✔ Clean inlet filters
✔ Check hoses for restrictions
✔ Ensure water pressure is normal
✔ Restart the machine after cleaning
Other Common Bosch Washing Machine Problems
Sometimes the appliance may develop faults without displaying an error code.
Common Symptoms Include
- Washing machine not spinning
- Excessive vibration
- Loud noises during cycles
- Bad odours from the drum
- Water leaks
- Cycles taking too long
- Detergent drawer build-up
Many of these issues can be improved with regular maintenance and cleaning.
Handy Maintenance Tips to Prevent Error Codes
A little preventative maintenance can help avoid many common Bosch washing machine faults.
Easy Ways to Keep Your Washing Machine Running Smoothly
Clean the Pump Filter Monthly
Removing trapped lint and debris helps prevent drainage problems.
Avoid Overloading the Drum
Heavy loads place strain on motors, bearings, and suspension systems.
Use the Correct Amount of Detergent
Too much detergent can cause sensor errors and excessive foam.
Leave the Door Open After Washes
This helps reduce moisture, mould, and unpleasant smells.
Run a Hot Maintenance Wash
Running an occasional hot cycle helps clean internal components.
Descale the Appliance Regularly
Especially important in hard water areas.
When Should You Call a Repair Technician?
While many error codes have simple solutions, some faults require professional attention.
Arrange Repairs If:
- Error codes keep returning repeatedly
- The machine trips the electrics
- Burning smells appear
- Water leaks continue
- The drum stops spinning completely
- Loud grinding noises develop
- The appliance loses power unexpectedly
Ignoring these warning signs can sometimes lead to more serious and expensive repairs.
Tommie Kelly Appliance Repair Service
At Tommie Kelly Electrical, we provide trusted appliance repair services for homes across Ireland.
Our experienced repair team can help diagnose and repair many common Bosch washing machine problems quickly and professionally.
We Repair
- Washing machines
- Dishwashers
- Ovens & cookers
- Fridge freezers
- Tumble dryers
- Built-in kitchen appliances
Why Customers Choose Tommie Kelly
✔ Experienced appliance repair technicians
✔ Friendly and reliable local service
✔ Fast diagnostics and support
✔ Honest advice you can trust
✔ Help with replacement appliances if needed
✔ Trusted customer care from a long-established Irish retailer
👉 Visit our Appliance Repair Service page:
https://tommiekelly.ie/appliance-repairs/
Final Thoughts
Bosch washing machines are designed to be reliable, energy-efficient, and intelligent — but even premium appliances can occasionally develop faults.
The good news is that many common Bosch error codes are linked to simple issues like blocked filters, drainage problems, or water supply interruptions.
Understanding what these codes mean can help you solve smaller issues quickly, reduce stress, and avoid unnecessary repair costs.
And if the issue goes beyond a simple fix, Tommie Kelly Electrical is always here to help with trusted appliance repairs, expert advice, and dependable customer support.