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Bosch washing machines use digital code diagnostics to alert users to issues that affect safety, performance or maintenance needs. These error codes, also known as Bosch error messages or diagnostic codes, appear on the machine’s display or through your Bosch washer’s blinking lights, depending on the model.
Some Bosch washers have full digital displays showing alphanumeric codes, while others use LED blink patterns or symbols to indicate faults. These codes help you quickly identify problems ranging from door lock issues to water supply faults for timely troubleshooting or repair.
Error codes typically appear when the machine detects a malfunction or safety risk during operation, such as a blocked drain or an unbalanced load.
For a broader troubleshooting overview, see our guide on How to Troubleshoot Common Bosch Washing Machine Problems.
Bosch Washing Machine Error Code List and Meanings
Below is a comprehensive table of Bosch washing machine error codes, their meanings and likely causes. This serves as your central reference for diagnosing faults:
Your complete Bosch washing machine error code list:
| Code | Description | Likely Cause |
| E16 / F16 | Door not closed | Door not shut properly or faulty door lock |
| E17 / F17 | Water fill issue | Water tap closed, low pressure, inlet valve blocked |
| E18 / F18 | Not draining | Blocked filter, kinked hose, faulty drain pump |
| E19 / F19 | Heating time too long | Faulty heating element or temperature sensor |
| E20 / F20 | Unexpected heating | Control board fault |
| E21 / F21 | Motor error | Blocked drum, worn carbon brushes or motor fault |
| E22 | Aquastop activated | Leak or water in base tray |
| E23 / F23 | Leak sensor triggered | Machine is leaking or flooded |
| E24 | Pump failure | Damaged or obstructed drain pump |
| E25 | Drain pump blocked | Debris stuck in impeller or pipe |
| E26 | Pressure sensor fault | Sensor not detecting water level correctly |
| E27 | Bosch washer door lock error or sensor fault | Faulty sensor or latch mechanism |
| E28 | Flow sensor error | Incorrect water flow detection |
| E29 | Water pressure too low | Closed tap, restricted inlet valve |
| E30 | Heating sensor issue | NTC sensor defective |
| E32 | Load imbalance | Uneven distribution or overloaded drum |
| E36 | AquaStop failure | Fault with AquaStop hose or internal leak |
| E37 | Overfilling detected | Faulty pressure switch or valve stuck open |
| E38 | Blocked pressure chamber | Needs manual cleaning |
| E42 / E43 | Door unlocking issue | Mechanism jammed or control board fault |
| E44 | Door opening detected during cycle | Safety override triggered |
| E45 | Communication error | Control module fault |
| E47 / E48 | Door lock electronics failure | Hardware issue with lock circuit |
| E50 / F50 | Motor fault | Tachogenerator or motor driver error |
| F43 | Drum not turning | Motor jammed, worn brushes, or faulty motor |
| E60 – E69 | Heating circuit fault range | Depends on model; often related to temperature sensors, heating element |
| E90 – E92 | Software or board error | Internal PCB communication fault |
| CL / CHILD | Child lock activated | Not an error, just a lock indicator. To deactivate the child lock, press and hold the start button for five seconds. |
| NO | Water not entering | Similar to E17; used on some basic models |
| END flashing | Programme ended or drain issue | Check if drain cycle completed |
Interpreting Error Codes on Models Without a Display
Some Bosch washing machines do not have a digital display but instead use LED lights that blink in specific patterns to indicate faults. Each blink count or combination corresponds to a particular error code.
For example, a certain number of flashes might indicate a door lock problem or a drainage issue. To interpret these LED blink codes, consult your machine’s user manual, which provides model-specific guidance on what each pattern means.
If no code appears but the machine fails to operate normally, it may indicate a more complex fault requiring professional diagnosis or a reset attempt.
How to Reset a Bosch Washing Machine Error Code
Resetting your Bosch washing machine can sometimes clear error codes and restore normal operation, especially for transient faults. Common reset methods include:
- Power cycle method: Turn off the machine, unplug it from the power source, wait 1-2 minutes and then plug it back in and turn it on.
- Button reset: On some models, holding the Start/Reload button for three to five seconds will reset the machine.
However, resetting is not a permanent fix if the underlying problem persists. Some errors like load imbalance (E32) or door not closed (F16) often clear on reset once the issue is resolved. But faults related to motor failure or leaks usually require repair and will reoccur if ignored.
Which Error Codes Require Professional Repairs?
Certain Bosch error codes indicate serious faults that usually need expert attention:
- E23 / F23 (Leak sensor triggered): Indicates water leakage or flooding inside the machine.
- F43 (Drum not turning): Suggests motor jam, worn brushes or motor failure.
- E36 (AquaStop failure): Points to a fault in the AquaStop hose or internal leak.
- E90 – E92 (Software or board error): Internal control board or PCB communication faults.
DIY fixes for these errors may be ineffective or risky due to electrical or mechanical complexity. Continuing to use the machine with these faults can cause further damage or safety hazards.
Signs it’s time to stop using your Bosch washing machine include persistent leaks, unusual noises, or failure to start despite resets.
Need a qualified Bosch engineer? Book a repair with Domex, offering a fast service across London and the South East.
What Causes Bosch Error Codes to Keep Reappearing?
Recurring Bosch error codes often stem from:
- Incorrect troubleshooting: Temporary fixes that don’t address root causes.
- Underlying component damage: Worn parts like pumps, motors or sensors.
- Water pressure fluctuations: Low or inconsistent water supply triggering fill errors.
- Software issues or firmware updates: Bugs or outdated control software affecting operation.
Persistent errors require thorough diagnosis and sometimes professional servicing to prevent repeat faults.
Preventing Error Codes in the Future
To minimise Bosch washing machine error codes, follow these steps to help maintain optimal performance and extend your washer’s lifespan:
- Run diagnostic or self-test cycles periodically to detect issues early.
- Avoid interrupting wash cycles mid-programme as this can cause errors.
- Apply firmware updates if your model supports them to fix software bugs.
- Schedule regular professional maintenance to clean filters, check hoses and inspect electrical components.
- Use the machine according to manufacturer guidelines to reduce wear and tear.
Still Stuck? Domex Can Help
Understanding Bosch fault codes is essential for timely troubleshooting and maintaining your washer’s performance. Whether your machine displays clear digital codes or uses LED blink signals, recognising what each error means helps you decide when a simple reset suffices or when professional repair is necessary.
Regular maintenance, careful use and prompt attention to Bosch appliance error codes can prevent recurring issues and extend your washer’s lifespan. Remember, some errors-especially those involving leaks, motor faults or control board failures-require expert intervention to avoid further damage.
For reliable and fast error code diagnostics for Bosch or washing machine repair services, contact the team at Domex, which offers skilled support across London and the South East. Stay informed, proactive and keep your Bosch washer running smoothly for years to come.
Bosch Washer Error Code FAQs
Q: Are Bosch washing machine error codes universal?
A: Many codes are shared across models, but some vary depending on the series (e.g., Series 4 vs Series 8) and whether the machine has a display or uses LED blink codes.
Q: Can I ignore a Bosch error code if the machine still runs?
A: No. Ignoring error codes can lead to further damage or safety risks. Always identify and address the issue promptly.
Q: How do I find out what Bosch model I have?
A: Check the silver rating plate located inside the door or on the side panel of your washing machine. It contains the model number and serial details.
Q: Is it worth repairing a Bosch washer after repeated errors?
A: In most cases, yes. Bosch machines are built for durability, and with proper repair and maintenance-such as through the Domex Repair & Care Plan-you can extend their useful life significantly.
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