Bosch Washer Error Codes List: Meanings, Causes, and How to Fix Them
If your Bosch washer stops during a cycle and shows an error code, the display is usually pointing you toward the general problem area. In many cases, that area is water supply, drainage, door locking, heating, leak protection, or sensing.
This guide brings the most common Bosch Washer Error Codes together in one place so you can understand what each one usually means and what to check first. Exact troubleshooting can vary by model, so your user manual still matters, but these codes usually stay in the same general problem families.
If you want broader site navigation, you can return to the Washer Code Guide homepage. If you are comparing similar lock or drain behavior in another brand, also see GE Washer LOCKED Message and GE Washer E2 Code.
Most Common Bosch Washer Error Codes
Here are some of the Bosch washer error codes users run into most often:
- E16 / F16 – door open or not locked properly
- E17 / F17 – water supply time exceeded
- E18 / F18 – drain problem or water not leaving properly
- E19 / F19 – heating-related issue on some models
- E20 / F20 – heating or control-side heating issue on some models
- E23 / F23 – leak protection or water in the base area
- E25 / F25 – turbidity or sensing issue on some models
- E26 / F26 – pressure-sensing issue on some models
- F27 – pressure switch or sensing-related issue on some models
- E28 / F28 – flow or sensor-related issue on some models
The exact wording can vary a little by region and model family, but the same code usually still points to the same general system.
What Bosch Washer Error Codes Usually Mean by Category
Door and lock codes
Codes in this group usually mean the washer cannot confirm a safe door-lock condition. The washer may refuse to start or stop before the cycle begins properly.
Water fill codes
These usually point to slow fill, low incoming pressure, closed taps, blocked inlet filters, or hose-side restrictions.
Drain codes
Drain-related codes usually mean the washer still detects water in the machine after the drain stage should have finished.
Heating codes
These usually suggest the machine is not heating as expected, is taking too long to heat, or is seeing a control-side heating issue.
Leak or base-water codes
These usually point to leak protection being triggered or water being detected where it should not be.
Sensor and pressure codes
These often point to water-level, pressure, turbidity, or flow-sensing issues that need more model-specific diagnosis.
Bosch Washer E16 / F16 Code
The E16 / F16 code usually means the washer door is open or not locked properly. The machine cannot confirm a safe door-lock condition, so it pauses the cycle or refuses to start.
- door not fully closed
- something trapped in the door opening
- an overloaded drum preventing correct closure
- latch or lock assembly trouble
Full guide: Bosch Washer E16 / F16 Code
Bosch Washer E17 / F17 Code
The E17 / F17 code usually means the washer is not getting water into the machine quickly enough.
- water tap not fully open
- low household water pressure
- blocked inlet screens
- inlet hose or AquaStop restriction
Full guide: Bosch Washer E17 / F17 Code
Bosch Washer E18 / F18 Code
The E18 / F18 code usually means the washer is not draining properly.
- blocked drain hose
- pump or pump-filter blockage
- drain hose routing problem
- weak drain pump
Full guide: Bosch Washer E18 / F18 Code
Bosch Washer E19 / F19 and E20 / F20 Codes
These Bosch washer codes are commonly associated with heating-related problems. Depending on the model, they may mean the machine is not heating correctly, is taking too long to heat, or is seeing a control-side heating issue.
Bosch Washer E23 / F23 Code
The E23 / F23 code is commonly associated with leak protection or water detected in the base area. This usually means the washer has detected moisture where it should not be and is protecting itself.
Bosch Washer E25 / F25, E26 / F26, F27, and E28 / F28 Codes
These codes are usually tied to measurement or sensing systems. Depending on the model, they may involve turbidity sensing, analog pressure sensing, pressure-switch behavior, or flow sensing.
What to Check First With Any Bosch Washer Error Code
- Make sure the door is fully closed
- Check that the water tap is fully open
- Inspect inlet and drain hoses for kinks or restrictions
- Look for standing water in the drum
- Reset the washer and test again
If the code points toward a fill problem, compare the symptoms with GE Washer H2O Code. If it points toward a drain problem, compare with GE Washer E2 Code.
How to Reset a Bosch Washer Error Code
- Turn the washer off
- Unplug it from power
- Wait about 5 minutes
- Plug it back in
- Run a short test cycle
A reset can clear a temporary interruption, but it will not permanently fix a repeated fill, drain, lock, heating, leak, or sensor problem.
When a Bosch Washer Error Code Is More Serious
A Bosch code becomes more serious when:
- the same code returns every cycle
- the washer will not fill, drain, heat, or lock correctly
- a reset does not help
- you suspect a leak-protection or sensor issue
Why Model Differences Matter
Bosch washer codes often stay in the same general problem family, but the exact part or repair path can vary by model. That is why the code tells you where to start, not always the exact failed component.
Bottom Line
Bosch Washer Error Codes help narrow down the problem area even when they do not identify the exact failed part immediately. The most common groups usually point to fill, drain, door, heating, leak, or sensor issues.
Start with the basics first: check the door, water supply, drain path, and a full reset. If the same code keeps returning, the washer may need deeper diagnosis or professional service.
FAQ
What is the most common Bosch washer error code?
E17 / F17 and E18 / F18 are among the most common because fill and drain problems happen more often than some deeper sensor faults.
Can I reset a Bosch washer error code?
Yes, sometimes a reset clears a temporary interruption, but the underlying cause still needs attention if the code comes back.
Are Bosch washer error codes always serious?
No. Many are tied to user-correctable issues like a shut water tap, blocked drain path, or incompletely closed door.
Does Bosch model variation matter?
Yes. Exact steps can vary by model family, so the manual for your specific washer still matters.
Should I go straight to service?
Not usually. It is usually better to check the basic fill, drain, and lock conditions first.