How to Fix Bosch Washing Machine E18 Error
Last updated: 7 September 2026
Clean the drain filter, check the drain hose, and clear the pump.
Overview
Bosch washing machine E18 error indicates a drain blockage. This guide covers diagnosing and fixing the E18 error.
Step-by-Step Fix
Before beginning any repair, ensure you have isolated power or water supplies. Clear your workspace, gather standard hand tools, and wear appropriate personal protective equipment (PPE).
- First, turn off the washing machine and unplug it from the mains power supply. Place a shallow basin or towel under the drain filter area to catch any water that may spill during the repair.
- Locate the drain filter at the bottom front of the washing machine. This is usually behind a small flap or panel. Open the flap and remove the filter cover.
- Remove the drain filter by turning it anti-clockwise. Allow any water to drain into the basin. Clean the filter thoroughly under running water, removing any debris, lint, or coins that may have accumulated.
- Check the drain hose for any blockages or kinks. The drain hose is usually located at the back of the washing machine. Disconnect the hose and check for any obstructions. If the hose is kinked, straighten it out.
- Clear any debris from the drain pump. The drain pump is usually located at the bottom of the washing machine, behind the drain filter. Use a torch to inspect the pump and remove any visible debris.
- After cleaning the filter and checking the drain hose, reassemble the washing machine. Ensure the filter is securely in place and the drain hose is reconnected correctly.
- Plug the washing machine back into the mains power and turn it on. Run a short cycle to test the machine and confirm that the E18 error has cleared.
- If the E18 error persists after cleaning the filter and checking the drain hose, there may be a fault with the drain pump. This will need to be replaced by a qualified appliance technician.
Common Error Codes
Review the common error codes and operating symptoms below to quickly identify the root cause of the fault before ordering replacement parts.
| Symptom / Code | Likely Root Cause | Recommended Resolution |
|---|---|---|
| E18 | Drain blockage | Clean the drain filter, check the drain hose for blockages, and clear the pump. If the error persists, the drain pump may be faulty and need replacing. |
| E17 | Drain blockage | Clean the drain filter and check the drain hose. This is the same type of error as E18, often triggered by the same issues. |
| E23 | Water intake fault | Check the water supply and the inlet valve. If the valve is faulty, it will need to be replaced. |
| E40 | Door lock fault | Check the door lock mechanism. If the door is not latching correctly, the machine will not start. |
Frequently Asked Questions
What does Bosch E18 error mean on a washing machine?
Bosch E18 error indicates a drain blockage. This means the washing machine is unable to drain water properly, which can be caused by a blocked filter, a kinked drain hose, or a faulty drain pump.
How do I reset Bosch washing machine E18 error?
After cleaning the filter and checking the drain hose, turn off the washing machine at the mains for a few minutes, then turn it back on. The E18 error should clear. If it does not, there may still be an issue with the drain system.
What causes Bosch E18 error?
Bosch E18 error is caused by a drain blockage. This can be due to a blocked filter, a kinked or blocked drain hose, or a faulty drain pump. It can also be caused by using the wrong type of detergent or overloading the machine.
Can I fix Bosch E18 error myself?
Yes, you can clean the drain filter and check the drain hose for blockages. If the error persists after these checks, the drain pump may be faulty and will need to be replaced by a qualified appliance technician.