ERROR CODE EXPLAINED
Bosch Washer
Bosch Washer F18 Error Code
What it means
Bosch says F18 indicates a drain problem, such as a blocked or kinked drain hose or blocked drain pump.
Try this first
- Switch the washer off and unplug it before working on the drain system.
- Allow hot wash water to cool before draining because there is a scalding risk.
- Check the drain hose and siphon for a blockage or kink and clear them.
- Clean the drain pump using the Bosch procedure, then reassemble it and check for leaks.
- Run a drain test after reassembly.
Can I keep using it?⚠ Bosch says F18 indicates a drain problem, such as a blocked or kinked drain hose or blocked drain pump.
Repair usually required?⚠ Follow only the manufacturer-backed checks listed on this page before replacing parts.
If the error keeps returning
Use the linked official manufacturer support source for additional model-specific guidance.
Official source
Troubleshooting information verified against manufacturer support documentation.
View manufacturer support page →Safety note:ApplianceSignal provides general troubleshooting information. Always follow the appliance manufacturer's safety instructions and disconnect power when required.