Step-by-Step DIY Fix Guide
- Pause the cycle and follow the Bosch manual for any approved user-accessible draining steps.
- Inspect visible drain hose routing to make sure it is not kinked or crushed.
- Clean the user-accessible filter only if your manual specifically describes the process.
- Restart the machine only after the manual confirms the area is safe and dry.
If it's still not draining
- If the drain path looks clear but the code returns, the issue is more likely in the pump path or another less accessible restriction.
- If the door closes normally but the warning keeps returning, the latch or switch path becomes more likely than a simple alignment issue.
- If airflow still seems weak after the basic checks, the fan path or a deeper obstruction becomes more likely.
What This Error Means
E18 on your Bosch washing machine means: The washing machine cannot drain water because the drainage hose is blocked, kinked, or incorrectly positioned. The machine detects this condition via its sensors and stops the current cycle to prevent further damage. The error will remain until the underlying cause is resolved.
The most frequent cause is drainage hose kinked or crushed behind the machine. Work through the causes listed below in order — the first cause is the most likely and the most straightforward to check.
Error E18 is DIY-safe for most homeowners. The fix typically takes under 30 minutes and requires no specialist tools. Follow the steps below exactly — skipping steps is the most common reason the error returns.
The most visible symptom is standing water in the drum at the end of a cycle. Do not run another cycle until the blockage is cleared — standing water stresses the door seal and pump motor.
Most Likely Cause by Symptom
The Bosch washing machine may stop, pause, or refuse to complete the cycle normally.
Likely cause: Drainage hose kinked or crushed behind the machine
Check first: SAFETY: Switch program to OFF. Unplug the machine.
Water may remain inside the drum at the end of the cycle.
Likely cause: Blocked sink drain or standpipe connection
Check first: Caution: drain water may be hot — allow time to cool before working.
The appliance may fail to start because the door or lock state cannot be confirmed.
Likely cause: Lint or debris accumulated inside the drain hose
Check first: Pull the machine forward and inspect the drain hose at the back for kinks — straighten any found.
Common Causes
- A pump filter or accessible drain area may be obstructed.
- The drain hose may be kinked, trapped, or positioned incorrectly.
- A household drain or standpipe may be slowing water flow.
What Not to Do
- Do not position the drain hose end higher than 39 inches — creates a siphon that triggers false drain errors
- Caution: draining water may be very hot — risk of scalding
Model and Display Variation Notes
Model-family notes
- Bosch washing machine display wording and code formats can vary by series.
- If your model behaves differently, check the owner manual before trying any deeper maintenance step.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Drain hose ($15–$35)
- Pump filter cap if cracked ($10–$20)
Manual and model check
Check your exact model and manual before ordering any Bosch washing machine parts.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
Water remains trapped after manual-approved checks.
- The machine repeatedly shows E18 or stops during draining.
- You hear unusual pump noise or cannot access the filter safely.
How to Prevent It Recurring
- Check drain hose routing when moving the machine — kinks are the most common cause
- Clean the pump filter every 3 months
Extra notes
- Drain-time faults can be caused by appliance setup as well as internal faults.
- Do not force open covers or remove internal panels.
Source and model notes
Last reviewed: 2026-04-07
Based on: Based on Bosch support material and edited into consumer-safe guidance for the exact code family on this page.
Model coverage note: Bosch washing machine code meanings can vary by series, control panel, and model family, so use this page as a safe starting point rather than a replacement for the model-specific manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Use only manual-approved maintenance steps. If the machine will not clear the water or the warning returns, contact Bosch support or a qualified technician.