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Bosch Washing Machine Error Code E18

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ High Severity 🔧🔧 Moderate DIY Also shown as: F18

Drain time exceeded — water not draining within expected time

The most common cause of the E18 error on a Bosch washing machine is clogged drain pump filter (~50% of cases); start with: clean the drain pump filter.

💰 DIY cost: $0–$100 👨‍🔧 Pro cost: $150–$280 Save $150+ by doing it yourself
Bosch Washing Machine error code E18 on the display panel
How the E18 code appears on a Bosch washing machine display

What Does Error Code E18 Mean on a Bosch Washing Machine?

Drain time exceeded — water not draining within expected time.

The control board monitors the drain phase and expects the water level in the drum to drop within a set time window. If the pressure sensor still detects water after the drain pump has run, E18 (also shown as F18) fires and the cycle pauses with water remaining. Unlike E21, which flags a pump that is drawing abnormal current or is jammed, E18 simply means drainage was too slow — most often from a restricted flow path rather than an electrical pump fault.

Models affected: Bosch front-load washers that use the E18/F18 code convention, including models such as WAT28400UC and WGA12400UC
What owners report: Owners commonly report E18 appearing at the end of a wash with standing water in the drum, and clearing the drain pump filter behind the lower-front flap resolves it in many cases. A partially kinked drain hose or a slow household standpipe can trigger it intermittently, so it may seem to come and go before a full blockage develops.

What Causes Error Code E18?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Clogged drain pump filter 50% of cases
  2. 2
    Kinked or blocked drain hose 25% of cases
  3. 3
    Blocked household standpipe 15% of cases
  4. 4
    Drain pump motor failure 10% of cases

How to Fix Bosch Washing Machine Error Code E18

🔧🔧 Moderate DIY Est. time: 30–60 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Clean the drain pump filter

    The filter is behind the lower-front service flap. Turn cap slowly to drain water, remove and clean filter.

    ⚠️ Have towels ready — significant water will drain.
  2. 2

    Check drain hose

    Inspect hose for kinks from back of machine to standpipe.

  3. 3

    Check standpipe

    Pour water directly into standpipe. If it backs up, clear the household drain.

  4. 4

    Test drain pump

    If filter is clear and hose is good, pump motor may have failed.

    🔩 Bosch drain pump ($50–$100)

How to Reset Error Code E18

After clearing blockage, press the pause/cancel button to reset, then restart cycle.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full Bosch washer reset guide → Enter diagnostic mode → Symptom guide: Washer won't drain →

Did this guide fix your appliance?

When to Call a Professional

If drain pump is replaced and E18 persists, control board drain relay needs testing.

Average professional repair cost for this issue: $150–$280

Related Error Codes

F21
Motor fault — drum not spinning or motor running abnormally
⚠ High Severity
F03
Drain timeout — water did not drain within the expected time
⚠ High Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your Bosch Washing Machine:

🔩
Search PartSelect
Bosch Washing Machine repair parts
🔧
Search RepairClinic
Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More Bosch Washing Machine Error Codes

E02 Door lock failure — cannot lock door for cycle E17 Water intake fault — fill time exceeded E04 Anti-flood device activated — water detected in base F01 Water intake timeout — machine failed to fill within the expected time F02 Heating timeout — water did not reach the target temperature F04 Motor fault — drive motor not running correctly

Frequently Asked Questions

Can I keep using my Bosch Washing Machine when error E18 appears? +
It is not advisable. The washing machine may still power on, but running it while E18 is active can worsen the drainage fault or damage related parts. Treat it as a soon-as-possible repair.
What most commonly causes E18 on a Bosch Washing Machine? +
Across reported Bosch washing machine repairs, the most frequent is clogged drain pump filter (50% of cases), kinked or blocked drain hose (25%), then blocked household standpipe (15%). Check them in that order before replacing any parts.
E18 keeps coming back after a reset — what should I check next? +
A reset only clears the stored E18 fault; if it returns, the drainage problem is still present. Move on to the physical checks — clean the drain pump filter, then check drain hose — since the code will reappear until the root cause is resolved. This is a moderate job — a multimeter and some disassembly are usually involved.
How much does it cost to fix Bosch Washing Machine error E18? +
A DIY repair typically runs $0–$100 in parts, versus $150–$280 for a professional service call, so handling it yourself saves around $150. Expect the work to take roughly 30–60 minutes.
Which Bosch Washing Machine models show error E18? +
E18 is documented on Bosch front-load washers that use the E18/F18 code convention, including models such as WAT28400UC and WGA12400UC. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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