Bosch · Washing Machine · Drainage Problem

Bosch Washing Machine Error F18

Bosch washing machine error F18 usually indicates a drainage fault. ECL records this code as “Drain Pump Timeout”. Common causes on this page include Blocked filter and Restricted drain hose, but the exact cause can vary by model and appliance generation. Start with the safe external checks below, confirm model-specific guidance using your exact model number, and arrange repair help if the code returns or any safety warning applies.

Quick answer: Drain Pump Timeout

In simple terms

Bosch washing machine code F18 usually means Drain Pump Timeout. Follow these four steps.

1Understand the code

See what the code usually means and why it may have appeared.

2Try safe checks

Try only the simple checks listed on this page. Do not take the appliance apart.

3Check if it is safe to use

Check the safety section before you keep using the appliance.

4Choose the next step

Use the next-step box to see whether to keep checking, find a part by model or get repair help.

What Bosch F18 means

The appliance has taken too long to drain water.

Common causes

  • Blocked filter
  • Restricted drain hose
  • Pump fault

Safe checks you can make

  1. Clean the pump filter
  2. Check the drain hose height and route

Repair help

Try the safe checks first

Start with the simple checks on this page. If the code comes back, stop guessing and get repair help.

Still showing? Get repair help Check parts using your model number

Before buying a part: confirm the full model number and check the seller's part number. A fault code alone is not enough.

No obligation. Your contact details are only shared after you submit the repair request, and only with a suitable ECL Verified repairer where coverage is available.

When to stop and call an engineer

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

Your model may be different

Error-code meanings can vary by model, market and appliance generation. Confirm Bosch F18 against the instruction manual or support information for the exact model number before replacing parts or treating this page as a model-specific diagnosis.

Where this information comes from

Publisher: Error Code Lookup Editorial Team. This page is independent information written in our own words and reviewed with safety boundaries in mind.

Manufacturer information: Bosch UK User Manuals. Use the exact model number to verify model-specific wording and instructions.

Last reviewed: 2026-05-18

How Error Code Lookup researches and verifies pages · Report a correction or provide model-specific evidence

Frequently asked questions

What does F18 mean on a Bosch washing machine?

The appliance has taken too long to drain water.

What usually causes Bosch error F18?

Common causes include Blocked filter; Restricted drain hose; Pump fault.

Can I safely fix F18 myself?

Some basic external checks may be safe to try first. Stop if there are leaks, burning smells, overheating, electrical issues, unusual noises or repeated failures.

When should I call a professional for F18?

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

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