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F18

F18 — Water drain time exceeded

Bosch · Washing Machines

What does F18 mean?

The washing machine failed to drain water within the specified time, similar to F03. This indicates an issue with the drain pump or drainage path.

Common Causes

  • Drain pump is defective or clogged
  • Drain hose is kinked or blocked
  • Pressure switch malfunction
  • Water level controller malfunction

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Clean the drain pump and its filter.

  2. 2

    Check the drain hose for kinks or blockages.

  3. 3

    Ensure the drain hose is positioned correctly according to the manual.

  4. 4

    Restart the machine after clearing potential obstructions.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

Related Faults

E02E02 — Motor problemE67E67 — Incorrect module encodingF01F01 — Door not closed or laundry obstructing door
Source: Bosch Washing Machines
Open Manual (Page 2)Search more codes in this manual