Bosch Washing Machine E18/F18 error code

The washer cannot drain within the expected time, usually because the pump or the drain path is blocked. You may see water standing in the drum or a cycle that stops before finishing.

Also shown as: E18, F18

Last updated: September 30, 2026

Quick answer: Bosch washing machine error code E18/F18: drainage problem: pump blocked or hose kinked. The most common cause is drain pump clogged with lint, coins, or small items. Try this first — inspect the drain hose. If that does not clear it, clean the pump.

What causes the E18/F18 error?

  • Drain pump clogged with lint, coins, or small items
  • Drainage hose kinked, blocked, or installed incorrectly
  • Siphon connection or filter in the water supply hose blocked

How to fix Bosch E18/F18 — step by step

Work through these in order, from simplest and safest first. Stop as soon as the code clears.

  1. Inspect the drain hose
    Turn the program off and unplug the machine. Check that the drainage hose has no kinks, loosen the hose clip on the siphon, remove the hose and residual water, and clean the hose and siphon spigot before reconnecting.
    Safety warning: Leaking water can be very hot and cause scalding; always set the program to OFF and pull the plug first.
  2. Clean the pump
    Open the service flap, drain remaining water by slowly removing the pump cover, then clean the interior, pump cover thread, and pump housing. Make sure the impeller wheel turns freely, then refit the cover firmly.
    Safety warning: Stand back and have towels ready; the water inside may be very hot.
  3. Leak-test and drain
    Pour about a quart (1 liter) of water into the detergent dispenser, check for leaks, then run the DRAIN program to confirm the machine empties fully.

When to call a technician

Stop and call a qualified technician if any of these apply:
  • Water still will not drain after the hose and pump are clean
  • The pump impeller is jammed or the pump makes no sound at all
  • The code keeps returning every wash

Frequently asked questions

Can I open the door when E18 shows?

Drain the water first through the pump service flap; the door may stay locked while the machine detects water inside.

What is the difference between E18 on a washer and a dishwasher?

On a Bosch washer, E18 means the drain pump or hose is blocked; on a Bosch dishwasher, E18 is a water-flow issue with low water level. The fix for the washer focuses on the drain pump and hose.

FixCode provides general troubleshooting information only — not professional repair advice. If you are unsure about any step, stop and call a qualified technician. Repairs done incorrectly can be dangerous and may void your warranty.

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