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Source-backed error-code guide

Reviewed

Bosch Washer E18 / F18 Error Code

Bosch says E18 can occur when the washer detects a blockage in the pump or a blocked or kinked hose. Bosch warns that draining water may be very hot and can scald.

Applies to Bosch washer

What the appliance detected

Detected condition

The washer reports a blocked or kinked drain path, or a blocked pump condition.

What may contribute

Possible causes

  • The drain hose may be kinked or blocked.
  • The drain pipe or siphon connection may be restricted.
  • The pump area may be blocked and may require model-specific maintenance.

Start conservatively

Safe preliminary checks

Work in order and stop whenever a step is not supported by the documentation for your model.

  1. Record the Bosch washer display

    • Photograph or write down the exact code or symbol before clearing it.
    • Confirm the full model number and owner manual because Bosch washer codes can vary by platform and model.

  2. Use only documented homeowner checks

    • Turn the program off and unplug the washer before any documented drain work.
    • Check that the visible drain hose is not kinked.
    • Follow only the model manual for drain-hose, siphon, or pump-maintenance steps, and treat hot residual water as a scald risk.

  3. Stop before internal washer work

    • If the code remains or returns after the documented checks, request Bosch support or qualified service.
    • Do not open electrical areas, bypass locks, test live components, or disassemble pumps, motors, controls, or AquaStop parts beyond the model manual.

Actions not recommended

  • Do not test live voltage or access internal wiring.
  • Do not bypass door locks, water-protection devices, or safety switches.
  • Do not treat the code as proof that one specific internal component failed.

When to stop and request service

  • The washer still will not drain after manual-supported external checks.
  • Water cannot be drained safely, or leaks appear after reconnecting hoses.
  • Pump, motor, wiring, or internal diagnosis would be needed.

Documented source

Official information reviewed

Our summary is based on manufacturer support material and stays within the limits of that material.

Source reviewed by Appliance Help HQ: August 18, 2026.

Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by Bosch.

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