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Source-backed error-code guide

Reviewed

Bosch Dishwasher E18 Error Code

Bosch says E18 indicates an issue with water flow into the dishwasher; the water level may be too low or water may not be pumped correctly.

Applies to Bosch dishwasher

What the appliance detected

Detected condition

The dishwasher reports a water-flow issue or water level that is too low.

What may contribute

Possible causes

  • The inlet hose may be kinked or damaged.
  • The water supply may not be turned on.
  • Water flow may be insufficient for the dishwasher.

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 dishwasher display

    • Photograph or write down the exact code or flashing-light pattern before clearing it.
    • Confirm the full model number and owner manual because Bosch dishwasher codes vary by series and control platform.

  2. Use only documented homeowner checks

    • Check the inlet hose for kinks or damage.
    • Make sure the water supply is turned on if the shutoff is safely accessible.
    • Use Bosch’s documented flow-rate guidance with caution and contact Bosch support if the supply check is not straightforward.

  3. Stop before internal dishwasher work

    • If the code remains or returns after documented checks, request Bosch support or qualified service.
    • Do not test live components, access control boards, bypass leak protection, or disassemble pumps or heaters beyond model-manual maintenance.

Actions not recommended

  • Do not reach into wet areas while the dishwasher has power.
  • Do not test live voltage or open internal electrical areas.
  • Do not treat an error code as proof that one specific internal component failed.

When to stop and request service

  • E18 remains after hose and supply checks.
  • Water supply, flow rate, or plumbing cannot be confirmed safely.
  • Internal fill, pump, or control 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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