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Source-backed error-code guide

Reviewed

Bosch Dishwasher E27 Error Code

Bosch says E27 means the house power supply to the unit is too low. Bosch advises a breaker reset and, if the error occurs again, contacting an electrician to check incoming voltage.

Applies to Bosch dishwasher

What the appliance detected

Detected condition

The dishwasher reports that the house power supply to the unit is too low.

What may contribute

Possible causes

  • The household electrical supply may be too low.
  • A breaker or supply issue may be present.
  • Voltage verification requires a qualified electrician.

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

    • Record E27 before clearing it.
    • Reset power at the breaker for 30 seconds only if it can be done safely.
    • Do not perform live-voltage checks yourself.

  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

  • E27 occurs again after the documented breaker reset.
  • The breaker, outlet, wiring, or supply appears damaged or unreliable.
  • Incoming-voltage or appliance electrical 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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