Bosch · Dishwasher · Motor Fault

Bosch Dishwasher Error E04

Bosch dishwasher error E04 usually indicates a motor or drive-system fault. ECL records this code as “Water Switch Fault”. Common causes on this page include Diverter valve fault and Blocked water path, but the exact cause can vary by model and appliance generation. Start with the safe external checks below, confirm model-specific guidance using your exact model number, and arrange repair help if the code returns or any safety warning applies.

Quick answer: Water Switch Fault

In simple terms

Bosch dishwasher code E04 usually means Water Switch Fault. Follow these four steps.

1Understand the code

See what the code usually means and why it may have appeared.

2Try safe checks

Try only the simple checks listed on this page. Do not take the appliance apart.

3Check if it is safe to use

Check the safety section before you keep using the appliance.

4Choose the next step

Use the next-step box to see whether to keep checking, find a part by model or get repair help.

What Bosch E04 means

The dishwasher water switching system has not changed position correctly.

Common causes

  • Diverter valve fault
  • Blocked water path
  • Motor issue

Safe checks you can make

  1. Clean filters and spray arms

When to stop and call an engineer

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

Your model may be different

Error-code meanings can vary by model, market and appliance generation. Confirm Bosch E04 against the instruction manual or support information for the exact model number before replacing parts or treating this page as a model-specific diagnosis.

Where this information comes from

Publisher: Error Code Lookup Editorial Team. This page is independent information written in our own words and reviewed with safety boundaries in mind.

Manufacturer information: Bosch UK User Manuals. Use the exact model number to verify model-specific wording and instructions.

Last reviewed: 2026-05-18

How Error Code Lookup researches and verifies pages · Report a correction or provide model-specific evidence

What to do next

Use the information above before spending money

Check the appliance manual and the sources above. If the symptoms change or the fault comes back, check the code again before buying parts or arranging a repair.

Frequently asked questions

What does E04 mean on a Bosch dishwasher?

The dishwasher water switching system has not changed position correctly.

What usually causes Bosch error E04?

Common causes include Diverter valve fault; Blocked water path; Motor issue.

Can I safely fix E04 myself?

Some basic external checks may be safe to try first. Stop if there are leaks, burning smells, overheating, electrical issues, unusual noises or repeated failures.

When should I call a professional for E04?

If standard user maintenance does not clear the error, or if you suspect an electrical component failure.

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