Bosch Dishwasher Diagnostic Mode: A Step-by-Step Guide for Efficient Troubleshooting

When your Bosch dishwasher starts acting up and displaying error codes, it can be quite frustrating. However, before you call a technician, there’s a way to diagnose the issue yourself using the Bosch dishwasher diagnostic mode. In this article, we will guide you through the step-by-step process of accessing the diagnostic mode and interpreting the error codes. By the end, you’ll have a better understanding of your dishwasher’s problems and possibly even fix them on your own.

Understanding the Bosch Dishwasher Diagnostic Mode

The Bosch dishwasher diagnostic mode is a feature integrated into certain models, allowing users to access detailed information about the dishwasher’s systems and troubleshoot potential problems. It provides a more in-depth analysis than regular error codes, making it an invaluable tool for users who wish to understand the dishwasher’s health better.

When Should You Use It?

You should consider using the Bosch dishwasher diagnostic mode when you encounter recurring issues or puzzling error codes. This mode is especially helpful if your dishwasher has been behaving unusually or displaying multiple errors, giving you a comprehensive picture of what might be going wrong.

Accessing the Bosch Dishwasher Diagnostic Mode

  • Step 1: Preparing the Dishwasher
  • Step 2: Accessing the Diagnostic Mode
  • Step 3: Navigating the Diagnostic Menu

Step 1: Preparing the Dishwasher

Before entering the diagnostic mode, ensure that the dishwasher is empty, with no dishes or utensils inside. This prevents any accidental activation of the dishwasher’s components during the diagnostic process.

Step 2: Accessing the Diagnostic Mode

Now, let’s dive into the diagnostic mode. Please follow these steps:

  1. Close the dishwasher door and make sure it’s latched securely.
  2. Turn on the dishwasher by pressing the power button.

Step 3: Navigating the Diagnostic Menu

After turning on the dishwasher, follow these steps to enter the diagnostic menu:

  1. Press the “Power Scrub Plus” and “Regular Wash” buttons simultaneously.
  2. Hold the buttons for approximately three seconds and then release.

The dishwasher should now enter the diagnostic mode, indicated by all the LEDs on the control panel lighting up.

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Interpreting Error Codes in Diagnostic Mode

  • Common Error Codes and Their Meanings
  • How to Troubleshoot Specific Error Codes

Common Error Codes and Their Meanings

Once you are in the diagnostic mode, you may encounter error codes displayed as a combination of flashing lights. Refer to your dishwasher’s manual to interpret these codes accurately. However, some common error codes and their meanings include:

  • E01: Heating element issues
  • E02: Temperature sensor problem
  • E03: Water flow problems
  • E04: Water level too low
  • E05: Door lock issues

How to Troubleshoot Specific Error Codes?

Based on the error codes you receive, you can try some basic troubleshooting steps. For example, for error code E01, you can check the heating element for damage or check the wiring for any loose connections.

Resetting the Dishwasher after Diagnostic Mode

  • Step 1: Exiting the Diagnostic Mode
  • Step 2: Power Cycling the Dishwasher

Step 1: Exiting the Diagnostic Mode

To exit the diagnostic mode, press the “Power Scrub Plus” and “Regular Wash” buttons simultaneously once again. This should take you back to the regular operation mode.

Step 2: Power Cycling the Dishwasher

After exiting the diagnostic mode, it’s a good idea to power cycle the dishwasher. Turn it off for about a minute and then turn it back on. This helps reset any temporary glitches that might have occurred during the diagnostic process.

Benefits of Using the Bosch Dishwasher Diagnostic Mode

  • Cost Savings
  • Quick Identification of Issues
  • Enhanced Dishwasher Maintenance

Cost Savings

By diagnosing the issue yourself, you can potentially avoid unnecessary service calls and save money on technician fees.

Quick Identification of Issues

The diagnostic mode offers a detailed view of your dishwasher’s systems, allowing you to quickly identify and understand any underlying problems.

Enhanced Dishwasher Maintenance

Regularly using the diagnostic mode can contribute to better dishwasher maintenance, ensuring it operates optimally for years to come.

Preventive Measures for a Well-Maintained Bosch Dishwasher

  • Regular Cleaning and Maintenance
  • Using the Right Detergent
  • Loading the Dishwasher Correctly

Regular Cleaning and Maintenance

Keeping your dishwasher clean, including filters and spray arms, can prevent clogs and other issues.

Using the Right Detergent

Using the recommended dishwasher detergent ensures proper cleaning and avoids residue buildup.

Loading the Dishwasher Correctly

Properly loading the dishwasher prevents dishes from blocking spray arms and ensures even cleaning.

Common Bosch Dishwasher Problems and Solutions

  • Dishwasher Not Draining
  • Dishwasher Leaking
  • Strange Noises During Operation

Dishwasher Not Draining

If your dishwasher doesn’t drain properly, check the drain hose for clogs or kinks and ensure the garbage disposal’s knockout plug is removed.

Dishwasher Leaking

Inspect the door gasket and door hinges for any damage and check the float switch for proper operation to address leaks.

Strange Noises During Operation

Unusual noises may result from debris in the pump, malfunctioning spray arms, or loose dishwasher components. Inspect and address these issues promptly.

When to Seek Professional Help

  • Complex Error Codes
  • Persistent Issues
  • Component Replacements

Complex Error Codes

If the diagnostic mode displays complex error codes or if you’re unsure about the issue, it’s best to consult a professional technician.

Persistent Issues

If you’ve tried troubleshooting but the problem persists, it’s time to seek professional assistance to avoid further damage.

Component Replacements

For issues involving component replacements, a qualified technician can ensure the correct parts are installed and minimize the risk of further complications.

Can I access the Bosch dishwasher diagnostic mode on all models?

The diagnostic mode is available on select Bosch dishwasher models. Refer to your user manual to determine if your model supports it.

How often should I use the diagnostic mode?

Use the diagnostic mode whenever you encounter persistent issues or if you wish to perform routine checks on your dishwasher’s health.

Can I repair the dishwasher myself based on the error codes?

While basic troubleshooting is possible, complex issues and component replacements should be left to professionals.

Is using the diagnostic mode safe for the dishwasher?

Yes, using the diagnostic mode is safe, as it’s designed to assist users in identifying and understanding potential problems.

Are error codes universal for all Bosch dishwashers?

Error codes may vary slightly between different Bosch dishwasher models. Always refer to your specific model’s manual for accurate information.


The Bosch dishwasher diagnostic mode is a powerful tool that empowers users to understand and troubleshoot their dishwasher’s issues. By following the steps outlined in this guide, you can confidently diagnose and address common dishwasher problems. Regular use of the diagnostic mode, coupled with proper maintenance, ensures your Bosch dishwasher continues to run efficiently for years to come.

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