Bosch Dishwasher: diagnostic mode error

Professional Repair Guide

What is this symptom?

If your Bosch dishwasher displays error codes or behaves unexpectedly in diagnostic mode, it may indicate specific faults. This mode is designed to help identify issues, but errors can disrupt normal operation. Understanding and addressing these codes is essential for restoring functionality.

Urgency: Medium

Important Tips for Bosch Models

  • Bosch diagnostic mode is entered via specific button combinations which vary by model; incorrect use can display codes erroneously.
  • Error code ‘0’ or display showing T:01 may indicate test mode output, not fault.

Possible Causes

Diagnostic mode display of stored fault/error codes indicating specific component/system faults

How to Identify: Entering diagnostic mode shows an error code (e.g., E01, E15, E24 on the display or via illuminated indicator lights during the built‑in test; code corresponds to specific subsystem issues.

Part: Various (control board, sensors, pumps, valves)

DIY Solutions

Exit and Reset Diagnostic Mode

Easy 5-10 minutes
  1. Turn off the dishwasher using the On/Off button or power switch.
  2. Wait 30 seconds and then turn the dishwasher back on.
  3. If available, press the Cancel/Reset button to clear the diagnostic/test mode and stored codes.
⚠️ Safety First: Do not perform internal checks while dishwasher is powered.

Interpret and Respond to Displayed Error Codes

Moderate 10-30 minutes
Tools Needed: Owner’s manual or error code reference list
  1. Enter diagnostic mode using the correct button combination for your model (e.g., holding specific buttons while powering on).
  2. Note the displayed error code or indicator pattern.
  3. Consult Bosch error code references to identify the subsystem associated with the code.
  4. Address the indicated issue (e.g., clean filter for drainage errors).
⚠️ Safety First: Always disconnect power before examining or servicing components.

Professional Repairs

Replace Faulty Control Board

Estimated Cost: $150 - $400 (parts)

Component Repair/Replacement Based on Error Code

Estimated Cost: $50 - $250 per part

When to Call a Professional

Diagnostic mode repeatedly shows serious error codes after DIY checks and resets
Control board or major component faults indicated by error codes
Dishwasher won’t exit diagnostic mode despite proper reset attempts

Preventive Maintenance

  • Regularly clean filters and drain area: Drain-related error codes and test cycle faults
    Frequency: Monthly
  • Run diagnostic mode periodically to check system health: Undetected component wear that leads to errors
    Frequency: Annually

Frequently Asked Questions

Why is my Bosch Dishwasher diagnostic mode error?
This error may indicate stored fault codes pointing to specific component or system failures.
How do I fix Bosch Dishwasher diagnostic mode error myself?
Try exiting diagnostic mode by resetting the dishwasher or interpreting the displayed error codes.
How much does it cost to fix diagnostic mode error?
Professional repairs range from $50 to $400, depending on the parts needed.
When should I call a technician for diagnostic mode error?
Consider professional help if the error persists after DIY solutions or if complex repairs are needed.

References & Sources

Community Analytical Insights

Analysis based on real user discussions from appliance repair communities

Can I Fix This Myself?

75%
DIY Success Rate Difficulty: Either

Common Issues Reported by Users

  • Faulty control board or loose connections
  • Blocked drain pump or filter
  • Malfunctioning door latch or switch

User Suggested Solutions

  1. Inspect and reseat the control board connections. If issues persist, consider replacing the control board. Disconnect power, remove the control board, check for any burnt components, and replace if necessary.

  2. Check and clean the drain pump and filter. Remove any debris or blockages that might prevent the pump from operating correctly. This may involve disassembling parts of the dishwasher to access the pump.

  3. Test and replace the door latch or switch if found faulty. Ensure the door closes properly and the latch engages. If the latch is defective, replace it by removing the screws and disconnecting the wiring harness.

Analysis based on 1 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

  1. Bosch dishwasher - diag mode question

Community Discussions

diag mode shows error code 1

Resoldered control board solder joint issue, normal operation resumed except for diag mode error code 1.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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