Bosch Dishwasher E02 Error Code Explained: Meaning, Causes & Fixes

 
Safety First: Disconnect and Prepare
 

• Unplug the dishwasher from the power outlet and turn off the water supply to prevent any accidental damage or electric shock.
• Consult your dishwasher’s manual for any model-specific safety instructions before proceeding.
• Ensure the work area is dry and well-lit so you can inspect components closely.

 
Resetting the Dishwasher
 

• After ensuring safety, leave the unit off for at least 10 minutes to allow internal electronics to reset.
• Plug the dishwasher back in and turn on the water supply.
• Run a short cycle to check if the error clears. Sometimes a reset alone can resolve temporary glitches.

 
Inspecting and Cleaning Internal Components
 

• Remove the lower access panel by unscrewing the necessary fasteners. This will give you access to sensitive parts such as sensors and wiring.
• Carefully examine the area for any signs of moisture, water pooling, or corrosion. Dry out any damp areas completely.
• Clean the filter, drain pump, and any other removable components. Debris and blockages may interfere with sensor readings and cause the error to persist.
• Use a soft brush and a clean cloth to remove any buildup, taking care not to damage any wiring or components.

 
Checking Sensor Connections and Wiring Integrity
 

• Locate the water leak detection sensor within the dishwasher’s base. This sensor is critical in preventing water damage and miscommunication in the control board.
• Inspect all wiring harnesses connected to the sensor for signs of wear, corrosion, or loose connections. Gently tug each connector to ensure they are secure.
• If you notice damaged or corroded connections, clean them using electronic contact cleaner. In instances of severe damage, replacing the affected component may be necessary.
• Also, ensure that any protective covers or seals around the sensor are intact and fit properly without gaps.

 
Testing the Electrical Components
 

• Use a multimeter to measure the continuity and resistance of the wiring connected to the sensor and control board. Compare your readings with the values specified in your service manual.
• If readings are off, consider inspecting the circuit board for any signs of burnt components or damaged solder joints.
• In case you identify faults in the electrical components, replacing them might resolve the error. Ensure you obtain the correct replacement parts by referring to your model’s part number.

 
Reassembling and Running a Full Test Cycle
 

• Once you have completed the cleaning, inspection, and any necessary repairs, reassemble the dishwasher carefully. Ensure that all panels are securely fastened.
• Reconnect the dishwasher to the power outlet and turn the water back on.
• Initiate a full wash cycle while monitoring the machine closely. Verify whether the error recurs during the operation.
• If the error does not appear, the issue has likely been resolved. If it persists, note any additional unusual behavior for further troubleshooting.

 
Seeking Professional Assistance
 

• If after performing the above steps the error still appears, it may indicate a more complex fault that requires professional diagnostic tools.
• Contact an authorized Bosch service technician to further inspect the unit and address potential issues with the control board or internal sensors.
• Keep the repair records and any notes regarding the troubleshooting process to provide the technician with detailed information, expediting the repair.