Error Code E:28

Error Code E:28 Troubleshooting Guide

Error Code: E:28 Appliance Type: Dishwasher Affected Brands: Bosch, Siemens, Neff, Constructa, Gaggenau

Experiencing Error Code E:28 on your Bosch, Siemens, Neff, Constructa, or Gaggenau dishwasher indicates a specific communication or operational failure related to the internal water level sensing system.

This error specifically signals that the calibration of the Aquasensor has failed. The Aquasensor is a critical component, often integrated into the base of the appliance, designed to accurately measure water clarity and level. When this sensor fails its self-check or calibration routine, the dishwasher cannot reliably determine the state of the water, leading to this error code to prevent improper washing or flooding.

Initial Troubleshooting Step: Resetting the Appliance

Before seeking professional service, the first recommended action is to attempt a hard reset of the appliance. This process clears temporary electronic faults or glitches that may have caused the initial calibration failure message.

1. Initiate the Reset: Locate the main power switch or unplug the dishwasher from the wall outlet.
2. Power Interruption Duration: Leave the appliance completely powered down for a minimum of five (5) minutes. This ensures that all residual power drains from the control board capacitors, forcing a complete system reboot upon reconnection.
3. Reapply Power: Plug the unit back in or switch the main power back on.
4. Test Cycle: Attempt to start a short, basic wash cycle to see if the E:28 code reappears.

Consult your specific dishwasher model’s user manual for the precise, model-specific instructions on initiating a hard reset, as some models may require holding down a specific button sequence while plugging the unit in.

Next Steps If the Error Persists

If the E:28 error code immediately reappears after performing the reset, the issue is likely a sustained hardware malfunction within the Aquasensor or its associated wiring/control board connection, requiring specialized attention.

If the error persists after the reset procedure, please contact a qualified appliance technician. A technician will need to access the internal components to test the electrical continuity and functionality of the Aquasensor itself, and potentially diagnose issues with the main control board responsible for processing the sensor data. Do not attempt to dismantle internal components, as this can void warranties and pose electrical hazards.