grohe toilet flush problems

Grohe toilets are known for their efficiency and innovative designs. However, users sometimes face issues with Grohe EAU2 dual flush concealed cisterns. Understanding these problems and knowing how to resolve them is key to maintaining the optimal functionality of your toilet. This article explores two common issues and provides potential solutions.

Issue 1: Ineffective Flushing

One of the most frequent complaints about the Grohe EAU2 is that it requires multiple flushes to remove waste, even when the water level is set to the maximum. Despite a rapid release of water from the cistern, the flushing performance is inadequate.

Potential Causes

  1. Inlet Pipe Positioning: An improperly positioned inlet pipe can restrict water flow from the cistern to the pan. This misalignment might also be causing the unusual spout of water observed during flushing.
  2. Compatibility with Pan Design: The pan design might not be suitable for the cistern’s flushing mechanism. Grohe cisterns are typically designed for syphonic pans, which use a ‘sucking’ action to remove waste, as opposed to compression-based pans.
  3. Narrow U-bend: A narrow u-bend in the toilet pan could be causing the water level to rise during flushing, indicating a potential blockage or design incompatibility.


  1. Adjust the Inlet Pipe: Check and, if necessary, reposition the inlet pipe to ensure optimal water flow into the pan.
  2. Pan Assessment and Replacement: Evaluate the compatibility of the pan with the Grohe cistern. If the pan relies on compression rather than syphonic action, consider replacing it with a model better suited to the cistern’s design.
  3. Seek Professional Advice: If the problem persists, consult a professional plumber for advice, particularly regarding pan selection and installation.

Issue 2: Button Alignment Problem

A second issue concerns the actuation buttons, with the smaller 3L button protruding about 8mm above the larger 6L button, contrary to Grohe’s specification that the buttons should be flush.

Potential Cause

  1. Faulty Button Unit: The misalignment of the buttons could indicate a problem with the button unit itself.


  1. Button Unit Replacement: Replacing the two-button unit may resolve the alignment issue. Ensure that the new unit is compatible with the Grohe EAU2 cistern.
  2. Check for Installation Errors: Before replacing the unit, check for any installation errors that might be causing the misalignment.

General Maintenance Tips

  1. Regular Checks: Regularly inspect your toilet’s flushing mechanism for any signs of wear or malfunction.
  2. Consult Manufacturer Guidelines: Always refer to Grohe’s guidelines for maintenance and troubleshooting.
  3. Professional Assistance: For persistent issues, seek help from a licensed plumber or contact Grohe’s technical support.


Issues with Grohe toilet flush systems, such as ineffective flushing and button alignment problems, can often be resolved by checking the compatibility of the pan, adjusting installation, or replacing faulty components. Understanding the specifics of your toilet’s design and consulting with professionals can ensure that your Grohe toilet continues to operate effectively. Regular maintenance and adherence to manufacturer recommendations are key to preventing and solving such issues.

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