Problems With Grohe EAU2 Dual Flush Concealed Cistern

The Grohe EAU2 dual flush concealed cistern is a popular choice among homeowners for its sleek design and dual flush capabilities. However, like any product, some users have reported issues, both in terms of functionality and design. Let’s explore these problems and the recommended solutions.

Flush Inefficiency:

One of the main issues with this cistern is its inability to remove waste with a single flush, even when set to the maximum level (9L). Despite the water rapidly emptying from the cistern, it may not seem to enter the pan quickly enough. Moreover, some users have noted a peculiar problem where water spurts up from the center of the flush valve during the flushing process.

Grohe tech support has identified potential causes:

1. Inlet Pipe Issues: The inlet pipe from the cistern to the pan might be inserted too far, which restricts the flow of water. This misalignment might also cause the water to spurt upwards, as it can’t exit the cistern fast enough.
2. Pan Design Mismatch: Some pan designs might not be compatible with this cistern. They might not facilitate the rapid inflow of water required for an effective flush.
3. Compression vs. Syphonic Action: The design of some pans relies on compression, which needs a large volume of water hitting the waste to flush it away. In contrast, Grohe suggests that their cisterns work best with syphonic pans that use a “sucking” action to remove waste.

One common solution has been to inspect the flush pipe for alignment issues. Users have reported that refitting it can rectify the problem. Another suggestion is to replace the pan, particularly if the current one has a design that is incompatible with the cistern’s flush mechanism.

Button Design Flaw:

Another issue concerns the design of the actuation buttons. The 3L button (smaller one) tends to protrude about 8mm more than the 6L button. This design anomaly is not just an aesthetic issue, as Grohe indicates both buttons should sit flush.

A potential solution is to replace the two-button unit. Observations suggest that the malfunctioning unit might be responsible for the water spurting during the flush, and replacing it could simultaneously address both problems. Ensure the new button unit has the proper design, where the smaller button should have a notch that fits securely with the larger button.

Conclusion:

The Grohe EAU2 dual flush concealed cistern, while stylish and modern, does come with its set of challenges. When faced with these issues, homeowners are advised to consult with professionals or the manufacturer’s tech support for tailored advice. In most cases, checking alignments, understanding compatibility, and considering replacements can offer effective solutions. As with any installation, ensuring that components are compatible and correctly fitted can prevent a lot of future headaches.