Dual flush toilet doesn't dual flush

Feb 5, 2019
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I have a Grohe dual flush toilet and the flush button looks like this:

I'm assuming that pushing the smaller inner button should trigger a small flush and pressing the larger button should trigger a large flush. But whatever I press, the toilet always flushes the same way. I think it's a big flush but I'm not sure. I measured it and it's about 15 liters each flush.

Any ideas what could be wrong and if it's an easy fix that I could attempt to do myself, or is there no option but to call a plumber?


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