Dyson claimed that both brands sold products which used control electronics to boost their motor wattage, making them appear more competent during EU efficiency tests.
"Their behavior is akin to that seen in the Volkswagen scandal. It seems that industry is rife with manufacturers engineering to find their way around tests, rather than engineering better, more efficient technology. This behavior is seriously misleading customers," British inventor, James Dyson said in October.
Following Dyson's legal proceedings announcement, BSH Hausgerate (BSH)—owner of Bosch and Siemens—announced at the end of October that it was going to initiate legal steps towards Dyson over the "unfounded and untrue" claims made.
In response to the ruling made this week, BSH Group—which was not involved in this proceeding—said it considered the EU label to be "a transparent method for informing consumers and are always guided in full by its binding conditions."
When contacted by CNBC, Dyson declined to comment on the Bosch and Siemens legal proceedings.
—By CNBC's Alexandra Gibbs, follow her on Twitter @AlexGibbsy.