Louis Walsh was seen talking to one of the show's producers during the first sing off between Carolynne Poole and Rylan Clark.
Louis then went on to controversially vote to send Carolynne home, leading to deadlock the subsequent elimination of the country singer.
A spokesperson for The X Factor commented at the time: "Carolynne had the least amount of public votes so the public’s choice to stay in the show was Rylan. Producers always chat to judges during the show."
Ofcom has dismissed all the complaints, saying: "Ofcom judged that this matter did not raise issues under the code as the format of the contest is made transparent.
"Viewers vote in the knowledge that the ultimate decision to eliminate contestants or force a 'deadlock' situation rests with the judges."
The X Factor 2012 continues this Saturday on ITV1 and ITV1HD, with the final five acts sing two tracks each with Abba and Motown themes.
Sunday's results show will see one more act get the axe, and there will be performances from Rhianna, Tulisa and Bruno Mars.