Here we study the formation of magnetic Fano resonances using asymmetric trimers consisting of three gold nanodisks. By gradually increasing the asymmetry of the trimer, we observe the emergence of two distinct resonance peaks in the infrared, which are identified as a dolmen-like electric Fano resonance and a magnetic-based Fano coil-type resonance confirmed by simulated polarizations and field distributions. The magnetic Fano resonance was found only in asymmetric trimers showing that this symmetry-break is required to achieve coupling between the otherwise uncoupled bright electric and the dark magnetic dipole modes. Our results quantitatively explain the formation of the two types of Fano resonances and pave the way for tailoring the electric and magnetic response of trimer systems, with applications in fields such as bioanalytics and nonlinear light generation.