Low and high electric field transport in the CdIn2Te4electro‐optical semiconductor were investigated. The conductivity, the carrier concentration, and the mobility were measured versus the temperature using Hall techniques. Nonlinear current‐voltage characteristics in high fields are interpreted in terms of thermal effects, not in terms of space‐charge‐limited currents as usually encountered. The nonreversibility ofI‐Vmeasurements is also discussed, diffusion of species are proposed to explain the change of activation energy of the conductivity.