Model checking of GRAFCET, an IEC standardized specification language, is typically performed by a translation of GRAFCET into a different (target) formalism. However, analyzing instances of considerable sizes quickly becomes unfeasible due to the state space explosion problem. We propose three techniques to reduce a GRAFCET instance depending on the property to be evaluated, resulting in a smaller state space. These techniques can be employed, even in combination, before transformation into a formalism suitable for model checking.